Barriers for Pressure Sensors, Temperature Sensors, and Solenoids.


Thread Starter



refer my below query regarding requirement of barriers in safe area.
Suppose Compressor system will be kept in hazardous area (gas group IIA/IIB) & relay based starter cum control panel will be in safe area. Pressure sensors, temp sensors & solenoids will be mounted on compressor system.

Do I need to use safe area barriers for the pressure & temp.sensors (4-20mA) at panel incoming? reason? & whether these are also required for solenoid valves (24 v dc) reason?

please guide me.

Thanks in advance.

I think using barriers assumes the field device can be made intrinsically safe, I'm not sure solenoids fall into that category.

90% of my work is in Hazardous locations but I haven't bought a barrier in years.
You should make sure that you only use barriers and sensors together whose safety-related data and function-related data match each other.