Do not connect or disconnect the sensor connector when the circuits are
energized. Switch o the power from indicating transmitter DTR external power switch
before disconnecting the sensor cable from the sensor. After connecting the sensor
cable back to the sensor, you can switch power back on.
CAUTION!
Make sure that the rated voltage is not exceeded by transient disturbances
of more than 119 V.
CAUTION!
The refractometer models PR‑23‑M, PR‑23‑MS and PR‑23‑W contain parts
made of PTFE in sensor heads. These parts are subject to electrostatic hazard. The
refractometer models PR‑23‑M, PR‑23‑MS and PR‑23‑W must only be used for
measuring liquids with high conductivity (> 10000 pS/m) in the presence of hazardous
atmospheres.
WARNING!
The painted surface of the enclosure of PR‑23‑MS refractometer is subject
to electrostatic hazard. Clean only with a damp cloth in the presence of hazardous
atmospheres.
WARNING!
Chapter 12 – PR‑23 process refractometers in potentially explosive atmosphere
221
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