24 • Operation
GX-2009 Operator’s Manual
2. Press and release the POWER MODE button to enter Display Mode. The backlight will
turn on and the PEAK Screen will appear.
The peak readings since the GX-2009 was turned on are displayed for combustible gas,
CO, and H
2
S. The minimum reading is displayed for oxygen.
3. If you do not want to clear the peak readings, continue to the next step.
If you want to clear the peak readings, press and hold the AIR button. After a couple of
seconds, the LCD will prompt you to hold the AIR button with the following screen.
Hold the AIR button until the following screen appears, then release it.
The peak readings will be cleared and the unit will return to the PEAK Screen.
4. Press and release the POWER MODE button again to proceed to the STEL Screen. The
STEL values for CO and H
2
S are displayed.
5. Press and release the POWER MODE button again to proceed to the TWA Screen. The
TWA values for CO and H
2
S are displayed.
6. Press and release the POWER MODE button again to proceed to the Full Scale Screen.
The detection range full scale value for each channel is displayed.
7. Press and release the POWER MODE button again to return to Measuring Mode.
NOTE:
If you do not press a button for 20 seconds while in Display Mode, the GX-2009
will return to Measuring Mode automatically and the backlight will turn off 30
seconds since the last button was pressed.
0 20.9
PEAK
CO ppm H2S ppm
CH4 %LEL OXY vol%
0 0.0
C L E A r
HOLD AIR
C L E A r
RELEASE
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