
Calibrate a badly plugged diffuser
It may not be possible to immediately replace a plugged diffuser while the process is on-
line. You can calibrate the probe without pressurizing the cell by adjusting the calibration
gas flow rate downward before calibration.
For instance, say the process is at three percent, and the first calibration gas is eight
percent.
WARNING
Failure to install covers and ground leads could result in serious injury or death.
Install all protective equipment covers and safety ground leads after installation.
Procedure
1. Adjust the flow of cal gas downward until the reading begins to migrate from eight
percent to lower values, indicating that process gases are now mixing with the
calibration gases.
2. Adjust the flow rate back up until this mixing is just eliminated.
3. Calibrate at this flow rate.
4. Replace the diffuser at the first opportunity.
Troubleshoot
Reference Manual
October 2019
00809-0100-4340
148
Emerson.com/Rosemount
Summary of Contents for Rosemount Oxymitter 4000
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