Intrinsically Safe Mounting - Vaisala K-PATENTS PR-23 Series Instruction Manual

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Warning! Do not replace any part of an intrinsically safe sensor with a
standard sensor part.
Important: If the sensor cover is made
of aluminium, the refractometer sensor
can cause ignition if it hits other metal
parts during the installation. An alu-
minium sensor cover must have a sticker
warning about this possibility.
Important: The refractometer models
PR-23-M, PR-23-MS and PR-23-W con-
tain parts made of PTFE in sensor heads. These parts are subject to electrostatic haz-
ard. 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 haz-
ardous atmospheres.
Important: The painted surface of the enclosure of PR-23-MS refractometer is sub-
ject to electrostatic hazard and therefore the cleaning shall be done only with a damp
cloth in the presence of hazardous atmospheres.

9.11.2 Intrinsically safe mounting

Choose the mounting location of the sensor, the isolator/barrier unit and the indicat-
ing transmitter so that they are protected from sudden impact and friction. If any of
the system parts are affected by a sudden impact, power off immediately and have the
system checked by trained Vaisala service personnel before it is used again.
The electrical connections for PR-23-...-IA are described in Figure 9.38. The electrical
connections for PR-23-...-IF are described in Figure 9.39.
Figure 9.36 Intrinsically safe parts
PR-23 instruction manual
PR-10300-Ex
terminator card
PR-10101-Ex
processor card
Contains lightmetals
Ignition hazard!
Avoid impact!
Figure 9.37 Warning sticker