3M PROTEGE PLUS - 7. MAINTENANCE; 7.1. Testing the Monitor; Calibration Due Warning; Recommended Calibration and Test Matrix

3M™ PROTÉGÉ PLUS
PORTABLE MULTI-GAS MONITOR
MAINTENANCE
8006569, Rev. C/June 2019 7-1
7. MAINTENANCE
7.1. Testing the Monitor
3M recognizes the potential of the device when operated and maintained correctly. As such, verify-
ing proper operation of the device in the form of Calibration and daily Bump Testing is essential to
ensure the monitor performs as intended in a potentially hazardous environment.
The frequency at which Calibration and Bump Testing occur is best determined based on local regu-
latory standards, company policies, and industry best practices. 3M is not responsible for setting pol-
icies or practices.
• Zero Calibration — establishes baseline readings of atmospheres that are known to be free of
toxic or combustible gases.
• Span Calibration — ensures the monitor detects target gases within specified operating parame-
ters. Adjusts the monitor’s response to match a known concentration of gas. Sensors lose sensi-
tivity through normal degradation, exposure to high gas concentrations, 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.
Table 7-1: lists 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.
Table 7-1: Recommended Calibration and Test Matrix
Procedure Frequency Details
Zero Calibration
• When baseline readings are incorrect or suspect
• Prior to a Span Calibration
Refer to Section 7.1.1.
ZERO CALIBRATION
Span Calibration
• CAL EXPIRED is displayed
• After installing new sensors
• When a Bump Test fails
Refer to Section 7.1.2.
SPAN CALIBRATION
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
Refer to Section 7.1.3.
BUMP TEST
CAUTION: End users of instruments containing the 4COSH (Dual Tox CO/H
2
S) sensor
must recalibrate the instrument at an increased frequency greater than 6-12
months based on their own risk assessment for the application and
environment. Where an end user risk analysis is not available, then a 3-month
calibration period is required.