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I work in the middle east, and I see awful practices being performed every day. I do not profess to be an expert in the instrumentation side of things.
But I was concerned when I saw an instrument guy opening the cover of a Ex device in a hazardous location. When I approached him, he said "it's OK, there is a barrier to limit the power and prevent sparks."
Hell, even the device itself has labelled on the cover - DO NOT REMOVE IF CIRCUIT IS ALIVE. I am pretty sure BOTH barrier and device need to be Ex; the barrier manages power/shorts, and the device can store energy (hence why you shouldn't remove the housing).
Can someone provide a nice, technical explanation on my limited understanding of WHY the cover shouldn't be removed? What dangers are there if a barrier is "there to limit the power and prevent sparks."
Appreciated thanks.
But I was concerned when I saw an instrument guy opening the cover of a Ex device in a hazardous location. When I approached him, he said "it's OK, there is a barrier to limit the power and prevent sparks."
Hell, even the device itself has labelled on the cover - DO NOT REMOVE IF CIRCUIT IS ALIVE. I am pretty sure BOTH barrier and device need to be Ex; the barrier manages power/shorts, and the device can store energy (hence why you shouldn't remove the housing).
Can someone provide a nice, technical explanation on my limited understanding of WHY the cover shouldn't be removed? What dangers are there if a barrier is "there to limit the power and prevent sparks."
Appreciated thanks.