3M™ PROTÉGÉ PLUS
PORTABLE MULTI-GAS MONITOR
MAINTENANCE
8006569, Rev. C/June 2019 7-7
6. Verify the device responds to target gas and activates 1 green LED flash every 5 seconds, 1
sounding beep every 5 seconds, and 1 vibration every 5 seconds. Press the right button or wait
60 seconds to go to Exit screen.
7. After an unsuccessful calibration, the monitor will beep and flash and continues to display FAIL.
Verify the device activates 1 red LED flash every 2 seconds, 1 sounding beep every 2 seconds and
1 vibration every 2 seconds.
8. Turn off the gas cylinder and remove Calibration Adapter.
7.2. Maintenance
7.2.1. REPLACING SENSORS
Replace the sensors as follows:
1. Set or verify the device is turned off.
2. Unscrew and remove the four (4) M2.5 × 20 screws from the back of the device using a Philips
screwdriver (refer to Figure 7-6:).
Figure 7-6: Sensor Access
3. Lift and firmly pull the sensor cover apart. Do not pull apart at an angle or by twisting.
4. Unplug the sensor and replace with the new sensor.
WARNING: DO NOT REPLACE SENSORS WHILE IN A HAZARDOUS LOCATION.
FAILURE TO FOLLOW THIS WARNING COULD LEAD TO SERIOUS
INJURY OR DEATH.
NOTE: The torque of the screwdriver should be 3 to 4 inch-pounds to loosen or tighten the
screws.
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