RKI Instruments GX-2009 - Manual (Page 28)

28 • Write Commands
window.
5. Click OK. The program will return to the Main Window.
Calibration
Use Calibration to calibrate an instrument by adjusting the
instrument’s zero (fresh air) and span settings. Performing a
span adjustment requires the use of a 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 “Spare Parts List” on page 53 for
available calibration kits and calibration kit spare parts.
The area where you perform the calibration must be a fresh air
environment, an environment of normal oxygen content (20.9%)
that is free of toxic and combustible gases. Typical desktop
computer locations such as an office or laboratory are fresh air
environments, but if you are in the field using a laptop to
calibrate an instrument, be sure to confirm that the area is a
fresh air environment.
Figure 22: Upload Complete Window