Fire detector thermal linear installation method. Linear fire detectors

When purchasing 5000 m of linear detector IP-104/IPLT ProReact Digital TN

THERMO CABLE_MIP2I module AS A GIFT!

Linear thermal fire detector
SPIP "TERMOCABLE" includes:
Interface firefighter module “THERMO CABLE_ MIP2I” with indication of the exact location of the fire with the function of connecting two loops of the linear heat fire detector IP-104 ProReact Digital TH (hereinafter referred to as the module and/or abbreviation MIP2I).

The firefighter interface module “THERMOCABLE” MIP2I works only with the linear heat fire detector IP-104/IPLT ProReact Digital TN and Thermocable ProReact Digital.

The firefighter interface module “THERMOCABLE” MIP2I is not intended to work together with a linear heat fire detector with a resistance of more than 100Ω/km per conductor.

Main features of the MIP2I module:

Connection of two loops of linear thermal fireman is notified
·Two operating modes: independent and two-threshold
· The independent mode provides independent control over the operation of each linear thermal fire detector connected to MIP2I, which allows you to connect to the device both linear thermal fire detectors with similar characteristics (of the same sensitivity temperature, in the same type of shell) and linear thermal fire detectors with different characteristics .(different sensitivity temperatures and different shells). In this operating mode, if one of the loops catches fire, the device will give a “FIRE” signal and determine the distance to the source of fire.
·The two-threshold mode provides joint control of two zones of a linear thermal fire detector with the ability to issue a preliminary fire signal and a “FIRE” signal. In this mode, the “FIRE” signal is given only when two loops of a linear thermal fire detector connected to MIP2I are triggered simultaneously.

The fire notification system SPIP "TERMOCABLE" is designed to determine the point of fire along the entire length sensitive element(line thermal firefighter is notified) with determination of the exact location of the fire and notification of the fire by filing sound signal, as well as transmitting a text notification about the distance to the fire location in meters on LCD displays.

Advantages of THERMAL CABLE

• Low price in rubles according to a fixed price list.
• Two connection options: One or two loops
• Maximum cable length - 3000 m using interface module
• It is an analogue replacement for all thermal linear fire detectors presented on the Russian market.
• Compatible with any fire alarm panel.
• Guaranteed sensitivity along the entire cable length.
• Minimum bending radius reduced to 50 mm
• Sensitivity range from +68, +78, +88,+105,+185 degrees C
• Sheath: PVC, nylon, polypropylene and steel braid.
• Used in environments with aggressive factors.
• UV protection for outdoor use
• Defence from mechanical damage
• Noise protection
• Increased level of chemical protection and protection in alkaline environments

System composition

Interface firefighter module “THERMO CABLE_ MIP2I” with indication of the exact location of the fire with the function of connecting two loops of the linear heat fire detector IP-104 ProReact Digital TH (hereinafter referred to as the module and/or abbreviation MIP2I).

Supports MODBUS protocol

LCD display with indication

There are two options for connecting a linear heat fire detector: directly to the MIP2I and connecting via a leading-connecting cable, which allows you to reduce the number of linear heat fire detectors, as well as install the MIP2I in any place convenient for the user. The connecting cable is calibrated automatically when the system is first installed.
Line heat fire fault control is notified.
Possibility of connecting one line of a linear heat fire detector.

Linear thermal fire detector IP-104/IPLT ProReact Digital TN

The length of one train is up to 3000 m

Operation temperature: +68С, +78С, +88С, +105С, +185С

Sheaths: PVC, Nylon (for outdoor use, resistant to aggressive environments), polypropylene (resistant to aggressive environments), steel braid (protects the linear thermal fire detector from mechanical damage)
Outdoor applications
Resistant to aggressive environments
Resistant to mechanical damage
Maintenance free
Long service life up to 25 years

Mounting box TN-1000

Specifications

Application area

A typical solution for using thermal cables is premises with a large area or length, as well as hard-to-reach areas that require 100% coverage and protection, extended areas, areas with an aggressive environment. The heat detector is resistant to dust, humidity, chemical reagents, high and low temperatures, can be used in explosive areas, is easy to install, and does not require maintenance. Service life - at least 30 years.

Connection diagram

There are many types of devices for early detection fire sources that are part of fire alarm installations/systems, which, in turn, are elements. Various fire detectors are also integral parts of gas, water, powder detectors, without which operation today is impossible as production facilities, and public buildings.

In the vast majority of cases, point PIs are used, which determine the appearance of factors that cause a fire in a controlled area limited by its own technical characteristics, usually in the shape of a circle or sector. However, in many industrial, warehouse, and public buildings/structures that have a large height, width, and length, they are not applicable, because this excludes their capabilities and limitations on use.

In such cases, to protect objects, specialists from design organizations provide for the use of linear PIs, which can detect the appearance of heat and smoke in a straight section/area of ​​the room, even over a considerable length.

Devices that are very similar in purpose, only to protect the property of citizens/organizations from theft, are linear security detectors designed to monitor unauthorized crossing of the perimeter, the active detection zone.

Types of linear fire detectors

To them on the basis of the definition that establishes the design standards of APS, ASPT; It sounds like a linear fire detector (smoke, heat) is an IP that responds to signs of fire in an extended protected area, there are two types of such technical devices:

• Linear smoke detector (IPDL) is a product that transmits an IR beam through a device/sensor that is sensitive to the transparency of the air in a protected room/building. If smoke exceeds the set threshold value, the optical detector will trigger, transmitting an alarm signal to receiving equipment APS installations, ASPT control and starting devices. In many ways, it is precisely due to the thin, straight line of the IR beam and the location of the transceiver devices exactly on the same axis that such types are called linear IP.

• In addition, they are divided into two types - two- or one-component systems. The first is the traditional layout of the product, consisting of two devices: transmitting a continuous optical signal, and receiving it on the opposite side of the room. The second is when the transmitting and receiving parts are made in a single housing, and the transmitted IR beam is directed to a passive reflector/reflector, precisely fixed in place opposite the device. Such linear detectors with reflector are more modern devices, requiring lower costs for laying substation cables and configuring products.

• Heat detector linear (IPLT) also has several varieties depending on the type of temperature-sensitive cable used in this product. They can be contact, electronic, mechanical or optical, and for all of them the main purpose is to fix a threshold or differential increase in temperature along the entire length of the thermal cable. It is worth considering them separately.
• Contact. In them, the temperature-sensitive elements consist of several conductors in fusible insulation.
• Electronic. They are based on changes in electric current under the influence of heat. Here, thermoelements are many sensors as part of a multi-core cable.
• Mechanical. The sensitive element is a metal tube filled with compressed gas, the pressure of which increases as the external temperature rises, which is detected by the sensor of the electronic unit, which transmits a signal to the device.
• Optical. They use fiber optic cable, the physical characteristics of which also change when heated.

For more information on the topic, watch the video

Among the line of models of linear heat and smoke IP products, many manufacturing companies have products designed to protect premises in buildings/structures with high temperatures.

