When you encounter these failures when using a mass flowmeter, just do this

When using a mass flowmeter to encounter these failures, just do it. The mass flowmeter directly measures the mass flow of the medium passing through the flowmeter, and can also measure the density of the medium and indirectly measure the temperature of the medium. The flow meter is flexible in configuration, powerful in function, and high in performance and price ratio. It is a new generation of flow meter. Then let's take a look at the faults that occur during use and how to deal with them. (1) The mass flowmeter has always been out of tolerance, and it has been checked that it is not installed on the same axis of the pipeline to generate stress, resulting in inaccurate measurement of the sensor, failure to calibrate to zero, and damage to the sensor. (2) The curve fluctuates greatly during the loading process. Two measures can be taken: ① Control the flow rate by controlling the valve, ② Reduce the influence of pipeline vibration and other factors by setting a small flow cut-off. (3) False metering occurs during use, even if there is no flow accumulation, it will change. It was confirmed by on-site inspection that the flange was asymmetrical when the flowmeter was installed, resulting in stress. (4) The electric control valve behind the flowmeter leaks. The nominal pressure of the electric control valve design is lower than the system pressure, so the valve cannot be closed. Replace the electric control valve whose nominal pressure is greater than the system pressure. (5) During the use of the flowmeter, it is necessary to regularly check whether the working parameters have changed. If there is a large deviation from the actual situation, re-calibrate the zero flow according to the method described in the manual. When calibrating, the rear valve should be closed so that the flow can fill the pipe. (6) The problem of gas-liquid two-phase and excitation current exceeding the limit occurs. Three measures can be taken to increase the system pressure: ①Reduce the back valve, ②Install the instrument at the outlet of the pump or at the lower part of the upward pipeline, ③Check whether the filter installed at the outlet of the pump conforms, it may be that the filter causes the pipeline to A gas-liquid two-phase flow occurs. (7) During the passing of the vehicle, there are more and less, and it is confirmed by on-site inspection that the electromagnetic valve located downstream of the flow meter is quickly closed, causing a strong fluid hydraulic impact, which has a great impact on the sensor. If the flow meter is connected to the electromagnetic The exchange position of the valve cuts off the influence of the solenoid valve on the flowmeter, so that the flowmeter can work normally. (8) There is an error in the PLC configuration of the mass flow meter and the quantitative loading control system. Two measures can be taken: ① Use Modbus protocol and RS-485 instead of 4-20mA and pulse signal output, so as to directly eliminate errors; Correct the processing to reduce the error as much as possible.

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