77 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
6. The CO
2
gas reading flashes and the bottom of the screen indicates “CO2 ZERO CAL” and
“APPLY GAS”.
NOTE: To back out of the gas application screen without performing the bump test,
press and release AIR and POWER MODE together.
7. Turn the regulator knob counterclockwise to open the regulator.
8. Allow the gas to flow for 1 minute.
9. Press and release POWER MODE.
10. Turn the regulator knob clockwise to close the regulator.
11. If the zero adjustment passed the screen says “PASS” and the instrument returns to the Gas
Cal menu.
12. If the zero adjustment failed:
a. “FAIL” replaces the gas reading.
b. The LEDs flash and the buzzer sounds a double pulsing tone.
c. Press and release POWER MODE to clear the failure. The instrument returns to the GAS
CAL menu.
d. See “Troubleshooting” on page 118.
13. Unscrew the regulator from the calibration cylinder.
14. Remove the calibration cup from the GX-3R Pro.
15. Store the calibration kit in a safe and convenient place.
16. Use AIR to place the cursor next to ESCAPE.
17. Press and release POWER MODE. The instrument returns to User Mode.
MAINTE 7:49
0.04
CO2 vol%
CO2 ZERO CAL APPLY GAS
MAINTE 7:49
FAIL
CO2 vol%
CO2 ZERO CAL
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