RKI Instruments SDM-2012 Standalone Configuration - Manual (Page 38)

33 • Connecting Calibration Gas
To connect calibration gas to the SDM-2012, do the following:
1. If the area around the docking station is not considered a fresh air area (an
area free of combustible and toxic gases and of normal oxygen content,
20.9%) install a tube not longer than 10 feet on the filter attached to the AIR
fitting on the back of the docking station and route it to a fresh air area or
connect a cylinder of zero air with a demand flow regulator to the AIR fitting.
NOTE: If you will be using a zero air cylinder with a Gas Tracer in the docking
station, you must connect the zero air cylinder to the AIR fitting using a
6 inch humidifier.
2. Install the demand flow regulator on the calibration gas cylinder(s).
3. Connect the demand flow regulator to the GAS 1 or GAS 2 inlet fitting using
the 3 foot length of 3/16 inch ID sample tubing provided with the docking
station.
For a 3- or 4-gas mix, connect the regulator to the GAS 1 inlet.
For a special calibration cylinder (ppm or %volume), connect the regulator to
the GAS 2 inlet keeping in mind that you will need to use a humidifier if bump
testing or calibrating a Gas Tracer.
ppm CH
4
/LEL CH
4
/Oxy/CO
(Gas Tracer)
• 3-gas mix with CH
4
/Oxy/CO
• 1000 ppm CH
4
ppm CH
4
/LEL CH
4
/%vol CH
4
/Oxy/CO
(Gas Tracer)
• 3-gas mix with CH
4
/Oxy/CO
• 1000 ppm CH
4
• 100% volume CH
4
Table 4: Recommended Gas Cylinders
Typical Instrument Types
Recommended Calibration Gas
Cylinder(s)