Instrumentation in hazard area

I am not well versed with Divn Classfn ,

However For Zonal Classfication You may follow the following ,

For Zone 0 -Only Intrnsically safe ( Ex-ia) protection

For Zone 1 Exd ( Explosion Proof or Ex-ia)

can be used.

IEC 60079 & NEC Article 70 Section 505, Provides guidelines for selection of protection of Instruments

Regards

Jose John

Hi there,

There are standards that govern this. You will need to start with the standards that govern your country. In South Africa this is SANS, they use the same standards as IEC. You can also look at ISA as a starting point.

If you understand the basics i.e. < x Joules / Watts per loop - you are on your way.

Regards,

Craig

http://en.wikipedia.org/wiki/Electrical_equipment_in_hazardous_areas

Be aware that selection of equipment for hazardous areas requires some training, and is not a topic for the uninitiated.