Can anybody explain the specifics of following ATEX Ex marking of a field instrument:
Ex ia d IIC
Does the"d" mean that the "barrier/isolator" is included and contained within an Ex d enclosure in the field equipment?
Any answer will be appreciated
Means that it is certified for IS and flame-proof applications. Many field instruments are certified for general purpose, IS and flame-proof; therefore only 1 model # is required.
There is no barrier included or required in the instrument.
If you are going IS, a suitable barrier is required in the non-classified area. Check the data sheet and manual for the instrument.