Operating Instructions FLOWSIC100
Gas Velocity Monitor
Maintenance
8012513/03-2008 © SICK MAIHAK GmbH · Germany · All rights reserved 129
5.5 Maintaining the Extern Purge-air Unit Option
The following activities are only necessary, if purged sender/receiver units (types FLSE100-
PM, PH, PHS) are used. Maintenance activities are:
• inspecting the purge-air supply,
• cleaning the filter housing,
• replacing the filter insert.
The dust load and wear on the filter insert depend on the degree of contamination of the
intake ambient air. For this reason, specific intervals for carrying out these activities cannot
be given. We recommend that you inspect the purge-air unit after commissioning at short
intervals (1 to 2 weeks) after commissioning, and then optimize the maintenance intervals
over time.
The filter insert must be exchanged if:
• high contamination (deposits on the filter surface) are visible,
• the purge-air flow is reduced considerably in face of the operation with a new filter
element.
Important
• Irregular or insufficient maintenance of the purge-air supply can cause it to fail and thus
damage the transducers irreparably.
• The purge-air must be maintained at the latest when the low-pressure monitor on the
filter outlet is triggered.
• The purge-air supply must be guaranteed while the sender/receiver units are installed.
Remove the sender/receiver units from the duct before you replace any damaged purge-
air hoses.
Note: You do not have to switch off the purge-air unit to clean the filter housing or replace the filter
insert. In other words, the sender/receiver units do not have to be removed from the duct.
5.5.1 Inspection
‡ Check the running noise of the fan at regular intervals; increases in the noise level can
indicate a fan failure.
‡ Check that the hoses are secure and free of damage.
‡ Check the filter insert for contamination. If the insert is excessively contaminated,
remove it, clean the filter housing, and fit a new insert.
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