Sensor Replacement - MSA Sirius Mode D'emploi

The instrument displays an error code if it detects a problem during
startup or operation. See TABLE 6-1 for a brief description of the error
and proper corrective action. When an inoperative component is located
by using the guidelines, it may be replaced by using one of the following
Repair Procedures.
Table 6-1. Troubleshooting Guidelines
PROBLEM
Does not turn ON
Battery pack does not
hold charge
Combustible sensor
does not calibrate
Oxygen sensor
does not calibrate
Toxic sensor
does not calibrate
Ion Error
PID Error
Failed Span Cal Error
(on PID)
PID Comm Error
PID bulb/Cal now
PID sensitivity to humidity
Noisy PID reading
CO sensor spurious signal
at high temperature
Pump alarm
Sensor missing
In all of the above cases and for any other problems, the Sirius Multigas Detector may be
returned to MSA for repairs.

Sensor Replacement

1. Verify the instrument is turned OFF.
2. Remove the battery pack.
3. Remove the four case mounting screws from the back of the case.
4. Remove the back case.
ACTION
Recharge (if applicable) or replace battery. See Chapter 4
Replace battery. See Chapter 4
Replace sensor. See Chapter 6
Replace sensor. See Chapter 6
Replace sensor. See Chapter 6
Check that ion chamber is not installed upside down.
Replace/dry chamber or clean with duster (P/N 10051715).
See Chapter 6
Check that ion chamber is installed.
Clean or replace bulb if within normal temperature range
If temperature too cold, allow instrument to stabilize
within normal temperature range before turning ON
Clean or replace bulb. See Chapter 6
Send instrument to authorized service center for repair
Clean or replace bulb and recalibrate instrument.
See Chapter 6
Clean or replace bulb/replace ion chamber. See Chapter 6
Clean/replace bulb or ion chamber. See Chapter 6
Overexposure to Isobutylene or other interferent gases.
Allow sensor to clear for 24 hours or replace CO sensor.
See Chapter 7
Check for leaks/blocks, replace dust and water filters.
See Chapters 3 and 6
Check installation of sensor/replace sensor. See Chapter 6
6-13