Chapter 3: Hardware Setup • 23
Examples for One SDM-3R
Examples for Multiple SDM-3Rs Connected Together
If you are connecting multiple SDM-3Rs together, it is possible to test GX-3R (Pro)s with different gas
combinations at the same time.
If testing different GX-3R (Pro) combinations at once requires more than 3 cylinders, you can assign
channels to
CHG 3
in the SDM-3R’s Configuration Menu and the SDM will prompt you to change
cylinders during a bump test or calibration.
Connecting Calibration Cylinders
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 left side 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
Instrument Types
Recommended Calibration Gas Cylinder and
Gas Inlet Selection
3-gas (LEL/Oxy/CO)
GAS 1
: 3-gas mix with LEL/Oxy/CO
3-gas (LEL/Oxy/CO) + CO2
GAS 1
: 3-gas mix with LEL/Oxy/CO
GAS 2
: N2
GAS 3
: CO2
3-gas (LEL/Oxy/CO) + SO2
GAS 1
: 3-gas mix with LEL/Oxy/CO
GAS 2
: SO2
4-gas (LEL/Oxy/CO/H2S)
GAS 1
: 4-gas mix with LEL/Oxy/CO/H2S
4-gas (LEL/Oxy/CO/H2S) + IR CO2
GAS 1
: 4-gas mix with LEL/Oxy/CO/H2S
GAS 2
: N2
GAS 3
: CO2
4-gas (LEL/Oxy/CO/H2S) + SO2
GAS 1
: 5-gas mix with LEL/Oxy/CO/H2S/SO2
Instrument Types
Recommended Calibration Gas Cylinder and
Gas Inlet Selection
All Instruments
: 4-gas + IR CO2
GAS 1
: 4-gas mix with LEL/Oxy/CO/H2S
GAS 2
: N2
GAS 3
: CO2
All Instruments
: 4-gas + SO2
GAS 1
: 5-gas mix with LEL/Oxy/CO/H2S/SO2
Instrument 1
: 3-gas + SO2
Instrument 2
: 3-gas + IR CO2
GAS 1
: 3-gas mix with LEL/O2/CO
GAS 2
: SO2
GAS 3
: N2
CHG 3
: CO2
Instrument 1
: 4-gas + SO2
Instrument 2
: 4-gas + IR CO2
GAS 1
: 5-gas mix with LEL/Oxy/CO/H2S/SO2
GAS 2
: N2
GAS 3
: CO2