64171, Rev. 10/May 2019
3M™ GMI™ PS200 PORTABLE GAS MONITOR
CALIBRATION
9-2
9.2. Quick Calibration
This feature, if enabled, allows calibration without using the monitor’s set-up menu and passcodes.
Quick Calibration uses predefined calibration gas cylinder values saved in the monitor. The default
values are:
• 50% LEL
• 18% O
2
• 100PPM CO
• 25PPM H
2
S.
The user must ensure the correct calibration gas and regulator should be used.
1. To access the quick calibration feature, press and hold the L button while the monitor is switched
ON. The monitor will first enter self-test.
2. Continue holding the button until the self test finishes and the LCD displays ZERO CALIBRA-
TION, as shown in
.
Figure 9-2: ZERO CALIBRATION Screen
3. Next, in a clean air environment, press and hold the R button to zero calibrate the monitor ranges.
Once the zero calibration finishes, the monitor displays SPAN CALIBRATION, as shown in
Figure 9-3: SPAN CALIBRATION Screen
4. Apply the gas to the monitor via a direct/fixed flow regulator (with a flow set at 0.5 l/min).
NOTE: These pre-defined cylinder values can only be adjusted via the monitor set-up
menu.
