RKI Instruments GX-2012 - Page 68

60 • Calibration Mode GX-2012 Operator’s Manual
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” on page 63. These instructions assume you are
using a 4-gas cylinder and a %volume methane cylinder.
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).
1. You may only calibrate either the standard 4 sensors or the % volume
combustible sensor at a time. Once you are finished, you are returned to
the initial AUTO CAL screen and must begin the auto calibration process
again.
2. Use the AIRS and (SHIFT)T buttons to display the AUTO CAL menu
item, press and release the POWER ENTER button to display the
calibration values screen. If you want to exit back to the main menu
without completing a calibration, press and release the DISPLAY (ADJ)
button.
3. Use the AIRS or (SHIFT)T button to alternate between the 4-gas and
the % volume combustible gas calibration values screens.
4. The gas concentrations displayed in the calibration values screens must
match the gas concentrations listed on the calibration cylinders. If all
concentrations match, go to step 12. If one or more concentrations do not
match, continue with step 5.
5. To adjust the values on the screens, hold down the (SHIFT)T button,
50
12.0
50
25.0
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
AUTO CAL
CO
H2S
100
vol%
MAINTENANCE
CH4
AUTO CAL