Radial connection. General technical (radial connection) Technical characteristics of a radial pressure gauge
Hydraulic pressure gauge with graduated scale from 0 to 100 bar, filled with glycerin.
Characteristics:
Scale graduation 0...100 bar
Housing made of of stainless steel
Radial connection (bottom) 1/4" BSP
Diameter 63 mm
Accuracy class at oil temperature 20°C ± 1.6%
Dial material: aluminum, enameled using high-temperature method.
Main elements of a pressure gauge:
- Bourdon tube made of copper alloy for pressure range from -1 to 40 bar;
- Copper alloy spiral tube for pressure range from 50 to 1000 bar.
Soldered joints are made using tin solder.
Protection class: IP65. Pressure gauges in this series are highly durable and have a wide range of applications - plumbing systems, pumps, compressors, machine equipment, water washers high pressure, refrigeration systems.
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Hydraulic pressure gauges filled with glycerin are used to measure pressure in a hydraulic system. Pressure gauges can have different scale graduations, for example, bar or psi. Pressure gauges can have a bottom connection (radial) or a rear connection (axial). Pressure gauges produced by Nuova Fima (Italy) have been widely used in mechanical engineering and machine tools since 1967.These pressure gauges are used for sewage systems, pumps, compressors, machine tools, high-pressure water filters, and cooling systems.
The radial bimetallic thermometer is designed for measuring the temperature of liquids and gases in heating and sanitary installations, in air conditioning and ventilation systems. The operating principle of BT thermometers is based on the dependence of deformation sensitive element on the measured temperature. A bimetallic spring is used as a sensing element. A bimetallic spring is made of two firmly connected metal plates, having different temperature coefficients of linear expansion. When the temperature changes, the spring bends and rotates the thermometer needle. One end of the spring is fixed inside the rod, and the arrow axis is attached to the other.
The thermometer body is made of corrosion-resistant steel, the stem is made of stainless steel.
Scope of application: air conditioning systems, heat supply, water supply.
When measuring the temperature of aggressive media, it is recommended to equip the thermometer with a stainless steel sleeve.
Case diameter
Accuracy class
Temperature ranges
−30…+70 °С* −40…+60 °С**
0…+60 °С 0…+100 °С
0…+120 °С 0…+160 °С
0…+200 °С 0…+250 °С
0…+350 °С 0…+450 °С * - only for Ø100
** - only for Ø63
Working temperature
Environment: −10…+60 °C
Degree of protection
Immersion length, mm
46; 64 (except t°=0…+60 °C);
150 (for Ø63 only up to 250 °C);
200, 250 and 300 (only for Ø100)
Frame
Corrosion resistant steel
Ring
Corrosion-resistant steel, bayonet
Stock
Stainless steel
Sensing element
Bimetallic spiral
Clock face
Aluminum, black scale on white background
Glass
Mineral
Accession
Radial
Connection thread
on the sleeve - G½ or M20×1.5
on the sleeve - 10 MPa (100 kgf/cm²)
Adjustment
Calibration interval
3 years - with a measurement range of +20...+100 °C, +20...+140 °C
2 years - for all other ranges
The term “pressure gauge” used in the text is general and, in addition to pressure gauges itself, also implies vacuum gauges and pressure-vacuum gauges. IN this material Digital devices are not considered.
Pressure gauges are one of the most common devices in industry and housing and communal services. For more than a hundred years they have been reliably serving people. The needs of production initiated the development of pressure gauges for various purposes, differing in size, design, connecting thread, ranges and units of measurement, accuracy class. Incorrect choice devices leads to their premature failure, insufficient measurement accuracy or overpayment for unnecessary functionality.
Pressure gauges can be classified according to the following criteria.
- By area of application.
1.1. Standard technical pressure gauges are designed for measuring excess and vacuum pressure of non-aggressive, non-crystallizing liquids, steam and gas.
1.2. Technical special - pressure gauges for working with specific media or under specific conditions. The following pressure gauges are special:
Oxygen;
Acetylene;
Ammonia;
Corrosion resistant;
Vibration-resistant;
Ship;
Railway;
Pressure gauges for the food industry.
Oxygen pressure gauges are structurally no different from technical pressure gauges, but during the production process they undergo additional cleaning from oils, since when oxygen comes into contact with oils, ignition or an explosion can occur. The designation O 2 is applied to the scale.
Acetylene pressure gauges are manufactured without the use of copper and its alloys. This is due to the fact that the interaction of copper and acetylene produces explosive copper acetylene. Acetylene pressure gauges are marked with the symbols C 2 H 2.
