Normally Thermal Mass Flow Meter Problems and Troubleshooting
After checking out above issues, please process trouble shooting according to following description.
| Problem | Possible Cause | Solution |
| Velocity measurement is erractic or fluctuating | Very erractic or non-uniform flwo | Follow installation requirements shown in Comate thermal mass flow meter manual |
| Flow meter installed with less than required minimum pip diameters upstream and dlown stream of the sensor | Follow installation requirements shown in Chapter 2 | |
| Insertiong sensor probe not mounted securely | Sensor probe must be mounted securely without vibration | |
| Earthing circuit loop | Wire the meter according to the introduction in Comate thermal mass flow meter manual | |
| Liquid contains in fluid | Install a water filter in upstream of the meter | |
| Sensor failure | Return to factory for evaluation | |
| Transmitter failure | Return to factory for evaluation | |
| The measuring flow is too high or too low | Sensor is not inserted to the middle of the pipe line | Please fix the sensor in the middle of the pipeline |
| The flowmeter is not vertical to the center line of the pipe line | Re-install the meter and make the probe vertical to the center line of the pipe line | |
| No flow measured | The limit of small signal cut off is set too high | Set the small signal cut off limit to a lower and proper value |
| The flow rate in pipeline is smaller than the lower limit of the meter | Contact the supplier | |
| The flow rate in pipeline is larger than the higher limit of the meter | Contact the supplier | |
| Flow profile distortion | Try to find another location for the meter | |
| Sensor failure | Return to factory for evaluation | |
| Transmitter failure | Return to factory for evaluation | |
| Extremely turbulent flow | Do not place the meter near a ventilator static mixer or valve |
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