Explosion Proof RTD's

[danw2]

I must have missed a previous thread, RTD's Intrinsically Safe,
Link
Just found it in a search.

(Keith) >Never seen an ExP RTD before. Seems likely to lag the poor thing horridly. I could see them wanting to change out ExP for two reasons. One would be having to run the requisite thick-wall conduit and bulkhead plugging hassles and the other would be maybe needing a more responsive sensor.
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There's no lagging on the sensing element. Because the RTD is a 'simple apparatus', it's the screw cover head that is Class 1, Div 1 rated, not the sensing element.

 

[mparenteau]

Are you looking at a RTD or heat trace? In the past, I would spec a RTD in a thermowell. Then we would use C1, D2 wiring methods. If the "probe" had direct contact w/ a process, then I would go w/ IS.

Mike