54 of 66Maintenance and Troubleshooting - 3654 Portable H2/N2 Analyzer
6.6.4 Troubleshooting Table
Table
Symptom | Cause | Possible Solution |
| Degassing | Adjust sample flow rate |
|
|
|
| Flow chamber and/or membrane not clean | Clean system |
|
|
|
| Sensor’s membrane not tight smooth and | Replace membrane and |
| wrinkle free | recalibrate |
|
|
|
Unstable |
| No gas bubbles should escape |
measurement |
| from the purge gas outlet during |
| Leaking solenoid valve | measurement. If the solenoid |
| leaks (more than 1 bubble in 15 | |
|
| |
|
| seconds) contact your Hach Ultra |
|
| representative. |
|
|
|
| An external power supply is used but the | Switch to battery power |
| power supply is not clean | |
|
| |
|
|
|
| Sample flow rate too low | Check flow rate |
|
|
|
| Degassing | Adjust forcing gas and/or sample |
| flow rate | |
|
| |
|
|
|
|
| Allow sample to flow past the |
|
| membrane to make sure the |
Low readings | Membrane is not at sample temperature | membrane is at sample |
|
| temperature before making |
|
| measurements |
|
|
|
| Membrane not clean | Clean system |
|
|
|
| Incorrect solubility curve | Change solubility |
|
|
|
| Incorrect calibration | Recalibrate |
|
|
|
|
| Allow sample to flow past the |
|
| membrane to make sure the |
| Membrane is not at sample temperature | membrane is at sample |
High readings |
| temperature before making |
| measurements | |
|
| |
|
|
|
| Incorrect solubility curve | Change solubility |
|
|
|
| Incorrect calibration | Recalibrate |
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|
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ORBISPHERE | Operator Manual |