Many specialists from design organizations, fire departments, and installation companies believe that linear individual entrepreneurs can be classified as linear; because, although their active zone for detecting fire origin factors is sectoral, the main indicator is the detection range, which for some models is up to 80 m, and this is comparable to the technical characteristics of smoke linear IP.

Pros and cons of linear detectors

The main advantage of linear IP is the ability to protect with them those objects where the use of point detectors is difficult, if not impossible, due to design features buildings/structures, technological process, specific installation locations in the premises:

• Smoke. Installation in buildings with large construction volumes, internal, undivided spaces, such as assembly and other workshops of various production facilities at industrial facilities, warehouse complexes, logistics centers, exhibition, sports facilities, as well as museum institutions, architectural monuments, where the installation of traditional heat, smoke IP on ceilings various reasons impossible or unacceptable. In addition, IPDLs are more sensitive to black smoke and have a high response rate to the appearance of pyrolysis products in the air.
• Thermal. IPLT can be installed where installation of point analogues is impossible - in technological galleries, cable tunnels, ventilation ducts, etc. engineering communications buildings/structures, in other areas difficult to access/maintain regularly; as well as to protect various equipment, even if the surrounding air environment is characterized by constant high levels of dust, gas contamination, humidity, and chemical aggressiveness.
• Flame sensors installed for protection technological equipment, located on the outdoor areas of industrial enterprises, incl. for work in tough climatic conditions.

The disadvantages of linear detectors include the high cost of the kit, which, however, pays off due to the fact that one product replaces several, or even more than a dozen smoke and heat IPs based on the protected area of ​​the room.

Types of linear detectors

Among the products sold today on the market of components for alarm systems, the following models should be highlighted, characterized by good technical characteristics, reliability, ease of maintenance, and maintainability:

• IP-104/IPLT from the FlameStop company (Moscow) with a possible length of up to 3 (!) km. Temperature response range from + 68 to 185℃. Thermal cable is a twisted pair with a steel core coated with copper and tin. The main shell is PVC, protective for various modifications - nylon (for outdoor installation, aggressive environments), polypropylene (for chemically active areas), in steel braiding - for protection from damage. Resistant to external temperatures up to + 125℃. Diameter – from 3.6 to 4.5 mm depending on the outer shell. Weight – up to 20 kg/1 km. Protected from electromagnetic interference.
• IP-104 “Granat - thermal cable” produced by the Spetspribor company (Kazan). The maximum length of use is up to 2 km. Operation temperature – from 68 to 180℃. The maximum width of the protection zone is up to 7.6 m, the recommended width is up to 5 m. Outside diameter– 5 mm.
• IPLT XCR from Pozhtekhnika Group of Companies (Moscow). The used length of the IP is up to 1220 m. The outer diameter is 4 mm. The outer shell is made of fluoropolymer, resistant to aggressive chemical environments.
• Thermal cable PHSC-155-ECP from Protectowire. The length of the plume is up to 2 km. Diameter – 4 mm.
• IPDL D/II-4R. The most common fire detector of this type, produced for more than two decades by NPF Poliservis from St. Petersburg, consisting of two blocks - an IR transmitter and a receiver. Range – up to 150 m. Protection – IP
• IPDL-52M produced by IVS-Spetsavtomatika. A single-component linear detector, which includes a transceiver unit made in one housing and a reflector. Range – up to 80 m, width of the protection zone – up to 9 m.
• IP 212 "Trion-L2-MK" of the "SMD Company" is intended for the protection of explosion- and fire-hazardous premises. Controlled area – up to 900 sq. m. Protection – IP
• IP 212-125 (6500R) from the SensorSystem company. Single-component device of a new generation. Operating range – up to 70 m. Protection – IP
• Arton-DL. Linear single-component smoke IP with a range of up to 100 m.
• IPDL-EX. Manufacturer: NVP "Bolid". Two-component device intended for installation in hazardous areas. The range of this linear detector is up to 150 m.

In addition to these models/brands on the market fire fighting equipment many more presented various products, therefore for optimal choice it is necessary to proceed from the characteristics of the premises of buildings/structures, external installations/equipment, upcoming conditions of installation, operation and further maintenance.

Linear fire detectors: thermal, gas, combined

Rules for installation and indoor installation

The standards for installing linear power supplies are set out in SP 5.13130.2009, in particular with regard to IPDL:

• Detectors must be placed in such a way that there are no different objects between the devices, even temporarily.
• Installation of linear fire detectors in a room with a height of more than 12 m should be carried out in two tiers.
• Installation of IPDL when protecting an area/room with two or more products should be carried out so that the distance between them is no more than 9 m, and from the wall - no more than 4.5 m.

The designation of a linear fire detector depends on the type of IP - thermal, smoke, flame.

Laboratory studies have established that linear detectors are significantly superior in sensitivity and response speed to both thermal and smoke traditional detectors.

As a rule, this does not at all mean the preference for choosing IPLT/IPDL instead of targeted IP. Each type has its own tasks, determined both by technical characteristics and the upcoming installation, operation and maintenance sites, which is always taken into account when developing design and estimate documentation, including the cost of various products.

In practice, large facilities use several types of fire detectors, both point and linear, which is facilitated by the possibility of connecting them to the same control and control devices, for example, produced by the Bolid company.

In view of the increase in production using expensive equipment and the increase in the number of technological personnel at enterprises, it is often necessary to take care of the safety of people and technological equipment. Currently, due to the tightening of rules for the design of security systems, it is often necessary to think about the use of one or another type of system.

This article will discuss an innovative solution in the field of providing fire safety- a device presented in the form of a cable.

A linear fire detector, another name for a thermal cable, is a device capable of detecting changes in temperature in the area in which it is laid, in cases where it is impossible to install other types of fire detectors.

A linear fire detector is a pair of conductors insulated with heat-sensitive insulation and encased in an additional protective insulating layer.

Operating principle.

The principle of operation is as follows: when a fire occurs or overheating occurs in the area where the thermal cable is used, the insulating layer of each conductor is damaged under the influence of a threshold temperature, and the conductors are short-circuited in a separate or several areas. Control device makes a decision to change the state at the control object.

Classification of thermal cables according to the types of external insulation used,

which significantly influences the use of the detector in specific conditions environment:

• Thermal cable type EPC, the insulation of which is considered the most universal insulation made of PVC material, which allows it to be used in industrial and civil construction. The sheath provides good flexibility when laying the cable when low temperatures. This ensures proper fire and moisture resistance.
• The EPR type thermal cable has a polypropylene outer sheath that significantly increases fire resistance and does not affect the influence of ultraviolet radiation from the environment. Typically used in environments with aggressive chemicals, not subject to abrasion. At the same time, it functions reliably in conditions of elevated ambient temperatures.
• Thermal cable type XLT, the insulation of which is an insulating material made of polymer, highly capable of withstanding extremely low temperatures. The main purpose of this type of insulation is to use the detector in open areas, in the conditions of the Far North, in refrigeration and freezers.
• The thermal cable of the TRI type has similar properties to the insulation of the EPC type, but the only unique difference from other cables is the TRI cable (TRI-Wire) is capable of producing two signals, “Pre-alarm” and “Fire,” depending on the installation.
• The XCR type thermal cable literally includes all of the above types of sheaths. High quality fluoropolymer shell specifically designed for objects special purpose, with reduced smoke emission and gas formation, mechanically resistant to abrasion, with high resistance to low temperatures. Just like the EPR shell, it withstands the aggressive effects of chemically active substances and ultraviolet exposure. And the possibility of use at low temperatures makes it similar to the XLT type detector. The quality of the shell allows us to emphasize the versatility of the insulation material used.

