
GX-2003 Operator’s Manual
Calibrating the GX-2003 • 89
The GX-2003’s calibration menu includes two methods of calibration:
auto calibration and single calibration.
• Auto Calibration: This method allows you to calibrate the
CH4(%LEL sensor only), OXY, H2S, and CO sensors
simultaneously. It is designed for use with the RKI 4-gas calibration
cylinder and is the quickest and easiest method to calibrate the GX-
2003.
• Single Calibration: This method allows you to calibrate one sensor
at a time. Use this method if you are only calibrating one or two
sensors, if you are calibrating the %volume combustible sensor, or
if you are not using the RKI 4-gas calibration cylinder.
Calibrating with the Auto Calibration Method
This section describes calibration using the auto calibration method.
To calibrate using the single calibration method, see “Calibrating with
the Single Calibration Method” below.
1. With the cursor next to the AUTO CALIBRATION menu item,
press and release the POWER ENTER button to display the
calibration values screen.
The gas concentrations displayed in the calibration values screen
must match the gas concentrations listed on the 4-gas calibration
cylinder. If all concentrations match, go to step 6. If one or more
concentrations do not match, continue with step 2.
2. To adjust the values on the screen, hold down the (SHIFT)
▼
button, then press the DISPLAY(ADJ) button and release both. The
CH4 calibration value begins to flash.
3. If necessary, use the
▲
AIR and (SHIFT)
▼
buttons to set the correct
combustible gas value.
4. Press and release the POWER ENTER button to enter the new
setting. The OXY calibration value begins to flash.
5. Repeat steps 3 and 4 to set the correct values for the remaining
channels. After the last channel is set, you return to the calibration
values screen and the values are no longer flashing.
C CH4 50%LEL
A OXY 12.0VOL%
L H2S 25.0ppm
. CO 50ppm
21:09