RKI Instruments SM-2003U - Manual (Page 17)

Hardware Setup • 17
Connecting an Exhaust Tube
The top exhaust fitting port is used to route exhaust away from the
calibration station. Install the 5/16” ID flexible tube that is included with
the calibration station on the top exhaust fitting port and route the tube to
an area where the calibration gas can be safely exhausted.
CAUTION: The maximum recommended length for the
exhaust tube is 10 feet. Do not use more than 10
feet of tubing or tubing with an ID of less than 5/16”
for the exhaust tube or the bump test and
calibration accuracy will be adversely affected. The
tube that is shipped with the Docking station has an
ID of 5/16” and is 10 feet long.
Connecting Calibration Gas
The CAL. GAS fitting on the back of the calibration station is designed to
be used with a calibration gas cylinder that is fitted with a demand flow
regulator. The AIR fitting may be used with a demand flow regulator and
a cylinder of zero emissions air, but this is not normally necessary since
the calibration station will generally be in a fresh air area.
The type of calibration gas cylinder used depends on the gas sensors
installed in the GX-2001 or GX-2003 being used with the calibration
station. Typically a 4-gas mix will be used if the instrument being used
with the calibration station is a 4-gas unit. If a GX-2003 that is a 5-sensor
unit is being used, a 100% volume methane cylinder will also be needed.
Use Table 3 below as a guide in determining which and how many
calibration gas cylinders are appropriate for your system.
Table 3: Recommended Gas Cylinders
Typical Instrument Types
Recommended Calibration Gas
Cylinder(s)
GX-2001
LEL/Oxy/H2S/CO 4-gas mix with CH4/Oxy/H2S/CO
GX-2001
LEL/Oxy/CO 3-gas mix with CH4/Oxy/CO