YXC-100 electric contact pressure gauge

Electric contact pressure gauges are widely used in petroleum, chemical industry, metallurgy, power stations, machinery and other industrial sectors or in supporting electromechanical equipment to measure the pressure of various fluid media without explosion hazard. Usually, when the instrument is used in conjunction with corresponding electrical devices (such as relays and frequency converters, etc.), it can automatically control and send signals (alarms) to various gases and liquid media with measured (controlled) pressures through the instrument.

Chinese name electric contact pressure gauge

Working voltage 380VAC; 220VDC

Maximum working current 1A

Continuous current 0.6A

Overview

Electric contact pressure gauges are widely used in petroleum, chemical industry, metallurgy, electric power, machinery and other industrial sectors or in supporting mechanical and electrical equipment to measure the pressure of various fluid media without explosion hazard. The instrument has been used with Corresponding electrical devices (such as relays and frequency converters, etc.) can be used to achieve automatic control and signaling (alarm) for the pressure system being measured (controlled).

Structural Principle

The electric contact pressure gauge consists of a measuring system, an indication system, a magnetically assisted electric contact device, a shell, an adjustment device and a junction box (plug holder). Generally, electric contact pressure gauges are used to measure the positive and negative pressures of gases and liquid media that do not corrode copper and copper alloys. Stainless steel electric contact pressure gauges are used to measure the positive and negative pressures of gases 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 automatic control alarm.

The electric contact pressure gauge is based on the spring tube in the measuring system. Under the pressure of the measured medium, the end of the spring tube is forced to produce a corresponding elastic deformation and a displacement. The pull rod is driven by the gear transmission mechanism and is Zoom in, and the measured value will be indicated on the dial by the indication on the fixed gear (together with the contact). At the same time, when it contacts (opens or closes) the contact (upper limit or lower limit) on the setting pointer, the circuit in the control system is disconnected or connected to achieve automatic control and development. The purpose of calling the police.

Electrical Principle

Take the control of the compressor motor as an example: when the gas storage pressure reaches the lower limit, it automatically turns on, and when it reaches the upper limit, it automatically stops.

The control process is as follows: when the pressure reaches (or is lower than when starting up) the lower limit, the movable contact of the electric contact pressure gauge (the common terminal of the power supply) is connected to the lower limit contact, and the relay J1 acts and automatically Lock, its normally open contact is closed to drive J3, and the motor is powered to run. When the pressure reaches the upper limit, the movable contact is connected with the upper limit contact, relay J2 operates, its normally closed contact is disconnected, cutting off the power supply of J1, its normally open point is disconnected, J3 is released, and the motor stops. In this way, the purpose of automatic control is achieved.

Product Type

In view of the fact that this series of instruments not only has the characteristics of novel design, reliable structure, complete varieties and specifications, good action stability and strong adaptability, but also has the characteristics of measurement and control, It has the advantages of simple installation and low maintenance. Therefore, it generally has no instructions and no switching errors.A pressure measurement and control instrument unrivaled by pressure controllers with no adjustment and external setting devices.

In order to meet the different requirements of the objects being measured (seismic resistance or corrosion resistance and explosion-proof requirements), you can choose a shock-resistant electric contact pressure gauge or a corrosion-resistant electric contact pressure gauge or an explosion-proof electric contact pressure gauge that meets the requirements. wait.

Ordinary electric contact pressure gauges are suitable for measuring the pressure of gases and liquids that have no corrosive effect on copper alloys and iron.

Anti-corrosion electric contact pressure gauge. The main pressure measuring components and instrument casing are designed with stainless steel materials. It is suitable for measuring the pressure of highly corrosive gases and liquids.

The anti-corrosion and shock-resistant electric contact pressure gauge fills the meter body with oil and uses liquid damping to ensure a vibration-free display. It is suitable for measuring places with strong pulsation of the medium and large environmental vibrations.

Explosion-proof electric contact pressure gauge is suitable for hazardous places with explosive mixtures in the environment.

Installation method:

1 · Radial direct installation

2 · Axial direct installation

3 · Radial belt directly from the front Installation

4. Install directly in front of the axial belt

Verification

1. The electric contact pressure gauge is actually a circuit switch controlled by the pressure gauge, which is just an ordinary There is an additional electrical contact signaling device on the pressure gauge. Therefore, the calibration of the pressure part is the same as the calibration of an ordinary pressure gauge. It is just that after the pressure part is qualified, the calibration of the electrical contact signaling device still needs to be added.

2. Steps for calibration of electric contact pressure gauge

Install the pressure gauge on the calibrator, use a needle dial to move the two signal contact pointers beyond the upper and lower limits respectively, and then Carry out indication verification. After the indication value is qualified, set the upper and lower limit signal contact pointers at more than three different calibration points, and slowly increase or decrease the pressure until the moment when the signal is sent. At this time, the reading of the standard pressure gauge and the signal The deviation between the pointer indications shall not exceed the absolute value of the allowable basic error.

Product Application

The electrical contact signal pin of the electrical contact pressure gauge device is equipped with an adjustable permanent magnet, which can increase the contact suction and speed up the contact action, thereby making the contact The point contact is reliable, eliminates arcs, and can effectively prevent the instrument from frequently shutting off the contacts due to vibration in the working environment or pulsation of medium pressure. Therefore, the electric contact pressure gauge has the advantages of reliable action, long service life, and large contact switch power.

Handling of common problems

The electric contact pressure gauge generates a signal too early or too late:

The contact position is incorrect or the contact metal rod is loose. If the contact position is incorrect, adjust the contact vertically until the signal is properly generated. If the metal rod of the contact point is loose, you should try to tighten it. If it is relatively minor, it is also effective to use an appropriately enlarged hairspring to increase the reaction torque of the hairspring.

The electrical contact device does not generate a signal: the contacts are too dirty and the contact is poor; the insulation layer of the signaling device is damp; the circuit is blocked, etc.; the contacts are too dirty, use sandpaper to remove the dirt; the insulation layer is damp, blow with hot air dry; the circuit is notIf it is connected, find the broken circuit and repair it.