3M™ PROTÉGÉ SG
PORTABLE, REUSABLE, SINGLE-GAS MONITOR
MAINTENANCE
087-0065, Rev D/February 2019
6-2
6.1.1. ZERO CALIBRATION
1. Verify ambient air is free of toxic or combustible gases. If air is not free or cannot be verified free,
obtain a Zero Air gas cylinder.
2. Power on the device.
3. Press and hold the right button, a screen appears stating release IN 3 SECONDS, continue to
hold it until the ZERO screen display (see
).
Figure 6-1: ZERO Calibration Screen
4. Press the left button, the device displays AIR CLN (Is air clean?). If yes, press the left button to
acknowledge the zero calibration and it will countdown.
5. If the air is not clean, press the right button to cancel the zero calibration.
6. After a successful calibration the LCD reads ZERO PASS, then press right button or wait for 60
seconds to go to span calibration. 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.
Bump Test
• Daily
• When a sensor is exposed to a high concentra-
tion of gas
• When submerged in water
• When exposed to mechanical shock, such as
being dropped
WARNING: ONLY PERFORM O
2
CALIBRATION IN NORMAL AIR (20.9% OXYGEN)
THAT IS FREE OF HAZARDOUS GASES. DURING THE ZERO
CALIBRATION, ANY INSTALLED OXYGEN SENSOR WILL BE SPANNED
TO 20.9% O2.
WARNING: DO NOT PERFORM A ZERO CALIBRATION ANYWHERE FROM 5
MINUTES TO 1/2 HOUR AFTER THE START UP TO ENSURE ACCURACY.
FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN
SERIOUS INJURY OR DEATH.
NOTE: You have 60 seconds to acknowledge the alert. If you do not acknowledge the alert
within 60 seconds, the device goes to the span calibration.
Table 6-1: Recommended Calibration and Test Matrix
Procedure
Frequency
Details
CAL
ZERO
O
2