Classification of thermal cables according to operating conditions

Let's look at the following figure below, which will clearly demonstrate the ability to use this or that insulation in different conditions environment.

Classification of thermal cables according to temperature conditions.

In the figure you can see the cable model and the corresponding response temperature, in the operating temperature range.

The advantage of using a linear fire detector:

Thermal cable has increased sensitivity to temperature changes along its entire length;

The presence of several temperature operating conditions, due to the manufacture of devices of various types of manufacture;

Resistance to ambient environmental conditions;

High resistance to low ambient temperatures;

Low cost and simple solutions for system installation, reduced operating costs.

Principles of system construction:

The operation is based on the principle of working with normally open contacts, therefore the monitoring device must have the feature of monitoring the closure of the communication loop$

It is necessary to take into account that when choosing this detector, it is necessary to take into account its internal resistance, due to the length of the thermal cable, 1 Ohm per 1.5 m, which may subsequently affect the length of the thermal cable line in a given area;

When choosing this system in a protected area, you should be guided by the calculation of the possible resistance of the thermal cable and evenly distribute the total length in the area into several equal sections, otherwise a cable section longer than 2000 m may lead to false operation of the system;

Installation must be carried out in one piece, avoiding branches, and divided into zones, which are determined by determining the source of the fire in a particular place;

When planning cable installation, take into account the standards and requirements for cable installation.

Next, we will consider mounting devices that are used in systems security and fire alarm system using a linear fire detector based on equipment supplied by Protectowire, approved by VNIIPO EMERCOM of Russia.

Mounting components.

Zone box ZB-4-QC-MP hermetically sealed connection between the linear detector and the communication loop. The design of the box allows for reliable protection of the connecting unit from external environmental influences and helps ensure high-quality connections over a wide range of operating temperatures.

The application example discussed below in the figure shows that the contact connectors enclosed inside the box, when used in this way, make it possible to adequately ensure the connection of the thermal cable and the communication cable, as well as additional resistance, ensuring its integrity.

Crimp coupling SR-502

its main purpose is to ensure sealing of the cable entry into the ZB-4-QC-MP zone mounting box. Stacked coupling made of steel elements and o-rings, allows you to obtain a reliable sealed connection with the cable and the box, without damaging the heat-sensitive sheath of the cable cores.

Fastening devices.

Designed for fast, reliable and at the same time safe installation mounting elements allow you to gradually secure the cable during the pulling process, while ensuring the integrity of the thermal cable.

The fastening elements presented below allow installation without additional stretching and squeezing of the cable insulation.

WAW clamp

the appearance of the device allows you to guarantee simple and reliable fastening detector cable to the surfaces on which it will be laid. The principle of use is that a cable is placed inside the clamp, the material of which, depending on the laying conditions, can be of two types, and it is clamped without pressure on the outer shell.

According to the type of material used, the clamp can be of two types: nylon (WAW-N) and polypropylene (WAW-P). Polypropylene clamps are suitable for use in high-temperature environments, and nylon clamps are suitable for low-temperature environments up to -40°C, and +88°C, respectively, for polypropylene.

There are no installation features on straight sections, but in the corners there is a displacement of the fastener installation point inside the cable bend by 1.3-2 cm from the intersection of the cable lines, after fastening on straight sections.

Also for straight sections, more primitive OHS type fastenings are also applicable.

OHS Line Clamps

are used to mount a linear fire detector in straight sections, as recommended by the manufacturer, between WAW type clamps, while providing basic support for the detector.

The OHS-1 type clamp is made of galvanized steel, which justifies its use for indoor use, and the OHS-1/4-SS type clamp is made of steel, which justifies its use for outdoor use.

The clamp is fixed using essentially any fastener (bolt, screw, pin, etc.).

The mounting fasteners considered make it possible to mount the thermal cable on a plane, but as a rule, when installation work It is not always possible to carry out work only on a plane, or it is not possible to install a clamp on it; in some places it is necessary to suspend the detector from building structures, where it is not possible to mount it for one reason or another, using the previously discussed methods, they resort to the use of clamps, which, without additional disruption construction integrity will allow cable laying.

BC Series Clamp Kit

are used for laying the detector to building structures, without violating its integrity, and reasonable use of labor costs and installation time. They are used when installing thermal cables on cable runs organized in trays, on metal structures, half-timbered structural elements, etc.

The principle of fastening is that a BC type clamp is attached to the structure, and the thermal cable is attached to it through a WAW type clamp.

Depending on where the clamp is used, there are two types of clamps.

Clamp BC-2, material steel, is used for laying thermal cables indoors.

Clamp BC-3, galvanized steel, is used for installing thermal cables on external structures.

Adhesive type installation kit

in cases where it is not permissible to perform mechanical fastening, and temperature conditions and environmental conditions allow, without special requirements for the material, the use of fasteners consisting of an installation platform and a cable tie, which is glued to a specialized industrial glue, which ensures speed of installation and ease of work.

To ensure displacement of the thermal cable relative to the attachment point, use RMC L Mounting Bracket. The L-shaped holder, at the end of which the WAW clamp or push-button latch has five holes to adjust the offset distance. Just like all the previously discussed fastening elements, this holder is made of either sheet steel or stainless steel, which ensures its ability to be used both indoors and outdoors.

CC-2 mounting clamps.

They are a composite system of fastening elements that allows you to quickly and conveniently install a linear fire detector along a cable tray with direct attachment to the tray. A typical “Caddy” clamp has a specific bend on one of the edges, which allows it to catch on the edge of the cable tray and securely hold it when hanging a thermal cable secured with a snap-on fastener or a WAW-type clamp on the other edge.

For these purposes, the manufacturer produces two modifications of clamps for a tray with a thickness of 1.6-4.0 mm and a tray with a thickness of 4.0-6.0 mm, models CC-2N and CC-2W, respectively.

When using another "Caddy" type clamp, it is possible to attach in the same way to thicker elements of the cable tray.

CC-10 mounting clamps.

Similar in principle to clamps type CC-2. In addition to everything previously said, this type of clamp has the possibility of additional mechanical impact for attaching the clamp to the tray when using a bolted connection, in which case the clamp is recommended for installing a linear fire detector in places subject to vibration.

Fastener modifications are presented in two types:

CC-10N are used for trays with a wall thickness of 3.2 - 6.4 mm;

CC-10W are used for trays with a wall thickness of 7.9 - 12.7 mm.

A less complex, but also functional method of attaching a thermal cable may be possible if such products are available.

Mounting clamp HPC-2.