Ammonia and corrosion-resistant pressure gauges have mechanisms made of stainless steel and alloys that are not subject to corrosion when interacting with aggressive environments.
The design of vibration-resistant pressure gauges ensures operability when exposed to vibration in a frequency range approximately 4-5 times higher than the permissible vibration frequency of standard technical pressure gauges.
Some types of vibration-resistant pressure gauges can be filled with damping fluid. Glycerin (operating temperature range from -20 to +60 o C) or PMS-300 liquid (operating temperature range from -40 to +60 o C) is used as a damping liquid.
Pressure gauges for the food industry do not have direct contact with the medium being measured and are separated from it by a membrane separating device. The space above the membrane is filled with a special liquid, which transmits force to the pressure gauge mechanism.
Pressure gauge housings are usually painted in a color corresponding to the application: ammonia - yellow, acetylene - white, for hydrogen - dark green, for flammable gases, for example, propane - red, for oxygen - blue, for non-flammable gases - in black.
2. Electric contact (signaling) pressure gauges.
Electric contact (signaling) pressure gauges include contact groups for connecting external electrical circuits. Used to maintain pressure in technological installations within a given range.
Contact groups of electrical contact (signaling) pressure gauges in accordance with GOST 2405-88 can have one of four designs:
III - two break contacts: left indicator (min) - blue, right (max) - red;
IV - two closing contacts: left indicator (min) - red, right (max) - blue;
V - left normally open contact (min); right closing contact (max) - both indicators are blue;
VI - left normally open contact (min); right contact is normally closed (max) - both indicators are red.
Most Russian factories accept version V as standard. That is, if the application does not indicate the design of the electrical contact pressure gauge, then the customer is almost guaranteed to receive a device with contact groups of this design. In the absence of a passport, you can determine the design of the contact groups by the color of the indicators.
Electroconical (signaling) pressure gauges are divided into general industrial and explosion-proof. The ordering of explosion-proof pressure gauges must be approached very carefully so that the type of explosion protection of the device corresponds to the high-risk facility.
3. Pressure units.
Pressure gauge scales are calibrated in one of the following units: kgf/cm2, bar, kPa, MPa. However, you can often find pressure gauges with a double scale. The first scale is graduated in one of the units listed above, the second in psi - pound-force per square inch. This unit is non-systemic and is used mainly in the USA. In table 1 shows the relationship between these units.
Table 1. Ratio of pressure units
|
Pa |
kPa |
MPa |
kgf/cm 2 |
bar |
|
|
Pa |
10 -3 |
10 -6 |
10,197*10 -6 |
10 -5 |
|
|
kPa |
10 3 |
10 -3 |
10,197*10 -3 |
10 -2 |
|
|
MPa |
10 6 |
10 3 |
10,1972 |
||
|
kgf/cm 2 |
98066,5 |
98,0665 |
0,980665 |
0,980665 |
|
|
bar |
10 5 |
1,0197 |
|||
|
6894,76 |
6,8948 |
6,8948*10 −3 |
70,3069*10 −3 |
68,9476*10 −3 |
Instruments calibrated in kPa are called pressure gauges for measuring low pressures gases A membrane box is used as a sensing element, while in pressure gauges for high pressures a curved or spiral tube is used.
4. Range of measured pressures.
In physics, there are several types of pressure: absolute, barometric, excess, vacuum. Absolute pressure is pressure measured relative to absolute vacuum. Absolute pressure cannot be negative.
Barometric is Atmosphere pressure, which depends on altitude above sea level, temperature and humidity. At zero meters above sea level it is taken to be 760 mm mercury. In technical pressure gauges, this value is taken as zero, that is, the value of barometric pressure does not affect the measurement results.
Gauge pressure is the difference between absolute pressure and barometric pressure, provided that the absolute pressure exceeds the barometric pressure.
Vacuum is the difference between absolute pressure and barometric pressure, when absolute pressure is less than barometric pressure. Therefore, vacuum pressure cannot be greater than barometric pressure.
Based on this, it becomes clear that vacuum gauges measure vacuum. Pressure and vacuum gauges cover the vacuum region and overpressure. Pressure gauges measure excess pressure. There is another class of instruments called differential pressure gauges. Differential pressure gauges are connected to two points of one system and show the pressure difference of gaseous or liquid substances.
The ranges of measured pressures are standardized and assumed to be equal to a certain range of values, which are given in table. 2.
