Maintenance
FLOWSIC100 · Operating Instructions · 8012513/YSA5/V 2-1/2016-07 · © SICK Engineering GmbH 163
Subject to change without notice
5.4 Maintaining the external purge air unit option
The following work is only necessary when 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 element
The dust load and wear on the filter element 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 inspecting the purge air unit after start-up at short intervals (1 to
2 weeks) after start-up and then optimizing maintenance intervals over a longer period of
operation.
The filter element must be exchanged when:
● High contamination is visible (deposits on the filter surface)
● Purge air flow is reduced considerably compared to operation with a new filter element
5.4.1 Inspection
Check the running noise of the blower at regular intervals; increases in the noise level
can indicate a blower failure.
Check hoses are secure and free of damage.
Check the filter element for contamination. If the filter element is excessively contami-
nated, remove it, clean the filter housing, and fit a new filter element.
NOTICE:
● Irregular or insufficient maintenance of the purge air supply can cause it to
fail and thus severely damage the transducers!
● The purge air unit must be maintained at the latest when the low-pressure
sensor on the filter outlet is triggered.
● Purge air supply must be guaranteed while the sender/receiver units are
installed. Remove the sender/receiver units from the duct before replacing
any damaged purge air hoses.
The purge air unit does not have to be switched off to clean the filter housing
or replace the filter element, i.e. sender/receiver units can remain on the duct.
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