The 5531 indicator is powered by the 4 to 20 mA current loop and is easily scaled to display the correct process value.
Because it does not require separate power wiring, the 5531 is perfect for remote display of process loops.
The 5531B can be mounted in Ex Zone 1.
The 5531B1 Ex display includes the 8501 enclosure and can be mounted in Ex Zone 2 or 22 (gas or dust).
The 5531B2 includes the 8501 enclosure and can be mounted in Ex Zone 1, 2, 21 or 22 (gas or dust).

Datasheet