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This is the situation:
There are too many temperature transmitter placed in safe area and they are all approved as IS (intrinsically safe). they have to be connected to Pt100 RTDs in the field placed in hazardous area Zone 1. in this case as the temperature transmitter is approved as IS do we need to place any isolator or barrier between the temperature element (PT100) and temp transmitter placed in safe area?
as another question, while the temp transmitter is certified as IS do we need other method of protection like EXD?
There are too many temperature transmitter placed in safe area and they are all approved as IS (intrinsically safe). they have to be connected to Pt100 RTDs in the field placed in hazardous area Zone 1. in this case as the temperature transmitter is approved as IS do we need to place any isolator or barrier between the temperature element (PT100) and temp transmitter placed in safe area?
as another question, while the temp transmitter is certified as IS do we need other method of protection like EXD?