Transmitter in Hazardous area

It's OK with correctly-assembled EEx i circuits, provided the intrusion doesn't involve its contact with any energy-storing devices. Otherwise don't do it without a working gas monitor and a Hot Work Permit.

Don't do it without a working gas monitor and a Hot Work Permit on any other circuit.

If it is intrinsically safe circuit installed in Hazardous area, the supply coming from non-hazardous area may be non-safe and the intrinsic safe circuit may be placed in Ex d housing. In this case, you must not open the housing cover, with power supply ON.

With any ATEX EXia or ib certified enquipmenet you can work on the live in the hazaradous area. The barriers aor galvanic isolators limit the currnt and voltage out the field instrument. Anyt other type of protection used in the hazaradous area for and electrical or instrument equipment, then as said its gas detection and spark / hot work permits. Or power the equipment off first and follow the manfactures instructions and certification for the hazaradous area, leaving time for any stored energy to disipate. I would also recommend you should have formal training before working on this type of equipment and hazarodus areas, its people lives you are dealing with first, then plant and products.. one little spark could be national news as well as a court visit etc.

THough the Intrinsic circuit is ATEX certified, if it is being powered by un safe power supply, you can not work on it in hazardous locations.

Normally in such case, un-safe power supply (non intrinsically safe) powers the Intrinsically safe barrier and the outputs of the barrier, which are intrinsically safe, power the sensors open in hazardous area. In this case the barrier itself is mounted in Ex d housing. You can not open this Ex d housing while energizes, in hazardous areas.

As well as gas detection monitor any multimeters/signal generators that you use to calibrate the transmitter in situ should be IS certified.

Hello All,

Thanks for your valuable comments. Is there any literature available on internet for this topic? Can you please send the link?

Thanks

you can work on 460 volt arcing devices in a hazardous area, no published standards disallow it. Its up to you to clear the curcuit, check for hazardous atmoshere, have a back up, in otherwords, have an administrative proceedure and plan.