58 • Calibration Mode GX-2012 Operator’s Manual
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channel(s).
Preparing for Calibration or Bump Testing
Whether you will calibrate the GX-2012 using auto calibration, single
calibration, or perform a bump test, you will need to set the fresh air readings
first.
1. Find a fresh-air environment. This is an environment free of toxic or
combustible gases and of normal oxygen content (20.9%).
2. Turn on the unit as described in “Turning On the GX-2012, Normal Mode
Only” on page 19 or in “Turning On the GX-2012 in Normal Mode With
All Modes Active” on page 25. Use the sample hose and probe.
3. With the unit on, perform a fresh air adjustment by pressing and holding
the AIRS button. The display prompts you to hold the AIRS button.
4. Continue to hold the AIRS button until the display prompts you to
release it. The GX-2012 will set the fresh air reading for all channels as it
counts down from 8. If the combustible channel is set as %LEL only or
vol% only, there is no countdown period. The fresh air reading is set
immediately.
5. Install the demand flow regulator onto the calibration cylinder.
6. Connect the sample tubing to the demand flow regulator.
Calibrating the GX-2012
From Measuring Mode, enter Calibration Mode by pressing and holding the
(SHIFT)T button, then pressing the DISPLAY(ADJ) button and releasing
both. If the unit prompts you for the password, enter it by using the AIRS
and (SHIFT)T buttons to select each password number and then pressing
and releasing POWER ENTER to confirm it and move on to the next number.
To go back a number, press and release the RESET SILENCE button. The
factory set password is the same as the factory set password for Maintenance
Mode: 2102. You can change the password by entering the PASSWORD
menu item in Maintenance Mode. See “Turning the Password Function On or
Off” on page 140. If you enter an incorrect password, an error screen will
display.
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