3M™ PROTÉGÉ SG
PORTABLE, REUSABLE, SINGLE-GAS MONITOR
MAINTENANCE
087-0065, Rev D/February 2019
6-1
6. MAINTENANCE
6.1. Testing the Monitor
3M recognizes the potential of the device when operated and maintained correctly. Therefore, the
operator must verify proper operation of the device in the form of Calibration and daily Bump Test-
ing to ensure the monitor performs as intended in a potentially hazardous environment.
Local regulatory standards, company policies, and industry best practices provide the best determi-
nation for the frequency at which Calibration and Bump Testing occur. 3M assumes no responsibility
for setting policies or practices.
• Zero Calibration — Establishes baseline readings of atmospheres that are known to be free of
toxic or combustible gases.
• Span Calibration — Ensures the device detects target gases within specified operating parame-
ters. Calibration is the adjustment of the monitor’s response to match a known concentration of
gas. Sensors can lose sensitivity through normal degradation, exposure to high gas concentra-
tions, or sensor poisoning. Accurate calibration can be achieved only if specific concentrations of
the correct gases are used.
• Bump Test — Verifies the Span Calibration by subjecting the device to a known concentration of
gas, and verifies that the display reads PASS.
Recommended Calibration and Test Matrix
details the recommended calibration and test
items for the device.
WARNING: OPERATING A DEVICE THAT HAS EXCEEDED ITS CALIBRATION DATE
CAN CAUSE FALSE READINGS OF DETECTED GASES. READINGS
OBTAINED WHILE MONITOR IS OUT OF CALIBRATION MAY BE INVALID
AND COULD LEAD TO DEATH OR INJURY.
WARNING: BUMP TEST AND CALIBRATION ARE NOT ACCURATE WHEN
PERFORMED IMMEDIATELY AFTER THE STARTUP.
Table 6-1: Recommended Calibration and Test Matrix
Procedure
Frequency
Details
Zero Calibration
• When baseline readings are incorrect or sus-
pect
• Prior to a Span Calibration
Span Calibration
• CAL EXPIRED is displayed
• After installing new sensors
• When a Bump Test fails
