Reference Manual
00809-0100-4882, Rev AB
May 2019
Rosemount 5081FG
3-3
ESTABLISHING
PROPER CALIBRATION
GAS FLOW RATE
The calibration gas flow must be enough to ensure that no combustion flue
gases mix with the calibration check gases and only clean, good calibration
check gas surrounds the cell without expending excess gas (Figure 3-3).
Monitor the O
2
concentration using an IRC or a field communicator. Set the
calibration check gas flow rate as follows:
NOTE
Only set the calibration check gas flow rate at startup. It is not necessary to
perform this procedure for each calibration check.
1. Adjust the calibration check gas flow to 5 scfh (2,5 /min.) to ensure the
cell is surrounded by calibration check gas. Due to the cooling effect of
the gas, the cell temperature will decrease slightly, causing the O
2
concentration to drop. Once the electronics compensates for this effect,
the O
2
concentration will stabilize.
2. Next, slowly reduce the calibration check gas flow until the O
2
concentration changes, which indicates that the calibration check and
flue gases are mixing. Increase the flow rate until this effect is
eliminated.
Figure 3-3. Proper Calibration Check Gas Flow Rate
Summary of Contents for Rosemount 5081FG
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