Resistant to UV radiation of the environment and having a bracket that allows you to engage the fastening lock to a material with a thickness of 1.5 - 6.4 mm, this clamp will allow you to install a linear fire detector without additional labor costs. The thermal cable is inserted into a clamp, which is attached to the structure appropriate for its purpose. Material - nylon.

Same simple method fastening, it is possible to install a thermal cable using clamps.

Clamps PM-3.

When laying a linear fire detector along fire sprinkler systems, it was necessary to solve the problem of suspending a thermal cable to a pipe line, for which such hotouts were introduced.

The clamp-in-clamp system allows you to use one clamp to secure the fastening element, and the second one attracts the thermal cable, while there is no contact of the detector with the pipe, and most importantly, the place where the cable is crimped is not overtightened, and the internal insulating layer of the cores is not damaged.

Nylon clamps are used at temperatures from -40 °C to +85 °C, and the installation temperature should not be below 0 °C.

All of the above in one way or another relates to one installation method. Next, we will consider the method of laying on a string when using a supporting cable.

Nexisting tros.

An exclusive way of delivering a linear fire detector is that the support cable is already integrated into the detector. Stainless steel threads are located directly under one outer braid. The cable wraps around the threads with a period of 0.3 m. The cores give the cable additional rigidity, which will allow it to be used in places where it is not possible to make fastenings in the usual way.

The installation method is extremely clear; it consists in the fact that the ends on the straight section of the fire detector are attached to fixed parts or lugs and tension is applied using a lanyard.

The length of such a section should not exceed 76 m, otherwise the cable may break.

Also, to prevent thermal cable breakage, supporting elements are installed throughout the area of ​​use of the linear fire detector. The frequency of use of such elements is determined by the operating conditions, which practice shows that when used outdoors, it is recommended to use the element more often in order to provide support and load distribution, from ice, snow load over the entire length of the thermal cable.

Main areas of application of thermal cable

The PHSC thermal cable is intended for use in facilities of large length and area, tunnels, and in places where the use of traditional fire detection means is difficult. It is a fire heat detector that allows you to determine the distance to the point of its activation with an accuracy of up to a meter.

PHSC thermal cable has found wide application in the oil and gas industry, chemical production and metallurgy. Significant feature thermal cable produced by Protectowire (Pozhtekhnika - official Russian distributor) are its operating conditions: the PHSC linear heat detector can be used in areas of high pollution, humidity, exposure chemical substances, low temperature, thermal cable can be laid in close proximity to equipment requiring fire protection/ temperature control.

Typical objects where thermal cables are used: cable routes, tunnels, subways, aircraft hangars, conveyor belts, elevators, transformer substations, electrical equipment, large-area storage facilities, liquid fuel storage facilities, refrigerated storage facilities, cooling towers of nuclear power plants and thermal power plants, piers, covered bridges, garages, storage tanks.

Standards for laying thermal cables according to NPB 88-2001

• Linear heat detector - the thermal cable must be laid in direct contact with the fire load.
• The thermal cable can be installed under the ceiling above the fire load in accordance with the regulations for the placement of heat detectors. See table below.

• Priority should be given to the technical specifications specified by the manufacturer.
• The distance from the thermal cable to the ceiling must be at least 15 millimeters.
• When used on racks, laying along the upper tiers is allowed.

Detailed description of Protectowire PHSC thermal cable

A linear heat detector (thermal cable) manufactured by Protectowire (USA) is a cable that allows you to detect a source of overheating anywhere along its entire length. The thermal cable is a single sensor continuous action and is used in cases where operating conditions do not allow the installation and use of conventional sensors, and in conditions of increased explosion hazard, the use of a thermal cable is optimal solution. The Protectowire Linear Heat Detector consists of two steel conductors, each coated with a heat-sensitive polymer. Insulating-coated conductors are twisted to create mechanical stress between them. On the outside, the conductors are covered with a protective sheath and braided to protect them from exposure to adverse environmental conditions. The principle of operation of a thermal cable is based on the destruction of the insulating coating made of a heat-sensitive polymer under the influence of pressure from the conductors when a threshold value of the ambient temperature is reached. In this case, the conductors are closed to each other. This can occur at any hot spot along the entire length of the thermal cable. To trigger the cable, you do not need to wait for a section of a certain length to heat up. The Protectowire thermal cable allows you to generate an alarm when a temperature threshold is reached at any point along the entire length of the thermal cable.
Structure of the Protectowire PHSC series thermal cable

Currently, there are five types of Protectowire thermal cables, differing from each other in the model type and the material of the outer protective sheath, which allows the thermal cable to be used under different environmental conditions.

EPC- EPC type thermal cable has a durable extruded outer protective PVC sheath, providing reliable protection cable under various environmental conditions. The thermal cable of this series is universal and well suited for both industrial and commercial use. The thermal cable sheath is fire and moisture resistant and
Retains good flexibility when used at low temperatures.

EPR - EPR type thermal cable has a durable, fire-resistant outer sheath made of polypropylene, resistant to ultraviolet radiation. Created for wide application in industry and is characterized by high elasticity, resistance to chemically aggressive environments, abrasion, exposure to atmospheric conditions and reliable operation under high temperatures ah environment.

XLT- XLT type thermal cable has a polymer outer sheath and was specially designed for use in extreme conditions low temperatures. This sheath allows the use of this cable in refrigerated warehouses, commercial freezers, unheated warehouses, as well as in the harsh climatic conditions of the North.

TRI- thermal cable type TRI (TRI-Wire™) is a unique linear heat detector that allows you to receive two alarm signals (“Pre-alarm” and “Fire”) depending on the set temperature thresholds. The thermal cable is enclosed in a PVC sheath and has characteristics similar to the EPC series.

XCR- a new product on the Russian market. The XCR series thermal cable is encased in a high quality fluoropolymer outer sheath. This type of detector was specially developed for objects that require the use of reliable, high-tech and environmentally friendly equipment to protect them. The main feature of the XCR series thermal cable is a fluoropolymer fire-resistant sheath, with reduced smoke and gas emission, providing the highest mechanical abrasion strength over a wide temperature range. The shell also provides protection to the heat-sensitive polymer from a wide variety of acids, alkalis, organic solvents and simple gases. In addition, the shell is resistant to sunlight(including UV radiation), as well as various weather conditions.

This type of thermal cable can be used at extremely low temperatures and demonstrates the best performance in comparison with other types.

Advantages of using Protectowire thermal cable:

• High sensitivity throughout the detector.
• Five different temperature ranges.
• High resistance to humidity, dust and chemicals.
• Indispensable when used in low temperature conditions.
• Simplicity and ease of installation.
• No operating costs (no maintenance required).
• Service life more than 25 years.
• The entire range of Protectowire thermal cables used has a fire safety certificate of the Russian Federation, as well as FM and UL certificates.

Electromechanical characteristics of Protectowire thermal cable.

