Filter
Top Products
Instruction Manual
IM-106-340AC-1, Rev. 1.0
April 2005
SPS 4001B
2-2
GAS CONNECTIONS
Use the following procedures to connect the reference air and the calibration
gases.
Reference Air (Figure 2-1)
The Oxymitter 4000 requires a source of reference air that is constantly
20.95% O
2
. Clean and dry instrument air provides the most stable source of
reference air. If instrument air is unavailable, the reference air port of the
probe can be left open, permitting ambient air to passively diffuse into the
probe.
1. Connect the instrument air supply to the INST AIR IN port of the
manifold.
2. The pressure regulator is factory set at 20 psi (138 kPa). If necessary,
readjust by turning the knob on the top of the regulator until the desired
pressure is obtained.
3. Next, connect the reference air from the REF GAS OUT port of the
manifold to the REF GAS port on the Oxymitter 4000.
Calibration Gas (Figure 2-1)
1. Connect O
2
calibration gas 1 (high calibration gas) to the HI GAS IN
port on the manifold. Ensure the calibration gas pressure is set at 20 psi
(138 kPa).
2. Connect O
2
calibration gas 2 (low calibration gas) to the LOW GAS IN
port on the manifold. Ensure the calibration gas pressure is set at 20 psi
(138 kPa).
3. Connect the calibration gas from the CAL GAS OUT manifold fitting to
the check valve connected to the CAL GAS port on the Oxymitter 4000.
Instrument air is not recommended for the high calibration gas. Do not use 100% nitrogen
as a low gas (zero gas). It is suggested that the low (zero) gas be between 0.4% and 2.0%
O
2
. Do not use gases with hydrocarbon concentrations of more than 40 parts per million.
Failure to use proper gases will result in erroneous readings.