Warning

To avoid personal injury and/or property damage, only use sensors that are specifically designed for the detector.

Note

Detectors that are configured for 1, 2, or 3 gases may contain a dummy sensor in one of the four sensor locations.

To replace a sensor or sensor filter, refer to the illustration Replacing the Sensors and the following steps #1-8.

1. Press and hold to deactivate the detector. Press the release latch, and remove the battery pack.
2. Remove the six machine screws from the rear shell.
3. Remove the front shell.
4. Remove the spent sensor(s). Ensure no damage occurs to the LCD.
5. Insert the new sensor(s).
6. Reassemble the detector. Press the f the front and rear shells have a tight, uniform 1/16 in.(1.5 mm) seal on all sides of the detector.
7. Replace the six machine screws using 3-4 in. lbs torque. Do not overtighten the screws. Replace the battery pack.
8. New sensors must be calibrated prior to use. Calibrate the new sensor(s) immediately. Refer to Calibration.

Replacing the Sensor Filter

To replace the filter, refer to the illustration Replacing the Sensors and the following steps #1-6.

1. Press and hold to deactivate the detector. Press the release latch, and remove the battery pack.
2. Remove the six machine screws from the rear shell.
3. Remove the front shell. Remove the sensor filter.
4. Refer to the following illustration before inserting the new filter. Ensure the filter is laying flat and that the holes are correctly aligned over the filter posts.

5. Replace the front shell. Press the front and rear shells together firmly to ensure a proper seal. Ensure the front and rear shells have a tight, uniform 1/16 in. (1 mm) seal on all sides of the detector.
6. Replace the six machine screws using 3-4 in. lbs torque. Do not overtighten the screws. Replace the battery pack.