Differential pressure liquid level gauge common fault judgment and solution

What is the working principle of differential pressure level gauge? What are the advantages and disadvantages of differential pressure level gauges? How to deal with common faults of differential pressure liquid level gauge? Advantages and disadvantages of differential pressure liquid level gauge: Differential pressure liquid level measurement has no mechanical wear, simple structure, easy operation and maintenance, and is suitable for most occasions at normal temperature and pressure. Disadvantages: Due to the limitation of the principle, this type of liquid level gauge measures the pressure first and then converts it into the liquid level, and the accuracy is not very high. When there is steam in the container, it will condense into liquid in the negative-phase pressure tube, causing serious measurement errors. The pressure pipe is installed with a liquid storage tank, and manual drainage is carried out on a regular basis; when the weather is cold, the liquid in the pressure pipe is easy to solidify, and heat tracing is required; when it is put into use, it is troublesome, and the pressure pipe of the transmitter must be filled with water or other water vapor The condensate can only be used accurately after filling the pressure tube; the comprehensive error of the measurement is large, the accuracy of the transmitter's measurement error is limited, coupled with the instability of the liquid column in the sampling pipeline and other factors, the comprehensive error of the actual measurement is relatively high. big. Differential pressure liquid level gauge fault judgment The device that uses liquid column to generate pressure to measure liquid level height is called differential pressure liquid level gauge, differential pressure transmitter, double flange differential pressure transmitter, single flange liquid level Transmitters and submersible level transmitters are common differential pressure level gauges. The change speed of the liquid level parameter is closely related to the volume of the container, which should be judged according to the actual situation to determine whether the change speed of the liquid level is normal. For example, the water level of the boiler drum (used to measure the water level of the steam drum with a differential pressure transmitter) changes quickly, but the liquid level of the liquid storage tank changes slowly. When the liquid level display suddenly shows large changes and fluctuations, such as when the maximum or minimum indication is indicated, the differential pressure level gauge is likely to fail. When the liquid level display value reaches the maximum or minimum, the differential pressure liquid level gauge should be checked first. If the transmitter is normal, most of the display instruments are faulty. If the output of the transmitter is consistent with the display of the display instrument, the liquid level control system can be changed to manual operation, that is, the opening of the regulating valve can be manually changed to observe whether the liquid level changes. The reason, if there is no change, the differential pressure level gauge is faulty. When the liquid level recording curve fluctuates greatly and fast, it may be that the PID parameters of the regulator are not properly set, or the parameters have changed. The damping of the differential pressure liquid level gauge is not adjusted properly, and the leakage of the pressure guiding pipeline may cause the fluctuation of the liquid level recording curve. The most fearful thing about measuring the liquid level is the occurrence of false liquid level. You can switch the control system to manual operation, and then check or correct the differential pressure liquid level gauge and system, and check whether there are any problems with all pressure guiding pipelines and valves. Find out what's wrong. Fault inspection and treatment of differential pressure liquid level gauge: 1. Inspection and treatment method of abnormal liquid level display or no change fault Common faults and treatment of pressure liquid level transmitter If there is an abnormality in the liquid level measurement, you should first determine whether it is an abnormal process liquid level or a problem with the measurement system. If it is confirmed that it is a problem with the measurement system, the cause of the failure should be analyzed according to the failure phenomenon. Common faults and treatment methods of differential pressure liquid level transmitters are shown in Table 1. Table 1 Common faults and treatment methods of differential pressure liquid level transmitters

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