12. Tighten the rotary handle clockwise.
13. Refit the weather hood.
10.10.1.2
Replacing the non-return valves
Overview
Figure 18: Gas sampling unit
There are two non-return valves installed below the sheet metal trim in the valve block.
Procedure
1.
Remove the 90° screw-in fittings and insulation.
2.
Fit new valves with Teflon tape.
NOTICE
Observe the alignment of the non-return valves!
•
Arrow must point in housing direction.
10
MAINTENANCE
78
O P E R A T I N G I N S T R U C T I O N S | MARSIC280
8021339/1CHC/V1-1/2021-07 | SICK
Subject to change without notice