Table 2. Standard range of values for calibration of scales.
|
Device type |
Ranges of measured pressures, kgf/cm 2 |
|
Vacuum gauges |
1…0 |
|
Pressure and vacuum gauges |
1…0,6; 1,5; 3; 5; 9; 15; 24 |
|
Pressure gauges |
0…0,6; 1; 1,6; 2,5; 4; 6; 10; 16; 25; 40; 60; 100; 160; 250; 400; 600; 1000; 1600 |
|
0…2500; 4000; 6000; 10000
|
5. Accuracy class of pressure gauges
Accuracy class is the permissible error of a device, expressed as a percentage of the maximum scale value of a given device. The accuracy class is applied by manufacturers to the scale. The lower this value, the more accurate the device. The same type of pressure gauge may have different class accuracy. For example, the Manotom plant produces standard devices with an accuracy class of 1.5, and can produce similar devices with an accuracy class of 1.0 upon request. In table 3 shows data on accuracy classes in relation to various types pressure gauges.
Table 3. Accuracy class of pressure gauges from Russian manufacturers.
|
Device type |
Accuracy class |
|
Exemplary pressure gauges |
0,15; 0,25; 0,4 |
|
Pressure gauges for precise measurements |
0,4; 0,6; 1,0 |
|
Technical pressure gauges |
1,0; 1,5; 2,5; 4 |
|
Ultra-high pressure gauges |
For imported devices, the accuracy class value may differ slightly from Russian analogues. For example, European technical pressure gauges may have an accuracy class of 1.6.
The smaller the diameter of the device body, the lower its accuracy class.
6. Case diameter
Most often, pressure gauges are manufactured in cases with the following diameters: 40, 50, 60, 63, 100, 150, 160, 250 mm. But you can find devices with other body sizes. For example, vibration-resistant pressure gauges produced by Fiztekh, type DM8008-Vuf (DA8008-Vuf, DV8008-Vuf) are manufactured in cases with a diameter of 110 mm, and a smaller version of this device, DM8008-Vuf (DA8008-Vuf, DV8008-Vuf) Version 1, has diameter 70 mm.
Pressure gauges with a body of 250 mm are often called boiler gauges. They do not have special designs and are used at thermal power facilities and allow the operator to control pressure at several nearby installations from the operator’s workplace.
7. Design of pressure gauges
A fitting is used to connect the pressure gauge to the system. There are radial (bottom) location of the fitting and axial (rear) location. The axial fitting can be centrally located or offset relative to the center. Many types of pressure gauges available design features They are not available with an axial fitting. For example, signaling (electric contact) pressure gauges are made only with radial fitting, since the electrical connector is located on the back side.
The size of the thread on the fitting depends on the diameter of the body. Pressure gauges with diameters of 40, 50, 60, 63 mm are manufactured with threads M10x1.0-6g, M12x1.5-8g, G1/8-B, R1/8, G1/4-B, R1/4. On pressure gauges bigger size M20x1.5-8g or G1/2-B is used. European standards provide for the use of not only the above types of threads, but also conical ones - 1/8 NPT, 1/4 NPT, 1/2 NPT. In addition, industry uses specific connections. Pressure gauges measuring high and ultra-high pressures can have internal conical or cylindrical threads.
The design of the pressure gauge body depends on the installation method and location. Devices installed openly on highways, as a rule, do not have additional fastenings. When installed in cabinets, control panels, pressure gauges with a front or rear flange are used. The following versions of pressure gauges can be distinguished:
With radial fitting without flange;
With radial fitting with rear flange;
With axial fitting with front flange;
With axial fitting without flange.
Standard pressure gauges usually have a degree of protection IP40. Special pressure gauges, depending on the application, can be manufactured with degrees of protection IP50, IP53, IP54 and IP65.
In some cases, pressure gauges must be sealed in order to prevent the possibility of unauthorized opening of the devices. For this purpose, some manufacturers make an eye on the body and complete it with a screw with a hole in the head, allowing the seal to be installed.
8. Protection against high temperatures and pressure changes
Temperature has a serious influence on the measurement error and service life of pressure gauges. This factor affects the internal elements of the structure upon contact with the measured medium, and externally through the ambient temperature.
