FLK Gas Sampling System - MPIP - Free

SQ253 Valve Combination
4. Maintenance
4.1 General information
The user should carry out the following maintenance work so that operational readiness is ensured:
• The valve combination must be thoroughly cleaned of dust and dirt every week.
• The compressed air filter should be cleaned every month.
• A leakage test of the complete system (compressed air side and measuring gas side) must be carried out every six
months.
4.2 Compressed air filter
The compressed air filter is used for the effective separation of liquid and solid particles from the compressed air. However, it
is not intended for oil separation.
The air flows in the direction of the arrow through the filter and is made turbulent by the
guide vane A. The particles of liquid are thrown against the internal walls and run
downwards. The separating cap B forms a calm zone which prevents the separated
condensate from being taken up again by the air flow. Then the air flows through the filter
element C. Here all solid contaminants are retained which are larger than the pore size.
When the condensate reaches a certain height, a valve is opened by the float F and the
filter is automatically drained.
With filters with manual drainage, the filter is drained by operating the drain screw E.
Clean the compressed air filter at least once per month, more often if necessary.
To do this, shut off the compressed air before the filter. Open the filter by turning
the metal container to the right and then clean it.
automatische/manuelle Entleerung
automatic / manual drainage
Fig. 4 Compressed air filter
Copyright ® SIEMENS Page 67 04/04