RKI Instruments GX-2012 Manual - Manual (Page 116)

108 • Using Maintenance Mode GX-2012 Operator’s Manual
19. Press and release the POWER ENTER button to set the calibration to the
programmed values.
If all channels passed calibration, PASS displays along the bottom of the
screen, then the calibration menu displays.
If any of the sensors cannot calibrate to the proper value, FAIL displays
along the bottom of the screen and the GX-2012 lists the sensor(s) that
failed to calibrate. In the example below, the OXY and H
2
S channels
failed calibration. The other sensors calibrated normally.
The buzzer and alarm lights activate. Press and release the RESET
SILENCE button after the buzzer and lights stop to reset the alarm and
return to the calibration menu. Attempt to calibrate again. If the failure
continues, investigate the cause. See “Troubleshooting” on page 143.
20. Disconnect the tubing from the probe.
21. Unscrew the demand flow regulator from the calibration cylinder.
22. If you have a 5 sensor unit and wish to calibrate the %volume
combustible gas sensor, go back to step 1 and repeat the process,
selecting the %volume calibration gas value screen in step 16 and using a
%volume methane calibration cylinder.
If you are finished calibrating, use the (SHIFT)T button to navigate to
the NORMAL menu item, then press and release the POWER ENTER
button to return to Measuring Mode.
Calibrating Using Single Calibration
If CL EXPRD is set to NOT USE and calibration becomes due, then the unit
must be calibrated using this menu item and/or the previous menu item,
AUTO CAL because it will not be possible to enter normal operation. See
“Calibration/Bump Test Supplies and Equipment” on page 57 for the items
you will need to perform a calibration.
The procedure below describes a span adjustment of one channel using a
calibration kit that includes a 4-gas calibration cylinder, a 0.5 LPM (liters per
minute) regulator, and non-absorbent sample tubing. The standard 4-gas
%
ppm
MAINTENANCE
O
2
FAIL
H
2
S