Turbine flow sensor common faults and solutions First, there is no display when the fluid is flowing normally, and the total number of counters does not increase. 　　 1. Check the power cord, fuse, function selector switch, and signal line for open or bad contacts 　　 2. Check the internal printing plate of the display device, whether the contacts are in poor contact 　　 3. Check the detection coil 　　 4. Check the internal fault of the sensor. The above 1-3 inspections are all confirmed to be normal or the fault has been eliminated. However, there is still a fault phenomenon. This indicates that the fault is inside the sensor flow channel and it can check whether the impeller touches the inner wall of the sensor and there is no foreign matter stuck. And whether the bearing has stuck or broken phenomenon solution 　　 1. Use ohmmeter to troubleshoot the fault 　　 2. Printed board failure inspection can replace the "backup version" method, replace the fault board and make a detailed inspection 　　 3. Make the position mark of the detection coil on the sensor body, rotate the detection head, and use the iron piece to move quickly under the detection head. If the number of the counter does not increase, check whether the coil is disconnected and the welding spot is not welded. 　　 4. Remove foreign matter, and clean or replace damaged parts. After recovery, air blow or hand toggle the impeller, there should be no friction sound. After replacement of bearings and other parts should be re-calibrated to obtain a new meter factor Second, no reduction in flow operation, but the flow rate gradually decreased 　　 1. If the filter is clogged, if the pressure difference of the filter increases, the debris is blocked 　　 2. Looseness of the valve on the valve of the flow sensor tube segment, valve opening automatically reduced 　　 3. The sensor impeller is obstructed by debris or the bearing clearance enters foreign matter, resistance increases and deceleration slows down solution 　　 1. Elimination filter 　　 2. From the valve handwheel whether to adjust the effective judgment, confirm and then repair or replace 　　 3. Remove the sensor and re-check if necessary Third, the fluid does not flow, the flow display is not zero, or the display value is unstable 　　 1. The transmission line shield is poorly grounded, and external interference signals are mixed into the input of the display. 　　 2. The pipeline vibrates, the impeller fluctuates and generates false signals 　　 3. The closing valve is not closed due to leakage, in fact, the meter shows the amount of leakage 　　 4. Interference between internal circuit boards or electronic components of the display device solution 　　 1. Check the shielding layer, and the display terminal is well grounded 　　 2. Reinforce the pipeline, or install brackets before and after the sensor to prevent vibration 　　 3. Check or replace the valve 　　 4. Take “short-circuit method†or check item by item to determine the source of interference and identify the point of failure IV. Significant difference between display instrumentation and experience evaluation 　　 1. The internal flow of the sensor's flow channel is corroded by the fluid and the wear is serious. Impediments to the rotation of the impeller cause the impeller to rotate abnormally. The coefficient of the meter changes. The blade is corroded or impacted. The top of the sensor is deformed, affecting the normal cutting of the magnetic flux, the output signal of the detection coil is abnormal, and the meter coefficient changes: If the fluid temperature is too high or too low, the shaft and the bearing expand or contract. If the clearance changes too much, the impeller rotates abnormally and the meter factor changes. 　　 2. Insufficient back pressure of the sensor, air pockets, impeller rotation 　　 3. Pipe flow reasons, such as the absence of a check valve reverse flow bypass valve is not tight, there is a large flow rate distortion upstream of the leak sensor: ( such as due to the upstream valve is not fully open ) or the occurrence of pulsating liquid Temperature-induced changes in viscosity, etc. 　　 4. The internal fault of the display 　　 5. The permanent magnetic material element in the detector is deactivated for a long period of time, and the magnetic weakening to a certain extent will also affect the measured value. 　　 6. Actual flow through the sensor has exceeded the sensor's specified flow range solution 　　 1-4. Finding the Cause of the Failure and Finding the Solution to the Specific Cause 　　 5. Replace the loss of magnetic components 　　 6. Replace the appropriate sensor
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