RKI Instruments GX-2001 Data Logging with Calibration Station - Manual (Page 44)

44 • Calibrating the Model GX-2001 with the Calibration Station
Demand Flow Regulator. This item comes with the GX-2001
Calibration Station. It screws into the top of the calibration gas
cylinder and controls the flow of gas from the cylinder to the GX-
2001 Calibration Station.
Gas Cylinder. A four-gas, 58 liter cylinder comes as standard
equipment with the GX-2001 Calibration Station. It contains 50%
LEL methane (CH
4)
, 12% oxygen (O
2
), 50 ppm carbon
monoxide (CO), and 25 ppm hydrogen sulfide (H
2
S). The
balance gas is nitrogen (N
2
).
Polyurethane Tubing. Three feet of 1/4-inch OD x 1/8-inch ID
polyurethane tubing comes as standard equipment to connect
the regulator to the “Span Gas In” fitting on the back of the GX-
2001 Calibration Station. The GX-2001 Calibration Station also
includes a short piece of 3/16-inch ID x 5/16-inch OD
polyurethane tubing connected to the regulator with an adaptor
to connect it to 1/4-inch tubing. Additional tubing for use with the
Fresh Air In and Exhaust fittings may be purchased separately.
Extension Cables. Two six-foot DB-9 female/female extension
cables are included with the GX-2001 Calibration Station.
Power Cord. A power cord connects the GX-2001 Calibration
Station to an electrical outlet.
Calibrating a Three-Gas Model GX-2001
If you have a three-gas Model GX-2001 unit that measures
methane, oxygen, and hydrogen sulfide, you will still need to use
the four-gas calibration cylinder described above.
If you have a three-gas Model GX-2001 unit that measures
methane, oxygen, and carbon monoxide, then you can use a
three-gas mix with methane, oxygen, and carbon monoxide to
calibrate. This cylinder is a 103 liter cylinder and it has the
following concentrations: 50% LEL CH4, 12.0% O2, and 50 ppm
CO. See the Parts List at the end of this manual for the three-
gas mix RKI part number.