The explosion-proof pressure transmitter is to change the resistance value of the explosion-proof pressure transmitter (resistance effect) by applying pressure to the measured gas or liquid, and convert the corresponding measured signal into the corresponding 4~20mA output signal or digital signal with HART protocol for communication. Explosion-proof pressure transmitters are safe and explosion-proof, and can be widely used in petrochemical, electric power, metallurgy, pharmaceutical, food processing and other industries.
Explosion-proof pressure transmitter applications for explosive hazardous locations can be divided into zones 0, 1 and 2. The so-called Zone 0 refers to the place where the explosive gas mixture exists continuously or for a long time under normal conditions; Zone 1 refers to places where explosive gas mixtures are likely to occur under normal circumstances, and Zone 2 refers to places where explosive gases are unlikely to occur under normal conditions or even exist for a short period of time. For explosion-proof pressure transmitters, the requirements for explosion protection in Zone 0 are the most stringent. The pressure transmitter can be intrinsically safe or flameproof, and it should be noted that no matter what form of explosion-proof pressure transmitter, it needs to be verified by the national explosion-proof testing department and obtain the relevant explosion-proof certificate before it can be used.
The intrinsically safe version of the explosion-proof pressure transmitter needs to be used in conjunction with a safety barrier in hazardous locations where explosive mixtures are present. Safety barriers rely on energy control to achieve explosion-proof regulations. For the sake of safety, intrinsically safe explosion-proof pressure transmitters should distinguish between intrinsically safe circuits and non-intrinsically safe circuits, and separate the wiring of intrinsically safe circuits from the wiring of other electrical circuits.
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