Most pressure gauges should be operated at an ambient and measured medium temperature of no more than +60 o C, maximum +80 o C. Some manufacturers manufacture instruments designed for temperatures of the measured medium up to +150 o C and even +300 o C. However, measurements at high temperatures can be produced using standard pressure gauges. To do this, the pressure gauge must be connected to the system via a siphon outlet (cooler). A siphon tap is a tube special form. At the ends of the outlet there is a thread for connecting to the main line and attaching a pressure gauge. The siphon outlet forms a branch in which there is no circulation of the measured medium. As a result, at the point where the pressure gauge is connected, the temperature may differ significantly from the temperature in the main line.
Another factor affecting the longevity of pressure gauges is sudden changes pressure or water hammer. To reduce the influence of these factors, dampers are used. The damper can be made as a separate device installed in front of the pressure gauge or mounted in the internal channel of the device holder.
There is another way to protect the pressure gauge. In cases where there is no need to constantly monitor the pressure in the system, a pressure gauge can be installed through a push-button valve. Thus, the device will be connected to the controlled line only for the time during which the tap button is pressed.
Pressure gauges are a broad group of mechanical devices designed to measure the pressure of various media. The importance of these devices cannot be overestimated because pressure control is an important procedure for many industrial sectors.
| Image | Name | Price per piece VAT included |
|---|---|---|
| ACR axial pressure gauge, 0-6 bar | RUB 300.00 | |
| ACR radial pressure gauge, 0-6 bar | RUB 300.00 | |
 | Pressure gauge WATTS F+R100 (MAL), G1/4, 0-6 bar, axial | 6,5 € |
 | 6,5 € | |
| | 6,5 € | |
| | Pressure gauge WATTS F+R200 (MRP), 0-10 bar, radial | 6,5 € |
Characteristics:
Pressure gauges differ in technical characteristics, accuracy class and scope of application. Each device is necessarily certified by the manufacturer. Pressure gauges are manufactured in the following accuracy classes: 0.2; 0.6; 1.0; 1.5; 2.5; 4.0 (the higher, the higher the accuracy of the device).
According to technical characteristics, pressure gauges are of the following types:
- Technical. Pressure gauges of this type make it possible to measure both excess and vacuum pressure of neutral liquids and gases that are not subject to crystallization;
- Electric contact. The pressure of neutral and non-crystallizing media and oxygen is measured. Pressure gauges of this type can be used not only as control device, but also as an actuator capable of blocking the process (pressure switch);
- Self-recording. Vacuum and excess pressure are measured. Purely a control device. It records on a special medium not only pressure indicators, but also the mode and schedule of its work.
- Reference. Designed for checking pressure gauges;
- Water pressure gauge. Used to measure water pressure in heating and water supply systems. There are two types of water pressure gauges - radial and rear (axial).
According to the principle of operation, pressure gauges are divided into three types:
- Liquid - pressure gauges in which the pressure of the medium is compensated by a column of liquid;
- Piston - act as a compensator by acting on a freely moving piston;
- Deformation - the degree of deformation of the control element (bellows, membrane, spring) is measured.
There are two types of pressure gauges based on the connection method:
- Axial (axial) RA, threaded connection is located on the rear panel of the device;
- Radial RV, the thread is located at the bottom of the body.
Pressure gauges for measuring water pressure (axial and radial) are installed in water supply and heating systems using threaded connections. External thread ¼”
You can buy a water pressure gauge from us on favorable terms.
When choosing a pressure gauge for water, you should pay attention to the following parameters
- Accuracy class;
- Scope of application;
- Maximum pressure;
- Connection method (type and size of thread);
- Case diameter
The same device can be used in different environments. If its design includes elements that are unstable to certain environments, then the scale of the device will contain symbols that inform about the features of using this device. More detailed information on recommended areas of application is contained in its technical data sheet.
Instrumentation OWEN
The OWEN company offers the widest range of products among Russian manufacturers. It includes more than 80 types of devices that can be used to build automation systems of any level: - Programmable logic controllers (PLC); input/output modules; operator panels; interface converters. - General industrial regulators, level regulators, specialized controllers, timers, counters, power supplies. - Sensors: temperature, pressure, level. The range of industries where OWEN devices operate is very wide and includes chemical and petrochemical production, metallurgical and woodworking enterprises, food and packaging industries, energy, housing and communal services and many others.
Devices Termodat, Meradat
Instruments for measuring and regulating temperature, humidity, vacuum under the TERMODAT and MERADAT brands. The lineup devices covers both the simplest single-channel meters and complex multi-channel controllers with a large graphic display.
