Reasons for Signal Distortion of Differential Pressure Flow Meter

Abstract: The information on the causes of signal distortion of differential pressure flowmeters is provided by excellent flowmeter and flowmeter manufacturers. In the installation standard specification of the differential pressure flowmeter, the laying of the impulse pipe and the installation of the instrument are generally only briefly mentioned, that is, the differential pressure signal should not have transmission distortion. In fact, it is very difficult to truly achieve undistorted transmission of differential pressure signals. Have. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the causes of signal distortion of differential pressure flowmeters. In the installation standard specification of the differential pressure flowmeter, the laying of the impulse pipe and the installation of the instrument are generally only briefly mentioned, that is, the differential pressure signal should not have transmission distortion. In fact, it is very difficult to truly achieve undistorted transmission of differential pressure signals. Facts prove that: when the differential pressure flowmeter has just stopped, or the valve on the pipeline equipped with the primary device of the differential pressure flowmeter is closed, and confirm that the flow through the flowmeter has dropped to zero, from the specific flow From the reading point of view, there are not many real indications of zero. Among them, the main cause of zero point drift is mostly the distortion in the process of differential pressure transmission. The transmission distortion of the differential pressure signal makes the differential pressure signal received on the differential pressure transmitter not equal to the differential pressure signal generated by the differential pressure flowmeter, thereby causing additional errors. Differential pressure signal transmission distortion includes steady-state value distortion and dynamic distortion. Under the condition of steady flow, there is only steady-state value distortion. Under the condition of pulsating flow, there may be both steady-state value distortion and dynamic distortion. The possible positions and reasons for the distortion of the steady state value are: unreasonable direction of the pressure guiding pipe; improper setting of the shut-off valve; unequal height of the condenser; unequal height of the isolation liquid; The density of the medium is not equal; the three-valve group accumulates fluid, etc. (1) The error caused by the unreasonable direction of the pressure guiding pipe and the improper setting of the shut-off valve is the most easily caused in the differential pressure steam flowmeter, and should be installed in strict accordance with the installation standard specifications. When the equalizing tube differential pressure flowmeter is used to measure the low-pressure gas flow that may precipitate condensate, the needle-shaped shut-off valve set horizontally may cause the condensate to accumulate in the valve and block the gas path, resulting in the distortion of the differential pressure signal. (2) For the error caused by the unequal height of the condensers, the structures of the two condensers on the positive and negative pressure pipes should be symmetrical, and the installation heights should be equal, so that it is possible to make the liquid levels in the two condensers equal, because the difference in liquid level heights is 1mm. A differential pressure distortion of 10Pa will be introduced. However, it is common that the installation heights of the two condensers are not equal at the use site, and some even turn the condenser upside down, which does not function as a condenser at all. One of the positive and negative pressure taking ports of the elbow flowmeter is opened in the outer ring of the elbow, and the other is opened in the inner circle of the elbow. When the diameter of the pipe is large, it is easy to cause the height to be unequal. The signal is inherently small, so the differential pressure signal transmission distortion is not too large in terms of the absolute value of the differential pressure, but the relative error of the flow measurement caused is considerable. (3) The error caused by the unequal height of the isolating liquid level, the isolator in the pressure-improving pipeline is to use the isolating liquid to isolate the corrosive medium from the differential pressure transmitter. When the isolation liquid is just filling the tank, the isolation liquid level of the two isolation containers can be made the same through the balance valve of the three-valve group. However, after a period of operation, due to the leakage of spacer fluid or the wrong opening of the balancing valve during operation, the height of the spacer liquid may be unequal, thereby introducing additional differential pressure and causing distortion of the differential pressure signal. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The Cause of Signal Distortion of Differential Pressure Flow Meter'

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