RKI Instruments GX-2012 - Page 177

GX-2012 Operator’s Manual Calibrating the GX-2012 • 169
concentration of 10-50% of the full scale value of the target gas. For
example, if you are calibrating the combustible gas channel, your
calibration cylinder should have a combustible gas concentration
between 10% LEL and 50% LEL. For the oxygen channel, RKI
Instruments, Inc. recommends using 100% nitrogen to perform the
adjustment but any concentration between 0% oxygen (100%
nitrogen) and 17% oxygen can be used to make the adjustment.
NOTE: If your combustible gas channel is calibrated to a gas other
than methane, use an appropriate gas cylinder to perform the
calibration.
CAUTION: The single calibration method does not have a “FAIL”
notification. If a sensor cannot be set to agree with the
calibration source, see “Troubleshooting” on page 143.
1. While in the calibration menu, use the AIRS or (SHIFT)T button to the
ONE CAL menu option.
2. Press and release the POWER ENTER button to display the single
calibration menu. The %LEL sensor will be displayed first.
MAINTENANCE
ONE CAL
- - -
%LEL
MAINTENANCE
CH4
ONE CAL