Do explosion-proof instruments need safety barriers?
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As the question states, does the explosion-proof instrument have to be connected to a safety barrier, or can it be connected directly to the AI card of the PLC without a safety barrier? Are there any regulations in this regard?
I think it is not necessary to connect the safety barrier, and it is no problem to connect it. Many pseudo-experts who need to do on-site inspections for explosion-proofing in this case do not understand the explosion-proof and safety barriers in this case. They only know about explosion-proofing.
No, only required for intrinsically safe circuits
It's explosion-proof. What's the use of that thing? Does it divide signals?
If you have a lot of money, there is no problem in connecting it, but it is not the same kind of safety barrier as the intrinsically safe one.~
The control side of the intrinsically safe instrument can directly enter the IO module without connecting the safety barrier.
You are talking about when intrinsically safe instruments are not used as intrinsically safe instruments;P
Intrinsically safe must be connected. Explosion-proof can be connected or not, generally not connected to save costs.
If you connect the wires according to the explosion-proof requirements, the pipelines will not need safety barriers, right?； If it is not connected according to the explosion-proof specifications, the explosion-proof will have no effect, and the safety barrier will not have much effect.