MSA SIRIUS Instruction Manual page 44

7 Warranty, Maintenance, and Troubleshooting
6. Replace the O-ring, being sure to press gently down on top of the water filter.
NOTE:
When replacing the water filter, carefully handle the new filter by the edges only, as it is
easily torn. Install the filters in the correct order.
• If the case oval-shaped O-ring comes out inadvertently when changing the filters
replace it in the oval-shaped groove in the back case before replacing the filter
housing (see Figure 24).
Figure 24:
Case Oval-shaped O-ring
7. Re-install the filter housing and tighten the screw.
8. Check the system for leaks by plugging the inlet with a finger.
• A pump alarm must sound. See 3.9 Verifying Pump Operation.
WARNING!
Do not use the pump, sample line, or probe unless the pump alarm activates when the
flow is blocked. Lack of an alarm is an indication that a sample may not be drawn to the
sensors, which could cause inaccurate readings.
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CASE OVAL SHAPED
O-RING