Thermal resistor explosion protection issue

All instrument and electrical equipment within the explosion-proof area must be designed to be explosion-proof, typically using intrinsically safe or flameproof designs; such protection is not required outside of the explosion-proof area.

Because your thermal resistor also generates electricity; when there is electricity present in an explosion-proof area, explosion protection must be taken into account, as electric sparks can occur

This post was last edited by Sai Xin on 2022-2-11 at 15:25. I used to work for several foreign companies that manufacture temperature sensors; now I run a thermometer factory with my friends. I also asked foreigners about this issue, and their reply was as follows: Thermocouples and thermal resistors are inherently intrinsically safe, so there’s no need to consider explosion protection； However, there are many other instruments at a chemical plant site that may generate sparks or require explosion-proof design. If this chemical plant explodes, the insurance company will have to provide compensation and investigate who is responsible ； Manufacturers of (instrumentation) devices that have explosion-proof certifications will of course all pass, with no liability involved ； It was time to check the thermistor thermometer, and it turned out to lack an explosion-proof certification; oh, it’s just meant to take the blame. . Therefore, when the cost of obtaining certifications is not high, manufacturers of thermal resistors and thermocouples prefer to spend the money on such certifications in order to avoid various responsibilities. Foreign thermometer manufacturers likely act in this way; domestic manufacturers, on the other hand, simply copy what foreigners do, especially design institutes – once they see that foreign thermal resistor and thermocouple products come with explosion-proof certifications, they also start requiring explosion-proof features

Electric sparks may be generated at the terminal connections; without explosion protection, encountering flammable gases could lead to fire and explosion

Intrinsic safety and explosion protection are two different things. It cannot be confused. If there is electricity, wiring terminals, and an explosion-proof requirement, then explosion protection is necessary