What is the difference between transmitter intrinsically safe instruments and other instruments?
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For a project under construction, we plan to install differential pressure transmitters, but since they are intrinsically safe, is there any problem with installing them directly on site? Some people say that intrinsically safe instruments cannot be used in chemical plants and that safety barriers are necessary – what does that mean?
If it is to be used in explosion-proof environments, the specific explosion-proof standards must be taken into account. To achieve intrinsically safe operation, a merely intrinsically safe transmitter is not sufficient; it must be connected together with a safety barrier and intrinsically safe cables. If it is to be used as a regular, non-explosion-proof instrument, then it can be connected in the usual manner.
In explosion-proof environments, an intrinsically safe circuit must be established; this circuit is composed of intrinsically safe instruments and safety barriers.
If the installation location is in an explosion-proof area, the differential pressure transmitter must be intrinsically safe; the transmission cable should also be intrinsically safe. A safety barrier must be present within the DCS/PLC system cabinet. An intrinsically safe gauge, intrinsically safe cable, and safety barrier together constitute an intrinsically safe circuit. The differential pressure transmitter is intrinsically safe; the other field remote transmission instruments may also be intrinsically safe instruments – please refer to the design specification documents and drawings. If the installation location is a non-explosion-proof area, it can be installed as a regular differential pressure gauge; then why buy this ammonia-specific gauge? I need to ask the instrument designer. When installing a differential pressure transmitter, be careful with the high-pressure side and the low-pressure side – installing them incorrectly can cause trouble.