64171, Rev. 10/May 2019
3M™ GMI™ PS200 PORTABLE GAS MONITOR
OPERATION
3-7
Figure 3-13: 4-Gas Normal Operating Display
3.4. Switch the Display Backlight On/Off
The display backlight can be manually switched ON when working in poor lighting conditions.
Press the R button once to switch ON. After 20 seconds it will automatically switch OFF.
3.5. View MAX/MIN/STEL/LTEL
The monitor records the maximum (MAX) and minimum (MIN) gas values since switch-on. It also
evaluates the short-term exposure (STEL) and long-term exposure (LTEL) for CO and H
2
S.
To view MAX/MIN/STEL/LTEL:
1. From the normal operating display, press the R button once to switch the monitor backlight ON.
2. While the backlight is still ON, press the R button once to view the MAX gas values.
3. Press the R button a 2
nd
time to view the MIN gas values.
4. Press the R button a 3
rd
time to display the STEL values.
5. Press the R button a 4
th
time to display the LTEL values.
illustrates the MAX, MIN, STEL, and LTEL values on a
4-gas monitor.
Figure 3-14: MAX/MIN/STEL/LTEL Gas Values
NOTE: The MIN is only displayed if an Oxygen sensor is fitted in the monitor.
