Emerson Rosemount CT4400 Reference Manual page 80

Troubleshooting and diagnostics
January 2020
3. Perform a new Zero and Span calibration to ensure calibration factors are correct.
4. Readings do not return to normal.
5. Check calibration cylinder.
6. Calibration cylinder near empty.
7. Replace calibration cylinder.
8. Readings return to normal.
9. Cylinder was empty.
Potential cause
Calibration cylinder empty.
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 do not return to normal.
5. Check calibration cylinder.
6. Calibration cylinder near empty.
7. Replace calibration cylinder.
8. Readings do not return to normal.
9. Check the calibration pipework.
10. Pipework damaged.
11. Replace pipework.
12. Readings return to normal.
13. Pipework was damaged.
Potential cause
Pipework damaged empty.
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 do not return to normal.
5. Check calibration cylinder.
6. Calibration cylinder near empty.
7. Replace calibration cylinder.
8. Readings do not return to normal.
9. Check the calibration pipework.
10. Pipework damaged.
11. Replace pipework.
12. Readings do not return to normal.
80
Reference Manual
00809-0100-4244
Rosemount CT4400