RKI Instruments GX-2009 Manual - Manual (Page 37)

GX-2009 Operator’s Manual Calibration Mode • 32
calibration kit. The procedure below describes a span adjustment of all four
channels using a calibration kit that includes a 4-gas calibration cylinder, a
0.5 LPM (liters per minute) regulator, a calibration adapter plate, and non-
absorbent sample tubing. The standard 4-gas cylinder consists of 50% LEL
methane, 12% oxygen, 25 ppm H2S, 50 ppm CO, and a balance of
nitrogen. If the H2S channel on your GX-2009 is active, then use a 4-gas
cylinder. If the H2S channel on your GX-2009 is not active, you may use a
3-gas cylinder to adjust the span. The standard 3-gas cylinder consists of
50% LEL methane, 12% oxygen, 50 ppm CO, and a balance of nitrogen.
See “Parts List” on page 66 for available calibration kits and calibration kit
spare parts.
NOTE: If the combustible gas channel is calibrated to a gas other than
methane, such as isobutane, use an appropriate multigas cylinder
or use single calibration to calibrate the combustible channel.
WARNING: Calibrate the GX-2009 in a non-hazardous environment.
1. Before performing a span adjustment, perform a fresh air adjustment as
described in “Performing a Fresh Air Adjustment” on page 30.
2. At the AUTO CAL screen, press and release the POWER MODE
button. A screen appears that displays the calibration gas
concentrations that the GX-2009 expects you to use.
If the displayed concentrations match the calibration cylinder
concentrations, continue with Step 3.
If any of the displayed concentrations do not match the calibration
cylinder concentrations or if you want to turn off the AUTO CAL function
for a channel or channels, do the following:
• Press and hold the AIR button, then press and momentarily hold the
POWER MODE button.
• Release both buttons as soon as you hear the buzzer sound a beep.
The following screen will display.
• You can scroll through all the channels by pressing and releasing
50 12.0
AUTO CAL
CO ppm H2S ppm
CH4 %LEL OXY vol%
50 25.0
- - -
AUTO CAL
CH4 %LEL