RKI Instruments SDM-E2 - Manual (Page 30)

25 • Connecting Calibration Gas
Use Table 4 below as a guide in determining which calibration gas cylinder is
appropriate for your system. See “Spare Parts List” on page 80 for a list of available
cylinder part numbers.
To connect calibration gas to the SDM-E2, 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.
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 (PID, TC, ESM-01, etc.), connect the
regulator to the GAS 2 inlet.
Table 4: Recommended Gas Cylinders for Typical Instrument Types
Typical Instrument Types
Recommended Calibration Gas
Cylinder
3-gas (LEL/Oxy/CO) 3-gas mix with LEL/Oxy/CO
Standard 4-gas (LEL/Oxy/H2S/CO) 4-gas mix with LEL/Oxy/H2S/CO
Standard 4-gas + low range PID 4-gas mix and IBL
Standard 4-gas + high range PID 5-gas mix with LEL/Oxy/CO/H2S/IBL
Standard 4-gas + NH3 4-gas mix and NH3
Standard 4-gas + low range PID + NH3 4-gas mix and IBL and NH3
Standard 4-gas + high range PID + NH3 5-gas mix with LEL/Oxy/CO/H2S/IBL and
NH3
Standard 4-gas + SO2 5-gas mix with LEL/Oxy/CO/H2S/SO2