Resistance* ~ 0.656 Ohm/m
Capacitance* ~ 98.4 pF/m
Inductance* ~ 8.2 µH/m
Electrical insulation strength = 500V (AC), 750V (DC)
Maximum operating voltage = 40V (DC)
Cable outer diameter (EPC, EPR, XLT, XCR) ~ 4mm
Cable outer diameter (TRI) ~ 4.5mm
* - Electrical characteristics indicated for twisted pair conductor

Temperature conditions of PHSC thermal cable

Classification of PHSC thermal cables according to temperature conditions work

Optical thermal cable Protectowire

Currently, shutdowns of data processing systems of complex technological processes caused by overheating and fires cause enormous losses to the economy of enterprises and lead to a significant loss of recovery time. To prevent such situations, the occurrence of fires and local overheating must be determined at an early stage and as soon as possible. That's why Protectowire linear heat detectors are the primary detection system for many industrial plants.

Protectowire is a leader in linear temperature rise detection technology. Thousands of similar systems are installed around the world.

The new FiberSystem 4000 product uses the most advanced technology in the field of fiber optic temperature measurement technology. The system includes unique components and shows results unattainable by competitors in this field.

Principle of operation

The FiberSystem 4000 measures temperatures using a fiber optic that functions as a line detector. The temperature recorded along the entire optical cable represents a continuous profile of values. This guarantees high accuracy determining temperature differences over large distances and surfaces in the shortest time intervals.

The FiberSystem 4000 temperature measurement principle is based on back-Raman scattering. An optical thermal cable is a light guide cable that is sensitive to heat and light radiation. Using the signal conditioning unit, the temperature values ​​in the thermal cable fiber can be determined for specific points.

In addition to radiant scattering, additional light scattering (Raman scattering) occurs in the fiberglass material when exposed to heat. Temperature changes induce lattice vibrations in the molecular complex of quartz glass. If light falls on these thermally excited vibrations of molecules, then the interaction of particles of light (photons) and electrons of the molecules occurs. Temperature-dependent light scattering occurs in the light guide, which, relative to the incident light, is spectrally shifted by the resonant frequency of the grating vibration.

Backscatter contains three different spectral components:

Rayleigh scattering (optical scattering of light on molecules that occurs without changing the wavelength) with the wavelength of the laser source used;
. higher wavelength Stokes components;
. anti-Stokes components with lower wavelength.

The intensity of the anti-Stokes group depends on temperature, while the Stokes group is almost independent of it. The local temperature measurement at any location in the fiber is calculated from the ratio of the intensity of the anti-Stokes and Stokes components. A special feature of the Raman effect is the direct measurement of temperature using the Kelvin scale.

Using a semiconductor laser and a new evaluation method, the FiberSystem 4000 controller is capable of processing scattering effects (Rayleigh and Raman) along 4 km of optical thermal cable and reliably indicating temperature changes within 1-2°C per minute.

Protectowire FiberSystem 4000. Optical thermal cable PFS series

Distinctive features of PFS series optical thermal cables:

two cable models for different operating conditions;

reliable protection against electromagnetic radiation;

ability to work in difficult operating conditions;

does not require maintenance;

fire-resistant protective shell;

programmable response temperature.

The optical thermal cable measures temperature readings through an optical fiber that functions as a linear heat detector. The ambient temperature is controlled along the entire length of the optical thermal cable, which guarantees accurate measurements over large distances and areas. The optical thermal cable consists of a stainless steel or polyamide tube with an outer diameter of 1.2-1.8 mm. The tube, filled with a special gel, contains two independent quartz fibers with color markings. This design ensures that the cable fibers always remain waterproof. Depending on the model of the optical thermal cable, the tube is covered with braided stainless steel or aramid fiber (Kevlar®). On the outside, the optical thermal cable is enclosed in black
fire-resistant plastic protective shell. The outer diameter of the optical thermal cable is 4mm.

Optical thermal cable Protectowire PFS series

Application:

Tunnels
. Cable routes and trays
. Conveyor belts
. Distribution boards
. Transformer
. Cooling towers (cooling towers)
. Mines
. Pipelines
. Bridges, piers, sea ​​vessels
. Aircraft hangars

Currently, optical thermal cables are widely used in various industries and production. The unique features of the optical thermal cable also allow it to be used for monitoring power cables, icing road surface, leaks in pipelines, etc.

In the field of fire detection, fiber optic technology is ideal for industry as well as many types of commercial applications. The Protectowire PFS Series optical thermal cable offers unique advantages over other types of sensors, especially when used in hard-to-reach areas or harsh environmental conditions. When using an optical thermal cable with the Protectowire FiberSystem 4000 OTS controller, periodic measurements are taken, which allows you to get a dynamic picture of temperature changes.

Benefits of use

When used in conjunction with an OTS controller and unique visualization software, the cable identifies and locates alarms anywhere along the cable's length.
. Unique ability to divide into zones. The total cable length can be divided into 128 zones for accounting different requirements(video surveillance, ventilation, fire extinguishing, etc.).

Different alarm conditions by zone. An alarm can be triggered based on the maximum temperature for each zone, the increase in temperature over time, or the temperature difference between the measurement point and the average temperature in the zone.
. Stainless steel or aramid fiber braiding and a fire-resistant outer shell provide reliable protection against mechanical damage.
. Convenience and ease of installation. When using the necessary tools, connecting cable sections is allowed. Connections can be made without losing the technical characteristics of the system.

PFS Thermal Cable Specification

The PFS product series consists of two various types optical thermal cable. Each of the two cable types has a unique structure that allows the detectors to be used under different installation, operating and environmental conditions.

PFS-504-FR- The base of the FR cable consists of a stainless steel tube, which contains two independent quartz fibers with a diameter of 0.25 mm and color-coded. The tube is filled with a waterproof, thermally conductive compound to protect the fibers from moisture. Steel tube covered with stainless steel braid for high temperature protection and reinforcement mechanical strength cable. On the outside, the cable is covered with a fire-resistant thermoplastic sheath, which does not contain halogen elements and does not harm the environment. This type of optical thermal cable is ideal for use in various ambient temperatures and harsh operating conditions.

Structure of the Protectowire PFS series optical thermal cable

PFS-604-MF- The main feature of the MF cable is the absence of metal. This type of cable is specially designed for use in places exposed to electromagnetic radiation, such as tunnels, cable routes high voltage and transformer substations. Unlike the FR series, the stainless steel tube and braid are replaced with polyamide tube and aramid fiber braid. This helps to minimize the risks associated with electromagnetic interference. The outer shell is also made of flame retardant thermoplastic, as is the entire PFS range of products. This type of optical thermal cable is multi-purpose and is equally suitable for industrial and commercial applications.

Mounting accessories

A wide range of accessories is available for installation and maintenance of the optical thermal cable. They include several types of clips, ties, O-rings, mounting clips, cable lugs, connectors and zone boxes. Proper use of these accessories guarantees reliable installation. Equipment approved or supplied by Protectowire must be used for installation and servicing.

OTS Series Controller

To receive and process information from the fiber optic thermal cable, as well as to issue signals to alarm systems, FiberSystrm 4000 includes an OTS controller.

