| Phenomenon | reason | Solution |
The flow meter does not display when the fluid is flowing normally | 1.The power cord, fuse, etc. are disconnected or have poor contact. | 1. Check with an ohmmeter. |
| 2. The internal contact of the display device is poor. | 2. Use the method of replacing the "alternative version" to check. | |
| 3.The coil is disconnected. | 3. Check whether the coil is disconnected or the solder joint is de-soldered. | |
| 4. There is a fault inside the sensor flow channel. | 4. Remove foreign objects from the sensor and clean or replace damaged parts. | |
Traffic gradually decreases | 1. The filter is clogged. | 1. Clean the filter. |
| 2. The valve core on the sensor pipe section is loose, and the valve opening is reduced. | 2. Judging whether the valve core is loose or not from whether the valve handwheel adjustment is effective. | |
| 3. The sensor impeller is blocked by debris or the bearing gap enters the foreign body, and the resistance increases. | 3. Remove sensor to clear debris and recalibrate if necessary. | |
The fluid does not flow, and the flow rate display is not zero | 1. The shielding of the transmission line is poorly grounded. | 1. Check whether the grounding is good. |
| 2. The pipeline vibrates, and the impeller vibrates accordingly. | 2. Reinforce the pipeline, or install brackets before and after the sensor to prevent vibration. | |
| 3. The globe valve is not closed tightly. | 3. Overhaul or replace the valve. | |
| 4. The internal circuit board or electronic components of the display instrument are aging and damaged. | 4. Take the "short-circuit method" or check item by item to determine the source of interference and find the fault point. | |
There is a significant difference between the instrument display value and the empirical evaluation value | 1. Internal failure of the sensor flow channel. | Find out the cause of the failure and find out the countermeasures for the specific cause. |
2. The back pressure of the sensor is insufficient, resulting in cavitation, which affects the rotation of the impeller. | ||
| 3. The reason for the flow of the pipeline. | ||
| 4. Display the internal fault of the instrument. | ||
| 5. The permanent magnet material elements in the detector will lose their magnetism over time. | 5. Replace the demagnetization element. | |
| 6. The actual flow through the sensor is out of specification. | 6. Replace the appropriate sensor. |