Replacing The Ion Chamber - MSA SIRIUS Manuel D'instructions

7 Warranty, Maintenance, and Troubleshooting
16. Never touch the lens surface with your fingers. If contact occurs, repeat steps 6
through 13.
17. Gently insert the clean bulb, window first into the bulb sleeve of the instrument.
Do not apply excessive pressure when seating the bulb. Too much pressure
may damage the detector and/or the bulb.
18. Push the open end of the rubber bulb holder onto the tip of the bulb. Gently push it on
until it is fully seated.
19. Before replacing the bulb access cap, ensure the o-ring that goes around the bulb
sleeve is in place. Replace the bulb access cap and tighten with a coin until it
completely bottoms (no longer turns).
• If using the tamper-resistant bulb access cap, the special tool provided with the
cap must be used.
NOTE:
Failure to tighten the bulb access cap fully may result in leakage in the flow system,
causing inaccurate readings.
20. Turn ON the instrument and check the system for leaks by plugging the inlet with
your finger.
• The pump alarm should sound immediately. See 3.9 Verifying Pump Operation.
21. In a clean air environment, do a fresh air setup.
22. Allow the instrument to run for at least 15 minutes for the bulb to stabilize.
23. Recalibrate the instrument according to 6. Calibration.
NOTE:
If a PID Failed Span Cal still occurs or an acceptable calibration cannot be performed,
replace the PID bulb with a new one.

7.4 Replacing the Ion Chamber

Replace the ion chamber:
• when Changes in RH (wet to dry and dry to wet) cause erratic VOC readings with no
analyte present
• if a PID Failed Span Cal still occurs after bulb replacement.
Use the Ion Chamber Replacement Kit (P/N 10050783).
NOTE:
Remove and re-install the ion chamber in a clean, non-hazardous environment.
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