Features of OTS series controllers.
- Unique abilities zoning. Single line cables can be divided into up to 128 zones.
- Different alarm triggering criteria for each zone.
- Programmable control logic.
- Possibility of temperature control along the cable laying line.
- When using additional software, graphical display of zones, indication of temperature changes, determination of the size of the fire source and the spread of fire are available.
- Possibility of transmitting information via Ethernet interface (TCP/IP).

Protectowire OTS 4000 controller

Each OTS controller has 4 optically isolated inputs and 10 programmable dry contact outputs (9 alarm outputs and 1 universal output) to transmit status information to the control panel. Optionally available additional blocks with universal programmable outputs (“dry contact”). To download the initial configuration, a connection to a computer (PC) via the RS232 interface is provided.

Each controller can be connected to a PC with installed program visualization that allows you to clearly display the status of zones and temperature changes. An additional Ethernet interface (TCP/IP) is also available for controllers for network integration.

OTS Controller Configuration

The OTS controller is designed for installation in a standard 19-inch rack and is a modular complex consisting of a signal transmission module, a signal reception module, a digital module (also containing RS232, Ethernet interfaces) and a power supply module (24V DC or optional 115/ 230V AC).

The signal transmission module contains semiconductor laser and means of its control, the function of which is a source of laser radiation.

The signal receiving module contains all the necessary optical system, including optical receiver. The function of this module is to receive laser radiation generated by the transmission module and passed through the optical cable. The module carries out optical and electrical transformations of Raman backscattering, obtained in the form of a spectral distribution, and its amplification.

The digital module controls all controller operations and the temperature measurement process. Based on the received data, the module calculates temperature changes along the entire length of the cable, manages alarms distributed across zones, and exchanges information via RS232 interfaces or through an additional Ethernet interface. Software devices (firmware) is also stored in this module.

The power supply module supplies operating voltage to all device components.

OTS Controller Specifications

Overall dimensions of the controller (H x W x D): 135mm x 449mm x 318mm
Weight: 10.2kg
Operating temperature: 0°С... +40°С
Maximum air humidity: 95% (non-condensing)

SPR 4x4 control panel and PIM modules

To work together with the thermal cable, interface modules PIM-120, PIM-430D, as well as the SPR 4x4 control panel have been developed.

The SPR 4x4 control and reception device has four cables for connecting a thermal cable. Each loop can connect up to 1200 m of detector. The built-in meter counter allows you to determine the trigger point with an accuracy of one meter. The device has four output relay groups and flexible logic for combining loops and output signals into zones.

Main characteristics:

4 addressless alarm loops
. 1 control loop
. 4 control loops
. Power supply 220V (AC), 50Hz, power consumption 0.3kW
. Two rechargeable batteries 12V, 7A*h
. Output relays “Fault”, “Fire”
. DIP switches for programming control loops

For connection to addressless PPKUP loops from other manufacturers, as well as to input modules of addressable fire alarm systems, interface modules PIM-120 and PIM-430D have been developed, which consist of an electronic board mounted in plastic case with transparent lid.

A distinctive feature of PIM-120 is its extended operating range (the ability to connect a thermal cable up to 2000m long), small dimensions, as well as low cost. On the front side of the board there are LEDs indicating the status of “Fire” (red), “Fault” (yellow) and “Power” (green).

PIM-430D has two independent loops for connecting a thermal cable with the ability to connect up to 2000 m of detector to each loop (when using a two-temperature cable, both inputs of the device loop are used for one detector). The PIM-430D has a 4-digit digital indicator located at the top of the board, which displays the distance in meters to the thermal cable stabilization point (the maximum detection length is up to 2000 m for each loop). When connecting two single-temperature thermal cables (separately) or a two-temperature cable (with a common point), the length to the detector trigger point is indicated manually using a three-position switch. In standby mode, the indicator is de-energized and does not consume energy. On the front side of the PIM-430D board there are five LEDs to indicate the “Fire” (red) and “Fault” (yellow) states for each of the two loops, as well as “Power” (green). The block transitions to the “Fire” state when any connected linear detector is triggered. In this case, the signal loop is not blocked - the device returns to standby mode automatically after
eliminating the cause that caused the “Fire” condition. The “Fault” signal is generated when the connection circuit of the linear heat detector.

For their operation, interface converters PIM-120 and PIM-430D require power from external source 24V (DC). All output signals of the devices are “dry contact”.

* It is recommended to connect PIM modules to the control device according to the classical scheme with the transmission of the “Fire” and “Fault” signals into one loop. To increase the reliability of the system and increase the reliability of events, it is recommended to connect several PIM-120 modules to two single-threshold loops of control devices, or to two inputs of monitoring modules, when used in addressable systems.

* It is recommended to connect PIM modules to the control device according to the classical scheme with the transmission of the “Fire” and “Fault” signals into one loop. To increase the reliability of the system and increase the reliability of events, it is recommended to connect the PIM-430D module to two single-threshold loops of control devices, or to two inputs of monitoring modules when used in addressable systems.

Trigger Point Determination Calibration

After installing the PIM-430D, it is necessary to calibrate it to compensate for the resistance of the cable that connects the PIM-430D to the zone box (the initial section of the thermal cable loop). To do this, you must perform the following procedures:

1. Disconnect all equipment from the PIM-430D output relay contacts before energizing it.

2. Close the contacts of loop No. 1 in the first zone box (when using a two-temperature cable, close the contacts of the low temperature and the common cable)

3. On the PIM-430D module, tilt the thermal cable length display switch to the left and hold it in this position. The display will show the length of the thermal cable. 4. To calibrate (set the zero length of the thermal cable), you need to turn the potentiometer screw Z1 to a position at which the display displays “0”. After this, remove the jumper (installed in step 2) and reset the PIM-430D by switching on again. When using a two-temperature TRI-Wire cable, you must immediately proceed to step 6.
5. This procedure is intended in the case of using two PIM-430D cables for applications with two two-core thermal cables. It is necessary to carry out the measures described in paragraphs 2, 3, 4, applicable to loop No. 2. In this case, it is necessary to use the input contacts of cable No. 2, potentiometer Z2 and the switch for displaying the cable length, while deflecting it to the right.
6. This procedure is a calibration of the built-in counter. The procedure is carried out by the manufacturer and does not require configuration. However, this may be necessary if incorrect meter readings are detected. Calibration is carried out after setting the zero position, described in paragraph 4. In this case, it is necessary to close the contacts of the thermal cable line at the location where the terminal resistance is installed (in the last zone box) of loop No. 1 (or the contacts of the pre-alarm loop when using a two-temperature TRI-Wire cable). In the two-temperature TRI-Wire cable, the pre-alarm function (low temperature response) is implemented with pink and black conductors.

To carry out calibration, you need to tilt the thermal cable length display switch to the left and hold it in this position. Use the “Calibrate” potentiometer screw to adjust until the display shows the actual length of the thermal cable installed in the cable. No more calibrations for this module
no need to carry out.

7. Carry out similar procedures for all PIM-430D modules used in the system. After performing the calibrations, connect all devices to the PIM-430D that were disabled in step 1 and perform a general system reset.

