Explosion-proof electric contact pressure gauge
Basic introduction
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The explosion-proof category of the instrument is Class II explosion-proof type B-class T4 group, and its mark is Ex
Explosion-proof electric contact pressure gauge
Explosion-proof electric contact pressure gauge
dIIBT4.
The instrument is suitable for measuring the pressure of non-crystalline, non-solidified explosive mixtures or various non-explosive media in places with explosion hazard.
The instrument can realize the purpose of automatic control and signaling (alarm) to the controlled system after being used in conjunction with electrical devices (such as relays and contactors) that have corresponding explosion-proof performance or take corresponding safety measures.
Technical indicators
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Accuracy class: 1.5
Explosion-proof electric contact pressure gauge
Scale range : 0～0.16; 0～0.25; 0～0.4; 0～0.6; 0～1; 0～1.6; 0～2.5; 0～4; 0～6; 0～10; 0～16; 0～ 25; 0 to 40; 0 to 60; -0.1 to 0.06; -0.1 to 0.15; -0.1 to 0.3; -0.1 to 0.5; -0.1 to 0.9; -0.1 to 1.5;
Control mode: upper and lower limit jogging contact switch
Maximum working voltage: DC 220V or AC 380V;
Contact power: 10VA
Working position: vertical installation
Operating environment conditions: -10～50℃, relative humidity not more than 80%, and the explosive mixture should belong to the IIB class T4 group or below, the working vibration and the sharp pulsation of the measured medium should not affect the reliable action of the instrument contacts.
Temperature influence: the indication value is not more than 0.4%/10℃, the set point is not more than 0.6%/10℃ (the operating temperature deviates from 20±5℃).
Dielectric strength: 50Hz sinusoidal alternating current 2000V for one minute
Weight: 6kg
· Types of flameproof joints and their basic parameters
Structural Principles
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Explosion-proof electric contact pressure gauge
The instrument is composed of flameproof casing, measurement system, electrical contact group, adjustment device and outlet box. The flameproof shell of the instrument has good flameproof performance, so it can effectively withstand the explosion pressure generated by the explosive gas mixture inside the shell due to the influence of sparks or arcs during normal operation. The resulting heat energy can be prevented from spreading smoothly outwards, but can only be slowly diffused outwards along the tiny gaps of the flameproof joints inside the casing. At this time, the instantaneous temperature transmitted to the outside of the casing has been reduced to below the ignition temperature of the explosive gas mixture, so it will not cause detonation.
Explosion-proof electric contact pressure gauge
The working principle of the instrument is based on the elastic deformation of the detection element (the spring tube in the measurement system), which drives the contacts in the electrical contact group to produce corresponding actions (close or open) through mechanical transmission to make the voltage in the pressure control system. The circuit can be turned on or off, so as to realize the purpose of automatic control alarm and on-site indication.
