How to eliminate the fluctuation of the pointer of the rotor flow meter

Abstract: The information on how to eliminate the fluctuation of the pointer of the rotor flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Metal tube rotameter is composed of cone tube, float, indicator and converter. When the fluid flows into the conical tube float and rises, when the lift M is balanced with the gravity G, the displacement of the float is transmitted to the indicator through the magnetic steel to indicate the flow on the spot or converted into the corresponding by the converter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to eliminate the fluctuation of the rotor flowmeter pointer. The metal tube rotameter consists of a cone tube, a float, an indicator and a converter. When the fluid flows into the conical tube and the float rises, when the lift M is balanced with the gravity G, the displacement of the float is transmitted to the indicator through the magnetic steel to indicate the flow on the spot or converted into a corresponding electrical signal by the converter (two-wire system 4-20mA, three-wire system) 0-10 mA, four-wire system 4-20 mA, 0-20 mA) can be matched with DDZ-Ⅱ, DDZ-Ⅲ electric unit combination instrument, I series, EK series and other instruments, and can also be networked with a computer to realize flow Remote display, recording, adjustment, accumulation and control. The faults that usually occur are as follows: 1. Reasons for the pointer not moving when the system is turned on: the medium contains impurities, which makes the rotor stuck; the working pressure of the system is too small, causing the instrument to work abnormally. Solution: Remove foreign objects; increase the magnetic filter to increase the working pressure of the system. 2. The reason why the pointer does not return to the top: the medium contains impurities, which makes the rotor stuck; the instrument selection is not suitable, and the instrument is too small. Solution: remove foreign objects and add a magnetic filter; 3. The reason for the fluctuation of the pointer is too large: the reading cannot be accurately read, the reason: the working pressure of the system is unstable; the medium has pulsating flow or two-phase flow; Large changes in pipe diameter lead to pressure changes or increased pressure loss. Solution: Check own system; eliminate pulsating flow and two-phase flow. Reduce pressure loss. 4. The reasons why the pointer does not return to zero: the pointer is displaced due to the fluctuation of the instrument; the parts in the measuring tube are bent and deformed due to the up and down impact of the instrument. Solution: Loosen the small screw at the pointer to restore the pointer to a non-working state; it is recommended to send it back for repair or replacement. 5. Reasons for inaccurate remote transmission: the ambient temperature exceeds the working requirements; the transmitter drifts. Solution: Use as required; properly adjust the potentiometer or adjusting screw in the transmitter to return to normal. 6. There is no display when the fluid flows normally, and the total counter does not increase the number of words: check whether the power cord, fuse, function selection switch and signal line are open or not in contact; Check the detection coil; Check the internal fault of the sensor, the above 1-3 items are confirmed to be normal or the fault has been eliminated, but there is still a fault phenomenon, indicating that the fault is inside the sensor flow channel, you can check whether the impeller touches the inner wall of the sensor, and whether there is any foreign matter stuck Check whether the shaft and bearing are stuck or broken. Solution: use an ohmmeter to check the fault point; the printing board fault check can be replaced by replacement“Alternate version”method, replace the faulty board and then make a detailed inspection; mark the position of the detection coil on the sensor body, unscrew the detection head, and use the iron plate to move quickly under the detection head. If the number of counter words does not increase, check whether the coil has Wire breakage and desoldering of solder joints; remove foreign objects, and clean or replace damaged parts. After restoration, air blow or manually move the impeller, and there should be no friction sound. After replacing bearings and other parts, re-calibration should be performed to obtain a new meter coefficient. 7. The flow reduction operation is not performed, but the flow display gradually decreases: whether the filter is blocked, if the pressure difference of the filter increases, it means that the sundries are blocked; the valve core of the flow sensor pipe section is loose, and the valve opening automatically Reduce; the sensor impeller is blocked by debris or the bearing gap enters the foreign body, the resistance increases and the deceleration slows down. Solution: Eliminate the filter; judge whether the valve handwheel is effectively adjusted, and then repair or replace it after confirmation; remove the sensor to clear it, and re-calibrate if necessary. 8. The fluid does not flow, the flow rate display is not zero, or the display value is unstable: the transmission line is poorly shielded and grounded, and external interference signals are mixed into the input end of the display instrument; the pipeline vibrates, and the impeller vibrates accordingly, resulting in false signals; the shut-off valve is not tightly closed and leaks As a result, the meter actually shows the leakage; the interference between the circuit boards inside the display or the deterioration and damage of electronic components. Solution: Check the shielding layer and whether the terminal of the indicator is well grounded; Reinforce the pipeline, or install brackets before and after the sensor to prevent vibration; overhaul or replace the valve; take“short circuit method”Or check item by item to determine the source of interference and find out the fault point.

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