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8009389/YN39/V3-0/2015-08| SICK OPERATING INSTRUCTIONS|GM35
Subject to change without notice
MAINTENANCE
5 Make sure cables are not damaged along the whole length and connections are not
loose, and check cables for corrosion and humidity.
6 Check the purge air hose carefully for damage. Pay special attention to points subjected
to mechanical strain, such as on the hose clamps.
7 Check all remaining hose clamps on the purge air hose, purge air unit, and hose piece of
the pressure difference sensor (option) to ensure these are secure, and tighten if
necessary.
8 Pay particular attention that the dummy plug, which seals the second purge air outlet on
some purge air unit versions, is securely in place.
9.4.4 Checking and replacing the purge air filter
The frequency with which the purge air filter has to be replaced depends on the dust
content or contamination of the ambient air. Replacement is necessary at the latest when
the low-pressure monitor at the filter outlet trips and signals a filter change is necessary.
In newly installed measuring systems, it is recommended to remove the filter element dur-
ing the very first maintenance to check the level of contamination. This result helps to
determine the filter replacement frequency.