The refractometer system, in the following figure, for potentially explosive atmosphere locations consists of a modified refractometer sensor PR‑23‑…‑AX/FM/CS/CX/RX, a standard Indicating transmitter DTR and a sensor cable PR‑8230‑…
The ATEX/FM/CSA approved sensors PR‑23‑…‑AX/FM/CS/CX/RX are identified by the sensor nameplate, see the following figure. The indicating transmitter is a standard DTR.
The approvals are valid for sensors PR‑23‑AC, PR‑23‑AP, PR‑23‑GC, PR‑23‑GP, PR‑23‑M, PR‑23‑MS, PR‑23‑SD, PR‑23‑W and PR‑23‑RP.