Test I.S. Barrier,How frequently should you test them?
What is the testing procedure for one?No special maintenance of intrinsically safe systems is required. Once a year the barriers should be checked to ensure that the connections are tight, the ground wiring has less then one ohm of resistance, and the barriers are free from moisture and dirt. Check the panel and conduits for separation and identification of the intrinsically safe wiring. Never test the barrier with an ohmmeter or other test instrument while it is connected in the circuit (see figure 11). This bypasses the barrier and could induce voltages into the intrinsically safe wiring.
No testing is needed.  Just installation check valves.  I once showed up to a sterilization plant to install new controls.  They had all the IS wiring sharing a raceway with 480Vac..

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