Sensor Replacement - MSA SIRIUS Manuel D'instructions

7.9 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.
5. Gently lift out and properly discard the sensor to be replaced.
• Use a flat-blade screwdriver to pry the CO and/or H
6. For the combustible and/or O
appropriate sockets on the (lower) printed circuit board. Press gently into position.
• If a combustible and/or an O
appropriate opening in the sensor gasket is sealed with a sensor cover label (tape
disc) (P/N 710487).
7. For the CO and/or H
• The CO sensor has a filter disc attached to it. Be careful not to damage the filter
disk during handling and installation. Be sure the filter disk is facing upward when
installed.
• The H S sensor is marked "H
2
gas inlet hole face upward when installed.
• If a CO and/or an H
plug" (P/N 10046292) is installed properly in its place.
NOTE:
The CO and H S sensor positions must not be swapped. Verify that they are in the
2
proper holder as indicated on the (upper) printed circuit board.
LEL
O
2
Figure 25: Sensor Locations
Warranty, Maintenance, and Troubleshooting
sensor, carefully align the new sensor pins with the
2
sensor is not to be installed, ensure that the
2
S sensors, carefully press them into their appropriate socket.
2
S" on its top side; ensure that the "H
2
S sensor is not to be installed, ensure that an "inactive sensor
2
H S
2
CO
S sensors from their holders.
2
S" mark and
2
7
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