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.
If you have any machine in a hazardous area then you need to prevent any possibility of explosion by way electrical energy.
There are various ways of achieving this - using intrinsically safe barriers being one of them.
I get the impression you need a Hazop Study to determine the best solution.
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.
ASCO solenoid valves have I/S models
You should make sure that you only use barriers and sensors together whose safety-related data and function-related data match each other.