The metal tube rotameter consists of a cone tube, a float, an indicator, and a converter. When the fluid flows into the cone float, when the lift M is balanced with the gravity G, the displacement of the float is transmitted to the indicator by the magnetic steel to indicate the flow or to be converted into a corresponding electrical signal by the converter (two-wire 4-20 mA, three-wire) 0-10 mA, 4-20 mA, 0-20 mA) can be matched with DDZ-II, DDZ-III electric unit combination meter, I series, EK series, etc. Remote display, recording, adjustment, integration and control. The usual faults are as follows: 1. The reason why the pointer does not move when the system is turned on: the medium contains impurities, which makes the rotor jam; the working pressure of the system is too small, causing the meter to not work properly. Solution: Remove foreign matter; increase magnetic filter to increase system working pressure. 2. The reason why the pointer does not recover is that the medium contains impurities, which makes the rotor jam; the instrument selection is not suitable, and the instrument is too small. Solution: remove foreign matter and increase the magnetic filter; 3, the reason that the pointer fluctuation is too large: can not accurately read, the cause: the system working pressure is unstable; the medium has pulsating flow or two-phase flow phenomenon; the pipe diameter change at the inlet and outlet of the instrument leads to pressure change or pressure loss increase. Solution: Check your system; eliminate pulsating flow and two-phase flow. Reduce pressure loss. 4. The reason why the pointer does not return to zero: the pointer is displaced due to the fluctuation of the meter; the parts in the measuring tube are bent and deformed due to the up and down impact of the meter. Solution: Loosen the small screw at the pointer to restore the pointer to the inoperative state; it is recommended to return it for repair or replacement. 5, the remote transmission is not accurate Cause: the ambient temperature exceeds the working requirements; the transmitter drifts. Solution: Use as required; adjust the potentiometer or adjustment screw in the transmitter to restore normal. 6. No display when the fluid is flowing normally, the total number of counters does not increase: check the power cord, fuse, function selection switch and signal line for open circuit or poor contact; check the internal printing plate of the display, contact parts, etc. for poor contact; Check the detection coil; check the internal fault of the sensor. The above 1-3 items are all confirmed to be normal or have been eliminated, but there is still a fault phenomenon, indicating that the fault is inside the sensor flow channel, and it can be checked whether the impeller touches the inner wall of the sensor, and whether there is a foreign matter card. Live, shaft and bearing are free of debris or breakage. Solution: Use ohmmeter to check the fault point; print board fault check can replace the "alternate version" method, replace the fault board and make a detailed inspection; do the position mark of the detection coil on the sensor body, unscrew the test head, use The iron piece moves quickly under the detecting head. If the number of counters does not increase, the coil should be inspected for broken wires and solder joints. The foreign matter is removed, and the damaged parts are cleaned or replaced. After the recovery, the air blows or the hand moves the impeller. No friction sound, after re-calibrating parts such as bearings, re-verify and obtain a new meter factor. 7. The flow operation is not reduced, but the flow display is gradually decreased: whether the filter is clogged, if the filter differential pressure increases, indicating that the debris has been blocked; the valve on the flow sensor pipe section has a loose spool, and the valve opening is automatic. Reduced; the sensor impeller is obstructed by debris or the bearing gap enters the foreign object, the resistance increases and the deceleration slows down. Solution: Eliminate the filter; judge from the valve handwheel whether it is adjusted effectively, and then repair or replace it after confirming; remove the sensor to clear and re-verify if necessary. 8. The fluid does not flow, the flow display is not zero, or the display value is unstable: the transmission line shield is poorly grounded, and the external interference signal is mixed into the input end of the display; the pipeline vibrates, the impeller vibrates accordingly, and the false signal is generated; As a result, the meter actually displays the amount of leakage; interference caused by deterioration of the internal circuit boards of the display or electronic components. Solution: Check the shielding layer, whether the display terminal is well grounded; Reinforce the pipeline, or install brackets before and after the sensor to prevent vibration; Check or replace the valve; Take “short circuit method†or check one by one to judge the interference source and detect the fault. point. 9. The difference between the display instrument value and the empirical evaluation value is significant: the internal fault of the sensor flow channel is corroded by fluid, the wear is serious, the debris obstructs the impeller rotation, the instrument coefficient changes the blade is corroded or impacted, the top deformation, affecting the normal cutting magnetic field line The detection coil output signal is abnormal, and the meter coefficient changes: the fluid temperature is too high or too low, the shaft and the bearing expand or contract, and the gap change is too large, causing the impeller to rotate abnormally, and the meter factor changes. Insufficient back pressure of the sensor, air pockets, affecting the flow of the impeller rotating pipeline, such as the reverse flow bypass valve is not closed when the check valve is not installed, and there is a large flow velocity distribution distortion upstream of the leak sensor: (eg due to the upstream valve (not caused by full opening) or the pulsating liquid is subject to temperature-induced viscosity change, etc.; internal fault of the display; aging of the permanent magnet material component in the detector, magnetic attenuation to a certain extent will also affect the measured value; The actual flow has exceeded the flow range specified by the sensor. Solution: Find out the cause of the malfunction, find a countermeasure for the specific reason; replace the loss-of-magnetic component; replace the appropriate sensor.
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How to eliminate the fluctuation of the rotor flowmeter pointer