Does the thermistor PT100 need to be grounded?

I think that if the DCS cabinet room doesn’t have proper lightning protection measures, it doesn’t matter how well the housing of the thermal resistor is grounded.

Lightning protectors can be installed on-site.

Grounding the casing doesn’t help either; the resistor is already insulated from the casing. It’s recommended that you check the grounding of the card

Install surge protectors on-site, or use surge protectors mounted on guides within the central control circuit

　　If all the faulty ones are thermal resistors, the shielding of the signal wire routing should be given primary consideration. 　　The housing of the thermoresistor is usually grounded when it is installed on metal equipment. If it is a non-metallic device, an additional ground can be provided for the protective tube. Be careful not to connect it to the shield of the wire, as this can cause interference. 　　Thermistors, having three wires, are prone to problems during electromagnetic storms because the induced voltages along the wires cannot cancel each other out like they do in paired signal wires. 　　The section between the junction box and the wire conduit of the isolated thermistor at a high location is a common problem area. Adding metal flexible pipes can reduce the occurrence of problems. 　　If the cause cannot be found or it is not convenient to resolve the issue, a surge protector or isolation barrier can be installed.

I note that 3 DCS channels have been damaged. If that’s the case, it is recommended that you check the lightning protection system of the DCS system, rather than that of the thermal resistors. I haven’t heard that the housing of thermal resistors needs to be connected to a lightning protection system… Also, do your DCS power supplies come equipped with surge protectors? Also, is the grounding of the DCS cards done properly? Maybe next time it won’t just burn up 3 points……