25 • Maintenance 01 Series Operator’s Manual
4. Carefully remove the old sensor from the sensor socket.
5. Carefully insert the replacement sensor in the socket. Make sure the
sensor face with the colored ring is facing up.
CAUTION: When replacing the sensor, verify that the sensor is properly
aligned with its socket before inserting it into the socket. The
CO and H2S sensors have alignment slots which match up
with alignment tabs in the sockets. Forcing a sensor into its
socket may damage the sensor or the socket.
6. Reinstall the sensor retainer.
7. Allow 10 minutes for the new sensor to stabilize.
8. Calibrate the new sensor as described in the calibration section of this
manual.
Replacing the Sensor Cover and Charcoal Filter
WARNING: Replace the sensor cover and charcoal filter in a non-
hazardous environment.
When replacing the sensor filters, it is recommended that you replace all
filters at the same time.The HS-01 and OX-01 only have the sensor cover.
The CO-01 has the sensor cover and the charcoal filter.
1. Verify that the 01 Series is off.
2. With a small Phillips screwdriver, carefully unscrew the single screw
that holds the membrane retainer in place.
Allign slots in CO & H2S
sensors with tabs in case.
Note: Oxygen sensor is not keyed.
Unit shown without Sensor Retainer
Tab
Tab
Figure 8: Replacing the Sensor
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