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 shall 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 and therefore the cleaning shall be done only with a damp cloth
in the presence of hazardous atmospheres.
WARNING!
10.10.2 Intrinsically safe mounting
Choose the mounting location of the sensor, the isolator/barrier unit and the indicating
transmitter so that they are protected from sudden impact and friction.
If any of the system parts are aected by a sudden impact, power o
immediately and have the system checked by trained Vaisala service personnel before it
is used again.
CAUTION!
The following figures describe the electrical connections for PR‑23‑…‑IA/‑CI and the
electrical connections for PR‑23‑…‑IF.
Chapter 10 – Sensor specifications
165
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