47 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
Peak Screen (PEAK)
The peak screen displays the highest (lowest for oxygen) concentrations detected since the GX-
3R Pro was turned on. Peak readings are stored in the GX-3R Pro’s memory until a higher level is
detected (lower for oxygen), the peak reading is cleared, or the GX-3R Pro is turned off.
The lunch break feature enables the GX-3R Pro to save peak readings when it is turned off so it
can continue with the same peaks when it is turned on again. See page 106 for instructions to turn
the lunch break feature on (default is off).
To clear the peak readings, do the following:
NOTE: If Password Protection is set to On using the SDM-3R PC program, the peak reading
cannot be cleared.
1. While in Display Mode, press and release POWER MODE until PEAK appears.
2. Press and hold AIR until the screen prompts you to release it.
3. The peak readings are reset and the unit returns to the Peak Screen.
If you do not want to clear the peak readings, release AIR before the above screen
sequence occurs. The unit returns to the Peak Screen.
STEL Screen (STEL)
The STEL Screen displays the short term exposure limit (STEL) readings for H
2
S, CO, CO
2
, and
super toxic only. The STEL reading is the average reading over the last 15 minutes.
PEAK
7:49
18.7 5.50
O2 % CO2 vol%
12 7 23.0
CH4 %LEL CO ppm H2S ppm
7:49
HOLD AIR KEY
PEAK CLEAR
7:49
RELEASE
PEAK CLEAR
STEL
7:49
1.50
CO2 vol%
2 3.0
CO ppm H2S ppm
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