Emerson Rosemount CT4400 Reference Manual page 79

Reference Manual
00809-0100-4244
3. Perform a new Zero and Span calibration to ensure calibration factors are correct.
4. Readings return to normal.
5. Sensor required calibration.
Potential cause
Gas reading abnormal
Recommended action
1. Check measurement validity flag.
2. Reading valid.
3. Perform a new Zero and Span calibration to ensure calibration factors are correct.
4. Abnormal readings persist.
5. Cause Unknown.
6. Contact (cascade.support@emerson.com).
Related information
Measurement invalid flag.
7.5.2 Calibration/validation drift
Potential cause
Sensor reading invalid.
Recommended action
1. Check measurement validity flag.
2. Reading is invalid.
3. refer to Measurement invalid flag.
Potential cause
Sensor required calibration.
Recommended action
1. Check measurement validity flag.
2. Reading is valid.
3. Perform a new Zero and Span calibration to ensure calibration factors are correct.
4. Readings return to normal.
5. Sensor required calibration.
Potential cause
Sensor does not require calibration.
Recommended action
1. Check measurement validity flag.
2. Reading is valid.
Reference Manual
Troubleshooting and diagnostics
January 2020
79