Are ordinary thermal resistors suitable for explosion-proof areas?
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I have a question for everyone: I found in the explosion-proof area that ordinary waterproof junction boxes were being used to house thermal resistors/thermocouples, which were then connected directly to the DCS RTD card. Is this in compliance with the regulations? Are explosion-proof thermal resistors/thermocouples required, and is corrective action needed? If there are any regulations or standards, please share them. Thank you. :)
The manufacturer replied that resistors can’t explode, and asked if there are any relevant standards or specifications Thank you!
Explosion-proof devices are needed, mainly at the wiring areas.
The manufacturer replied that resistors can’t explode, and asked if there are any relevant standards or specifications Thank you!
Thermocouples and thermal resistors are generally intrinsically safe measuring elements that do not require certification; however, if they are located in an intrinsically safe area, they must pass through a P+F safety barrier before they can be connected to a DCS system.
Is there any standard? Is it feasible in Zone 2 explosion-proof areas?
Is there any standard? Is it feasible in Zone 2 explosion-proof areas?
Sure, since thermal resistor/thermocouple signals are in the millivolt range anyway, there’s no problem.
No, use explosion-proof ones, mainly referring to the wiring areas.
Was there a reply saying that the junction box needs to be explosion-proof? I’m not sure anymore – does a intrinsically safe system not require an explosion-proof junction box?