Working principle of diaphragm pressure gauge

Diaphragm pressure gauge is suitable for measuring the pressure or negative pressure of various fluid media with constant corrosivity, non-solidification or non-crystallization.

Corrosion resistance depends on the diaphragm material.

The pressure guide system and shell of stainless steel corrosion-resistant diaphragm pressure gauge are all stainless steel, which has strong corrosion resistance. It is mainly used to measure the tiny pressure of gas and liquid in chemical, petroleum and textile industries, especially in corrosive and viscous media (non-solidified and non-crystallized).

The vibration-resistant diaphragm pressure gauge is filled with damping liquid and supporting buffer device, which has good vibration-resistant performance. The vibration-resistant diaphragm pressure gauge can be used to measure stably when the pressure of the measured medium has a strong pulse change or pressure shock and is often suddenly unloaded in the production process, as well as in places with large environmental vibration.

The corrosion-resistant and shock-resistant diaphragm pressure gauge has the characteristics of both corrosion-resistant and shock-resistant diaphragm pressure gauges.

Structure principle of diaphragm pressure gauge;

The instrument consists of measuring system (including flange joint and corrugated diaphragm), transmission indicating mechanism (including connecting rod, gear transmission mechanism, pointer and dial) and shell (including watch case and cover ring). The instrument shell is a splash-proof structure with good tightness, so it can protect its internal mechanism from contamination.

The function principle of the instrument is based on the deformation of the elastic element (diaphragm on the measuring system). Under the pressure of the measured medium, the diaphragm is forced to produce corresponding elastic deformation-displacement, which is amplified by the transmission mechanism of the connecting rod group, and the measured value is indicated on the dial by the pointer fixed on the gear.

Working principle of electric contact pressure gauge

Before understanding the working principle, make clear its composition: the electric contact pressure gauge consists of measuring system, indicating system, magnetic auxiliary electric contact device, shell, adjusting device and junction box (plug and socket). The universal electric contact pressure gauge is used to measure the positive and negative pressures of gas and liquid media which are not corrosive to copper and copper alloys. Stainless steel electric contact pressure gauge is used to measure the positive and negative pressures of gas and liquid media that do not corrode stainless steel. When the pressure reaches a predetermined value, it sends out a signal and turns on the control circuit to achieve the purpose of automatically controlling the alarm.

The pointer and setting pin of the electric contact pressure gauge are equipped with contacts respectively. When in use, first adjust the upper and lower setting pins to the required pressure point. When the pressure changes, when indicating that the pressure pointer reaches the upper limit or lower limit setting pin, the contact on the pointer contacts with the contact on the upper limit or lower limit setting pin, and the switch signal realizes the purpose of automatic control or alarm through the circuit.

Based on the pressure of the measured medium, the electric contact pressure gauge forces the end of the spring tube to produce corresponding elastic deformation and displacement, and at the same time, it is driven and pre-amplified by the pull rod through the gear transmission mechanism. The measured value is displayed on the dial through the indication on the fixed gear (displayed together with the contact). At the same time, when it is in contact (off or on) with the contact (upper or lower limit) of the set pointer, the circuit in the control system can be disconnected or connected to realize automatic control and transmission. The purpose of the alarm. Take the control of compressor motor as an example: gas storage and filling pressure will automatically start when it reaches the lower limit, and will automatically stop when it reaches the upper limit. The control process is as follows: when the pressure reaches the lower limit (or when it is low and open), the movable contact of the electric contact pressure gauge (the common end of the power supply) is connected to the lower limit contact, the relay J1 works and locks itself, the normally open contact is closed, J3 is driven, and the motor is powered on. When the pressure reaches the upper limit, the movable contact is connected with the upper limit contact, the relay J2 works, its normally closed contact is disconnected, cutting off the power supply of J1, its normally open point is disconnected, releasing J3, and then the motor stops. This reciprocating motion achieves the purpose of automatic control.

Structure principle of precision pressure gauge

The instrument consists of a measuring system indicating part and a shell part. The instrument has good sealing performance and is equipped with sealing inspection device, which can protect its internal measuring mechanism from mechanical damage and pollution immersion.

The principle of the instrument is based on the elastic element to measure the deformation of the spring tube in the system. Under the pressure of the measured medium, the end of the spring tube is forced to produce corresponding elastic deformation-displacement, which is driven by the pull rod through the gear transmission mechanism and amplified, and the measured values are indicated on the dial one by one by the pointer fixed on the gear shaft.

pressure gage

Main technical indexes of precision pressure gauge

Accuracy/accuracy grades: 0.4 and 0.25.

Instrument connection: standard thread M20 X1.5 (optional)

Hands: 65Mo manganese black blade type

Environmental conditions: 5 ~ 40℃, relative humidity not more than 80%, and environmental vibration and fluctuation of pressure source have no effect on the accurate reading of the instrument.

Temperature influence: If the ambient temperature deviates from 20 3℃ Type A or 20 2℃ Type B, the additional temperature error of 0.4%/10℃ shall be considered.

Weight: 1kgA type A and 1.4kgB type B.

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