Best Quality intrinsically safe barrier 4-20ma

There are many parts in the Explosion-Proof Relay Isolated Barrier, for example, the metal casing of the equipment, the metal shield, the related wires on the printed circuit board, the isolation plug of the plug-in device and the diode safety barrier, etc., which need to be reliably grounded. Some of these grounds are protective grounding and some are functional grounding. Whether for Marine Plant Level Gauge, or for functional grounding, sometimes, for convenience, some plug-in devices are...