Refer to the following sections and select the option that applies to your
transmitter configuration.
2.4.1 Reference air set option (only)
When no options or only the reference air set option is equipped, use the
following procedure to install the pneumatic system components.
Procedure
1. Refer to Figure 2-11. Connect the reference air set (regulator/filter and
pressure gauge) to the instrument air inlet on the electronics housing and
to the inlet side of the dilution air flow meter.
2. Connect the dilution air flow meter output to the dilution air inlet fitting on
the sensor housing.
3. Install an air line between the instrument air outlet fitting on the electronics
housing and the tee fitting on the sensor housing.
CAUTION
Failure to use proper gases will result in erroneous readings.
Do not use 100 percent nitrogen as an O
2
low gas.
We recommend using O
2
low gas between 0.4 percent and 2.0 percent
O
2
.
Do not use gases with hydrocarbon concentrations of more than 40
parts per million.
4. Use one CO gas and two O
2
gases to calibrate the transmitter.
• CO: 1000 ppm or up to 4 percent, balance air
• O
2
low gas: 0.4 percent , balance N
2
• O
2
high gas: 8 percent, balance N
2
5. Connect the output of the test gas sources to the inlet port of the CAL GAS
flow meter. Install an air line between the flow meter outlet port and the
CAL GAS inlet fitting on the sensor housing.
Install Manual
December 2022 00809-0500-4880
44 Emerson.com/Rosemount
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