TABLE OF CONTENTS Mechanical systems
Process connections
Pneumatic systems
Electrical systems
Electronic systems
Valves
Calibration
Programmable electronic systems
Communication circuits
Transients
Software
| Note | The troubleshooting scenarios in this chapter are drawn from actual experience. They are brief and may not apply to the specific equipment you will be working on. Also, they do not include safety precautions. Always follow company and industry safety procedures and standards. |
| PROBLEM: Pressure recorder chart reading zero. | |
|---|---|
| ACTION | RESULT |
| 1. Examine chart. | Chart indicates reading went to zero suddenly. |
| 2. Remove chart and cover. | Examine instrument. Mechanical linkage between bellows and recorder pen arm has come loose. |
| 3. Reinstall, then check calibration. | Problem solved. |
| PROBLEM: Pressure recorder chart reading incorrectly. | |
|---|---|
| ACTION | RESULT |
| 1. Examine chart. | Examination indicates nothing unusual. |
| 2. Remove chart and cover, then simulate signal to input bellows. | At the high end, the recorder is off by about 10%. |
| 3. Examine linkage arm between bellows and pen arm. | Looks slightly bent, probably due to an overpressure event. |
| 4. Replace link, reinstall, and test. | Problem solved. |
| PROBLEM: Pressure recorder chart did not read properly. | |
|---|---|
| ACTION | RESULT |
| 1. Examine chart. | Chart is not turning. |
| 2. Remove chart and cover to examine chart motor. | Motor not wound following last chart replacement. |
| 3. Wind motor. | Problem solved. |
| PROBLEM: Pressure transmitter is not reading correctly. | |
|---|---|
| ACTION | RESULT |
| 1. Check recorder... |
