5.1
SECTION 5 ROUTINE MAINTENANCE
5.1 Replacing fan filter element
The external fan filter element should be checked every six months in laboratory conditions, for
environments with a high dust content this period should be reduced. The filter element is
washable and in laboratory or light dust conditions may be washed and refitted rather than
replaced.
• Remove power from the analyser and unclip the filter cover complete with filter
element and plastic gauze.
• Remove the plastic gauze and old filter element from the cover.
• If necessary cut new filter element to size and fit into cover followed by plastic
gauze.
• Clip cover back onto fan.
5.2 Replacing the sample filter element
The front panel sample filter elements should be replaced every six months. External filter
elements may be replaced annually, or more frequently if necessary.
1. Stop sample flow to analyser.
2. Use spanner (provided for front panel filter) to unscrew sample filter cap. Support the
body of the external unit as necessary.
3. Remove old filter element and, on front panel filters only, the rubber 'O' ring. (The external
element may be tapped lightly on the side to break it loose from the tapered seating area).
4. Fit new sample filter and (internal units only) rubber 'O' ring. Check that rubber 'O' ring is
properly seated on the filter cap. (The external element should be tapped lightly with a
smooth faced tool to reseat).
5. Fit sample filter cap and tighten using spanner.
6. Verify that there are no leaks by testing with a proprietary leak detection solution.
CAUTION
After washing the filter, ensure that it is completely dry before refitting.
WARNING
Sample and calibration gases may be toxic or flammable. Stop sample flow into
analyser to avoid releasing gas into atmosphere when sample filter cap is removed.
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