Pressure gauges and instruments ROSMA
JSC "Rosma" today is one of the largest domestic producers control and measuring instruments, firmly ranking among the top five market leaders in this field. Some of the most popular instruments are pressure gauges, thermometers, thermomanometers, media separators, electromagnetic (solenoid) valves, pressure sensors and switches, pressure transducers, level sensors.
Devices for protecting electric motors and other electrical installations
Designed to prevent failure of electric motors and units based on them in the event of unacceptable operating conditions caused by various operational factors: technological overloads; breakdowns and jamming of mechanisms; idling; asymmetry of the supply network or malfunction of switching equipment. Provide protective shutdown of the electric motor in the event of unacceptable (emergency) operating modes: current overload; current underload; open-phase operation; exceeding the permissible current imbalance. A unique property of the devices is the presence of a monitoring function - continuous monitoring of the operation of electric motors, registration of modes and events, accumulation of statistical data on the operation of electric motors and units based on them, protection of electric motors.
Radial connection
Radial thermomanometer is designed for simultaneous measurement of temperature and excess pressure of non-aggressive copper alloys avg. Application area: heating systems, water supply, boilers, steam boilers etc. Thermomanometer is a combined device for measuring pressure and temperature. For visual monitoring of the main parameters of the coolant (pressure and temperature), a pressure gauge and thermometer are usually used. An attempt to combine these two devices led to the creation of a combined device called a thermomanometer. Structurally, the TMTB thermomanometer combines a deformation pressure gauge and a bimetallic thermometer. Thermal manometers have a dial with two scales and two indicating hands. One scale is used to read pressure, the other – temperature. The ROSMA company produces thermomanometers in two sizes: case diameter 80 and 100 mm. Depending on the location of the fitting, thermomanometers can be axial or radial. The length of the immersion part can also vary according to the customer's order. All thermomanometers are equipped with a safety valve that allows you to dismantle the thermomanometer without depressurizing the system.
Case diameter
Accuracy class
Temperature ranges
0…120 / 150 °C
Pressure reading range
Working temperature
Environment: −60…+60 °C
Measured medium: up to +150 °C
IP40, steel 10, black
Chromed steel 10
Sensing element of the manometric part
Copper alloy
Sensing element of thermometric part
Bimetallic spiral
Tribco-sector mechanism
Copper alloy
Copper alloy
Clock face
Aluminum, black scale on a white background, with color division of temperature and pressure measurement sectors
Mineral
Connection for pressure gauge
Copper alloy
Thermometer rod
Stainless steel 08Х18Н10
Immersion length, mm
46, 64, 100 mm
Accession
Radial
Connection thread
G½ (on valve)
Calibration interval
Technical documentation
TU 4212-001-4719015564-2008
GOST 2405-88
Thermal manometers TMTB
| Type | Case diameter | Accuracy class | Reading range (pressure/temperature) | Connection |
Price including VAT, rub. (Not an official offer) |
|||
|---|---|---|---|---|---|---|---|---|
| Thread | Union | L=46 | L=64 | L=100 | ||||
| TMTB-3 | 80 | 2,5 | 0…0.25 / 0.4 / 0.6 / 1 / 1.6 / 2.5 MPa 0…+120 / 150 °C |
G½ | radial, with valve | 1110 | 1165 | 1210 |
| TMTB-4 | 100 | 1175 | 1220 | 1255 | ||||
The valve is a locking device that serves on one side for ease of installation of the device; on the other, it acts as a tap, which allows the thermomanometer to be dismantled without draining the system (or without stopping the technological process). The operating pressure of the valve is 2.5 MPa, the maximum is 5 MPa. In terms of temperature ranges, thermomanometers are available in two versions from 0-120 °C and up to 150 °C, and in terms of pressure 0-0.25 MPa, 0-0.4 MPa, 0-0.6 MPa...0-2.5 MPa .
Unfortunately, consumer technical services often make the mistake of installing an expander or an additional outlet for mounting a thermomanometer. It should be remembered that to measure temperature in the device, a bimetallic spring is used as a sensing element and therefore immersion part The thermomanometer must be in the pipe (in direct contact with the coolant), otherwise a large error occurs when measuring temperature. The temperature measurement error is minimal if the end of the valve is immersed to a depth of no less than ⅓ and no more than ⅔ of the pipeline diameter. Thermal manometers are mounted directly on the pipeline; it is enough to weld a boss with a G½ internal thread to it. Our product catalog contains detailed instructions When installing the thermomanometer and during installation, it is necessary to strictly follow it.
Additional options
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