Figure 9.37 Warning scker
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 hazard. The refractometer models PR-23-M,
PR-23-MS and PR-23-W shall only be used for measuring liquids with high conductiv-
ity (> 10000 pS/m) in the presence of hazardous 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 mounng
Choose the mounting location of the sensor, the isolator/barrier unit and the indicat-
ing transmitter/MI 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 K-Patents 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 Figures 9.39 and 9.40.
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