Thermal cable. Basic provisions

The Protectowire Linear Heat Detector operates on the principle of a normally open contact that closes when triggered. In this regard, the thermal cable should only be used in fire alarm loops that can detect a contact closure and transmit an alarm signal.

Protectowire thermal cable is a contact device with active resistance distributed along the entire length of the cable, unlike traditional point thermal
detectors that change their resistance when triggered. The relatively high resistance of the detector (1 Ohm for every 1.5 m of twisted pair) requires measurements of the resistance of each device to which the thermal cable will be connected to determine the maximum allowable length of the detector in order to avoid exceeding the established maximum resistance of the fire alarm loop.

When using large sections of thermal cable, the resistance in the loop may exceed the permissible values, as a result of which the control panel will constantly issue a “Fault” signal, or the alarm loop will not be able to generate an alarm. This problem is solved using interface modules PIM-120 and PIM-430D, to which you can connect up to 2000 m of thermal cable (PIM-430D - up to 2000 m of thermal cable for each loop).

Installation of thermal cable

The Protectowire thermal cable must be laid in sections without taps and branches, in accordance with the existing standards of the Russian Federation for the location and configuration of a linear heat detector in space. In addition to the requirements for dividing into detection zones (determination of the alarm source), the length of each piece of thermal cable is limited and controlled by the device to which the detector is connected.

Thermal cable location

In accordance with the existing requirements of the Russian Federation, the Protectowire linear heat detector must be located under the ceiling or in direct contact with the fire load. The distance from the sensitive element of the detector to the ceiling must be at least 25mm. When storing materials on racks, thermal cables can be laid along the top of tiers and racks.

The thermal cable is laid directly above the source of danger so that it is exposed to hot air in case of fire or under any horizontal
a surface that will cause a similar radial spread of heat as the ceiling of the room in which the protected object is located.

In some cases, it is very important to detect overheating, which can cause equipment failure or fire. A typical example is the protection of electric motors or conveyor rollers, the roller bearings of which overheat and jam. In such cases, the thermal cable can be installed close to the critical part of the protected object, which ensures quick response of the detector.

Laying routes for a linear heat detector

All models of Protectowire linear heat detector have been tested and certified by Underwriters Laboratories (UL, USA) and VNIIPO EMERCOM of Russia. By
The results of tests carried out in accordance with the requirements of testing standards established by certification bodies determined the maximum permissible distances between thermal cable laying lines relative to the maximum detector coverage area for various applications.

Maximum distance between Protectowire thermal cable runs

When installing a thermal cable, it is very important to keep in mind that the distances included in the existing norms and requirements of the Russian Federation represent the maximum permissible values ​​between sections of the thermal cable and should be used as a starting point for designing the location of the detector. Depending on specific application conditions, such as ceiling design and height, physical obstructions, air currents, or local fire regulations, the maximum permissible distance between thermal cable runs may be reduced.

When installing thermal cables on ceilings, the distance between parallel sections of cables should not exceed the maximum permissible value specified by the existing standards and requirements of the Russian Federation. Thus, the thermal cable should be laid at a distance of no more than ½ of the established permissible value from all walls or ceilings (beams) protruding no more than 50 cm, as shown in Figure 1.

If the ceiling beams protrude downwards from the ceiling at a distance of more than 50 cm, it is recommended to lay a thermal cable line through each compartment formed by these beams.

"Dead zone

Warm air rises from the source of the fire to the ceiling, spreading radially. As the air cools, it begins to sink. The corner where the ceiling and two adjacent walls meet forms an area called the “dead” zone (see Fig. 2). In most fire cases, this area is a triangle with sides 10cm along the ceiling (measured from the corner) and 10cm down the wall. Do not install Protectowire thermal cable in this area!

"Dead zone" when installing a thermal cable

Sloping ceilings

In a room with a sloping or gabled ceiling

Linear heat detector (thermal cable) manufactured by Protectowire (USA)

Call for pricing!

Linear heat detector (thermal cable) produced by the company Protectowire(USA) is a cable that is designed to detect fires by an increase in the optical density of the environment when it is smoke-filled, by the value of the ambient temperature anywhere along its entire length. The thermal cable is a continuous sensor and is used in cases where conditions do not allow the installation and use of heat point detectors, and in conditions of increased explosion hazard, the use of a thermal cable is the optimal solution.

Main characteristics

Set response temperature throughout;

Issuing a "FIRE" signal based on six temperature values;

High resistance to humidity, dust, low temperatures and chemicals;

Indispensable in hazardous areas;

Easy to install and configure;

Economical, no operating costs;

If necessary, extensions are simply added to the system;

Does not require maintenance;

Expected service life more than 25 years;

Has a SSPB certificate.

Description

The Protectowire Linear Heat Detector consists of two steel conductors, each of which is insulated with a heat-sensitive polymer. Insulated conductors are twisted to create mechanical stress between them, then coated with protective insulation and encased to protect them from exposure to harsh environmental conditions.

When a threshold temperature value is reached, under the influence of pressure from the conductors, the insulating coating made of a heat-sensitive polymer is destroyed, and the conductors short-circuit. This occurs at the first overheating point along the thermal cable route. The Protectowire thermal cable is a maximum heat detector and therefore allows an alarm to be generated when a temperature threshold is reached at any point along the entire length of the cable.

Classification of thermal cable

Currently, there are four types of thermal cables: EPC, EPR, XLT, TRI (TRI-Wire™), differing in purpose and material from which the outer protective sheath is made, for use in a wide variety of environmental conditions.

Type EPC

Thermal cable type EPC has a vinyl protective sheath, which gives the cable good flexibility at low ambient temperatures. The thermal cable is universal and well suited for both industrial and commercial use.

Type EPR

Thermal cable type EPR has a durable, fire-resistant outer sheath made of polypropylene that is resistant to ultraviolet radiation. Designed for wide industrial use in places with elevated ambient temperatures. It has high reliability, elasticity, resistance to abrasion and exposure to atmospheric factors.

PHSC-190-EPR
PHSC-280-EPR
PHSC-356-EPR

Type XLT

Thermal cable type XLT has a special outer sheath that is resistant to low temperatures. Specially designed for use at extremely low temperatures in warehouses, refrigerators, freezers, unheated warehouses, as well as in the harsh climatic conditions of the north.

TRI type (TRI-Wire™)

Thermal cable type TRI (TRI-Wire™) is a combined (two-temperature) heat detector that produces “ATTENTION” and “FIRE” signals based on the set temperature thresholds. The thermal cable has a durable, elastic, moisture- and fire-resistant vinyl outer sheath that is resistant to most common chemicals.

Technical data

Protectowire thermal cable installation method

The Protectowire thermal cable must be laid in solid sections without bends or branches in accordance with the requirements of fire inspection authorities for the location and configuration of the thermal cable in space. In addition to the requirements for dividing into detection zones (determination of the alarm source), the length of each piece of thermal cable is limited and controlled by the control device to which the detector is connected.

