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Exi vs Exd transmitters in oil/gas industry

Exi vs Exd transmitters in oil/gas industry

Exi vs Exd transmitters in oil/gas industry

(OP)
Hi

I have following question. Why do we often use Exi pressure, level or temperature transmitter in II zone (methane) with appropriate Intrinsic Safety isolators whereas total cost of combination Exi transmitter with Intrinsic Safety isolators mounted in control cabinet is more expensive than Exd transmitter mounted in the field alone?

Thanks in advance for answers!

RE: Exi vs Exd transmitters in oil/gas industry

Good Question, why would you use Intrinsic Safe, I work in related industry but we seldom do any more. It's not just the hardware but to do it right special cable, dedicated trays, segregated panels.

Occasionally you strike a situation where Intrinsic Safe is the only approval you can get for a particular instrument. I'm looking at a guided wave radar in a tank with Hydrogen gas. I dare say the barriers will be somewhere close by.

I don't see Exi in the Methods of Protection list Ex ia, EX ib, Ex ic
There are so many variations in hazardous location designation, can you share the location of the project, complete hazardous zone designation?

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