Protégé Portable Gas Monitor
Instruction Manual
32 of 61
P/N 087-0038 Rev. J 02/10
Table 4-1. When to Perform Calibration or Bump Testing
Calibration or
Test
Perform When
Zero Calibration
• Daily
• When baseline readings are incorrect or suspect
• Prior to a Span Calibration
Span Calibration
• CAL EXPIRED is displayed
• After installing new sensors
• When a Bump Test fails
Bump Test
• Daily
• When a sensor is exposed to a high
concentration of gas
• When submerged in water
• When exposed to mechanical shock, such as
being dropped
4.3.1. Zero Calibration
1) Verify ambient air is free of toxic or combustible gases. If air is not free or can not be verified
free, obtain a Zero Air gas cylinder.
2) Power on the Protégé.
3) Press and hold the right operational button until PLEASE WAIT is displayed.
WARNING
TO PREVENT AN ERRONEOUS ZERO CALIBRATION FROM OCCURRING, THE PROTÉGÉ WILL DISPLAY IS AIR
CLEAR? IF THE MONITOR IS INDICATING A GAS READING THAT IS 50% OR HIGHER OF AN ALARM SET POINT FOR
ANY OF THE GASES IT IS EQUIPPED TO DETECT. THE USER HAS 20 SECONDS TO ACKNOWLEDGE THE ALERT. IF
THE ALERT IS NOT ACKNOWLEDGED WITHIN 20 SECONDS, THE PROTÉGÉ WILL POWER OFF. DO NOT CONTINUE
WITH ZERO CALIBRATION UNTIL AIR HAS BEEN VERIFIED FREE OF TOXIC AND COMBUSTIBLE GASES. FAILURE
TO PROPERLY PERFORM A ZERO CALIBRATION MAY RESULT IN INJURY OR DEATH.
NOTE
B
ASELINE READINGS FOR A ZERO CALIBRATION ARE 0 FOR H
2
S, CO, AND LEL, AND 20.9% FOR O2.
4) If display indicates IS AIR CLEAR?, and atmosphere has been verified free, press the right
button to start the Zero calibration.
5) Wait for Protégé to complete Zero calibration. If passed, the LCD will display APPLY GAS. If
failed, the LCD will display FAILED and the appropriate failing sensor(s).
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