Structure principle of explosion-proof electric contact pressure gauge

Explosion-proof electric contact pressure gauges are widely used in petroleum, chemical industry, metallurgy, power station, machinery and other industrial departments or electromechanical equipment to measure the pressure of various fluid media without explosion danger. Usually, the instrument can automatically control and send a message (alarm) to various gases and liquid media with measured (controlled) pressure by matching with corresponding electrical devices (such as relays and frequency converters).

Explosion-proof electric contact pressure gauge consists of measuring system, indicating system, magnetic auxiliary electric contact device, shell, adjusting device and junction box (plug seat). General explosion-proof electric contact pressure gauges are used to measure the positive and negative pressures of gas and liquid media that do not corrode copper and copper alloys, while stainless steel explosion-proof electric contact pressure gauges are used to measure the positive and negative pressures of gas and liquid media that do not corrode stainless steel, and send out signals when the pressure reaches a predetermined value to connect the control circuit to achieve the purpose of automatic control alarm.

The explosion-proof electric contact pressure gauge is based on the spring tube in the measuring system under the pressure of the measured medium, forcing the end of the spring tube to produce corresponding elastic deformation-displacement, which is driven by the pull rod through the gear transmission mechanism and amplified, and the measured value is indicated on the dial one by one by the indication on the fixed gear (together with the contact). At the same time, when it is in contact with the contact (upper limit or lower limit) on the set pointer, the circuit in the control system can be disconnected or connected to achieve the purpose of automatic control and sending an alarm.

Explosion-proof electric contact pressure gauge takes the control of compressor motor as an example: the gas storage filling pressure automatically opens when it reaches the lower limit, and automatically stops when it reaches the upper limit.

The control process of the explosion-proof electric contact pressure gauge is as follows: when the pressure reaches (or is low and low when starting) the lower limit, the movable contact (power supply common terminal) of the electric contact pressure gauge is connected with the lower limit contact, the relay J1 acts and locks itself, and its normally open contact is closed to drive J3, so that the motor is electrically operated. When the pressure reaches the upper limit, the movable contact is connected with the upper limit contact, the relay J2 acts, its normally closed contact is disconnected, the power supply of J1 is cut off, its normally open point is disconnected, J3 is released and the motor stops running. In this way, the automatic control is achieved.

In view of this series of instruments not only have the characteristics of novel design, reliable structure, complete varieties and specifications, good action stability and strong adaptability, but also have the advantages of rich measurement and control, simple installation and small maintenance, so it is an incomparable pressure measurement and control instrument for general pressure controllers without instructions, switching adjustment and external setting devices.

Application of diaphragm pressure gauge in industrial production

In daily industrial production, all kinds of pressure gauges are also indispensable as a common measuring instrument. There are many kinds of pressure gauges, such as pointer indicating type and digital display type, which can also have remote transmission in function, so that pressure data can be monitored without on-site and so on. Today we will talk about diaphragm pressure gauges.

When measuring the pressure of medium, the diaphragm pressure gauge works on the principle that the isolation device is arranged at the periphery of the pressure gauge. The pressure of the medium will be transmitted to the internal pressure gauge through the sealing liquid, and the indicated value will be obtained. Its characteristic is that it works by means of dielectric isolation. Diaphragm pressure gauge is mainly composed of pressure gauge itself and special isolation device.

Diaphragm pressure gauge is a kind of special product used to measure specific media in pressure gauge. Can measure the medium with strong corrosion, high temperature and high viscosity. At present, it is widely used in petroleum, chemical industry, chemical fiber, pharmacy and other places involving the measurement of fluid media with special properties, and diaphragm pressure gauges are widely used in industrial production. Especially in high temperature and high corrosion working environment, diaphragm pressure gauge plays an extremely important role.

Due to the special isolation device, the diaphragm pressure gauge can avoid the accumulation of substances in the medium in the pressure gauge, so the liquid medium which is easy to crystallize and solidify and has solid particles can be measured by the diaphragm pressure gauge. However, because the diaphragm pressure gauge realizes pressure transmission through sealing liquid, it inevitably has some shortcomings. Therefore, the self-expansion of the sealing liquid at high temperature will have an impact on the indicated value of the pressure gauge. When the temperature increases, the pressure felt by the pressure gauge will increase, which is more obvious for the diaphragm pressure gauge with low range.

Diaphragm pressure gauge can adapt to all kinds of harsh measurement environment, it works in the state of being isolated from the medium, and it also has the characteristics of high precision, wide measurement range, large selection space and diversified internal structure. Diaphragm in diaphragm pressure gauge is to protect the internal structure and original parts of the pressure gauge from damage, so the diaphragm is definitely suitable for measuring corrosive media, media containing impurities and high temperature media.

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