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64171, Rev. 10/May 2019

3M™ GMI™ PS200 PORTABLE GAS MONITOR

ALARMS

4-2

Figure 4-2: LEL HIHI Alarm

4.2. Acknowledge Gas Alarms

After the gas readings have returned to a safe level, press and hold the R button to clear all alarms.

4.3. Mute Alarms

If configured, muting the alarm will silence the audible alarm for 60 seconds, as follows:

• Non-latching alarm: silences the audible alarm for 60 seconds. If the gas reading during that time

falls below the alarm set point, the visual alarm clears automatically.

• Latching alarm: silences the audible alarm for a period of 60 seconds. If the gas reading during

that time falls below the alarm set point, the user must acknowledge the visual alarm to clear it.

4.4. High Flammable Gas Over-range Alarm

An over-range alarm protects the user and the LEL sensor during exposures to high concentrations

of flammable gas. If the LEL reading exceeds 100% LEL (see

Figure 4-3: Over Range Alarm):

• monitor vibrates;

• displayed value changes to 4 rising arrows;

• display turns red;

• audible alarm tone changes;

• LED’s flash quickly;

• DANGER OVERRANGE flashes on the display.

WARNING: HIGH OFF-SCALE READINGS MAY INDICATE AN EXPLOSIVE

CONCENTRATION.

3M GMI PS200 Series User Manual

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