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What is difference between loop and zone ?

Answer Posted / dsa

Zones are based on hazardous area classifications, zones r catergorized based on explosive gases which could be present in the area. 
Loop are basically open or closed. Basically in instrumentation a loop is defined from the starting point which is sensor to the end point I.e system. This irrelevant to whatever system u use. 
If your question isn't answered kindly elaborate or provide more details and not just ask general questions!

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