Standards for installing a thermal cable (linear heat detector) in accordance with NPB 88-2001*, clause 12.37

The Protectowire Linear Heat Detector operates on the principle of a normally open contact that closes when triggered. Therefore, the thermal cable should only be used in alarm loops that can detect a contact closure and transmit an alarm signal.

The Protectowire thermal cable is a contact device with active resistance distributed along the entire length of the cable, unlike traditional point heat detectors that change their resistance when triggered. The relatively high resistance of the detector, 1 Ohm for every 1.5 m of twisted pair, requires measurements of the resistance of each device to which the thermal cable will be connected, in order to determine the maximum allowable length of the thermal cable in order to avoid exceeding the established maximum resistance of the alarm loop.

When using large sections of thermal cable, the resistance in the loop may exceed the permissible values, as a result of which the control panel will constantly issue a “Fault” signal, or the alarm loop will not be able to generate an alarm. This problem is solved with the help of interface modules PIM-120, to which you can connect up to 2000 meters of thermal cable and PIM - 420D - 1525 meters of thermal cable.

The Protectowire linear heat detector responds to changes in ambient temperature when a fire occurs. Therefore, the installation materials used must provide adequate support at temperatures not below the threshold value. Fastening devices are installed every 1.5-3 m, and also if it is necessary to prevent excessive sagging of the wire, which causes tension on the wire at the fastening points. Incorrect installation or fastening of the thermal cable can lead to mechanical damage to the detector, for example, in technological areas, warehouses using loading equipment.

Thermal cable location.

The Protectowire linear heat detector must be installed in the protected area on the ceiling or on the walls at a distance of no more than 500 mm from the ceiling. The thermal cable is laid directly above the source of danger, so that it (the thermal cable) is exposed to hot air in the event of a fire, or under any horizontal surface that will cause the same radial spread of heat as the ceiling of the room in which the protected object is located.

In some cases, it is very important to detect overheating, which can cause equipment failure or fire. A typical example is the protection of electric motors or conveyor rollers whose roller bearings overheat and seize.

The advantage of the Protectowire thermal cable is that it can be installed close to a critical part of the protected object, which ensures rapid response of the detector.

Laying the detector route

All Protectowire Linear Heat Detector models have been tested by Underwriters Laboratories (UL) and/or Factory Mutual Research Corporation (FM). Based on the results of tests carried out in accordance with the requirements of testing standards established by certification bodies, the maximum permissible distances between thermal cable laying lines relative to the maximum detector coverage area for various applications were determined.

Maximum distance between Protectowire thermal cable runs.

When installing a thermal cable outdoors, it is very important to keep in mind that the distances included in NPB 88-01 represent the maximum allowable distance between sections of the thermal cable and should be used as a starting point for designing the location of the detectors. Depending on specific application conditions, such as ceiling design and height, physical obstructions, air currents, or local fire code requirements, the maximum permissible distance between thermal cable runs may be less. The final route and distance between the thermal cable lines are determined based on the results of an engineering assessment.

Installing Protectowire thermal cable on smooth ceilings

When installing thermal cables on smooth ceilings, the distance between parallel sections of cables should not exceed the maximum permissible value specified in NPB 88-01. Thus, the thermal cable should be laid at a distance of no more than 1/2 of the established permissible value from all walls (the distance is measured from the right corner) or ceilings protruding no more than 50 cm, as shown in the figure:

Beam construction

In structures with beam floors, etc. heat falls freely along the beams. However, horizontal heat distribution is difficult due to the beams, so in this direction the distance between the thermal cable lines should be less. The thermal cable is laid along the underside of the beams, the distance between all thermal cable lines parallel to the beams should not exceed 50% of the distance between the cable lines laid on a smooth ceiling

Beam structure

If the ceiling beams protrude no more than 100 mm, the ceiling is considered smooth; if more, the thermal cable is laid from the right corner at a distance of no more than 2/3 of the distance when installed on a smooth ceiling. If a beam extends downward from the ceiling for a distance of more than 50 cm and less than 2.4 m at the center, each compartment formed by the beams must be protected separately.

"Dead zone

Warm air rises in a stream from the source of the fire to the ceiling, spreading radially. As the air cools, it begins to sink. The corner where the ceiling and two adjacent walls meet forms an area called the dead zone. In most fire cases, this dead zone is a triangle with sides 10 cm along the ceiling (measured from the corner) and 10 cm down the wall. Do not install Protectowire thermal cable in this area!

Sloping ceilings

In a room with a sloping ceiling or gabled roof, one or more Protectowire linear heat detectors should be installed no more than 0.9m from the highest point of the roof, measured horizontally. The distance between additional Protectowire thermal cable lines, if installed, is determined based on the horizontal distance measured when projecting down from the ceiling and taking into account the ceiling design.

Extension of thermal cable

The variety of Protectowire linear heat detector designs and braided materials provide resistance to a variety of chemicals, liquids and weather conditions, making the cable suitable for a wide range of applications.

Since it is not always possible to accurately determine the effectiveness of the negative impact of aggressive environments on a thermal cable, we recommend, if possible, testing samples at the installation site of the system to determine whether or not the selected thermal cable models are suitable for given environmental conditions.

When designing a detection system for outdoor use, solar radiation exposure must be taken into account. Direct sunlight or so-called “total radiation” can cause the cable or mounting surface to heat above the maximum permissible ambient temperature or sensor temperature threshold.

Therefore, preventive measures are very important, such as a protective shield over the cable to reduce the temperature to acceptable values. In addition, the screen will slow down the destruction of the protective braiding of the thermal cable under the influence of solar radiation. In the EPN and EPR thermal cable models, a special inhibitor is added to the material from which the protective braid is made to protect against ultraviolet radiation and extend the service life of the detector.

When using a thermal cable outdoors, all connections using the recommended splicing method or through terminals must be made in appropriate junction boxes. If the cable is installed in high humidity conditions, all connections are made by splicing using PWSC or PWS conduit and SFTS insulating tape.

Warnings

The linear heat detector is made of durable material, but it can be damaged if squeezed or punctured. The results of such damage may not be externally visible on the conductor and may not be immediately apparent, but damage to the outer protective braid or mechanical stress on the conductor during installation may later cause false alarms.

Therefore, during installation you CANNOT:

Leave the cable on the floor, walk on it, or place a ladder on it during installation;

Use non-original fastening devices unless approved by The Protectowire Company;

Lay the thermal cable in places where there is a risk of mechanical damage during technological processes;

Do not overtighten the fasteners, as this may destroy the outer protective braid and the inner insulating layer and, as a result, cause false alarms. All fastenings must allow the wire to compress and expand with temperature fluctuations;

It is normal to stretch the thermal cable too much; some “sagging” of the wire between the fasteners is normal;

BEND THERMAL CABLE AT AN ANGLE 90°;

Use pliers or tongs to bend the thermal cable. All bends are made only by hand, the bend radius should not be less than 6.5 cm;

Use wire nuts or other similar devices. All connections must be made through Protectowire terminals and/or pigtails;

PAINT THE LINEAR HEAT DETECTOR.