Phenomenon |
Reason |
Treatment Measures |
| No display when fluid is flowing normally |
1. Power cord, fuse, etc. have a break or poor contact. | 1. Use an ohm meter to troubleshoot. |
| 2. Poor contact inside the display. | 2. Use the replacement “spare version” method to check. |
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| 3. The coil has broken wires. | 3. Check the coil for broken wires or solder joint desoldering. |
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| 4. There is a fault inside the sensor circulation channel. | 4. Remove the sensor’s foreign matter, and clean or replace the damaged parts. | |
| Flow shows a gradual decline | 1. The filter is clogged. | 1. Clean the filter. |
| 2. The valve spool on the sensor pipe section is loose and the valve opening is reduced. | 2. Judging whether the valve spool is loose or not from whether the valve handwheel adjustment is effective. | |
| 3. The sensor impeller is obstructed by debris or the bearing gap enters foreign matter and the resistance increases. | 3. Remove the sensor to clear the debris, and recalibrate if necessary. | |
| The fluid does not flow, flow rate display is not zero |
1. Poor grounding of the transmission line shield. | 1. Check if it is well-grounded. |
| 2. The pipe vibrates and the impeller shakes with it. | 2. Reinforce the pipeline, or install brackets in front and behind the sensor to prevent vibration. | |
| 3. The shut-off valve is not closed tightly. | 3. Overhaul or replace the valve. | |
| 4. The display instrument’s internal circuit board between or electronic components deterioration damage. |
4. Take the “short-circuit method” or item-by-item inspection to determine the source of interference and find out the point of failure. | |
| A significant difference between the displayed value and the empirically assessed value |
1. Internal failure of the sensor circulation channel. |
1-4. Identify the cause of the failure and find countermeasures for the specific cause. |
| 2. Insufficient sensor back pressure and cavitation, which affects impeller rotation. |
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| 3. Reasons for pipeline flow. | ||
| 4. Internal failure of the display. | ||
| 5. The permanent magnet material element in the detector is demagnetized by aging. |
5. Replace the loss of magnetic components. |
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| 6. The actual flow rate flowing through the sensor has exceeded the specified range. |
6. Replace the appropriate sensor. |