Vaisala K-PATENTS PR-23 Series, Instruction Manual, Page: 201 / 246

11 Safe-Drive™ 191
11.7 Thermal cover for PR-23-SD
The thermal cover prevents heat flow between process and ambient surroundings. It
helps maintain the sensor tip and the prism surface at process temperature and may
reduce prism coating. Use thermal cover when the temperature difference between
the process and the ambient is more than 30°C or when the process temperature is
over 60°C.
1.
Pass SD shut-off valve handle through the hole provided
2.
Wrap
cover
under and around the SD valve
in the thermal
cover
, making sure the label is facing
toward you.
body aligning the cutouts with the drain valve.
1
2
3.
Close using velcro strips first the single join
on the
4.
left.
Finally the two velcro joins on the right.
3
4
Figure 11.16 Mounting the thermal cover