Analysis of Signal Transmission Distortion and Errors Introduced in Differential Pressure Flow Meters

Abstract: Analysis of signal transmission distortion and introduced error information in differential pressure flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Changzhou Chengfeng has built a factory for 30 years. It has been learning and making progress. It has learned the advanced technology of foreign instruments and equipment, introduced advanced technology, and then developed new technologies on this basis, combined with customer requirements to innovate products to meet customers' requirements. need,. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article analyzing the signal transmission distortion and the errors introduced in the differential pressure flowmeter. Thirty years after the establishment of the factory, we have been learning and making progress, learning advanced technology of foreign instruments and equipment, introducing advanced technology, and then developing new technologies on this basis, innovating products according to customer requirements, meeting customer needs and satisfying The requirements of customers, the pursuit of perfection in quality and breakthrough in technology. In the 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. It is proved by facts: when the device has just stopped, or the valve on the pipeline equipped with the primary device of the differential pressure flowmeter is closed under conditions, and it is confirmed that the flow through the flowmeter has dropped to zero, from the specific flowmeter reading , 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 throttling device, thereby causing additional errors. Differential pressure signal transmission distortion includes steady-state value distortion and dynamic distortion. Under steady flow conditions, only steady-state value distortion exists, while under pulsating flow conditions, both steady-state value distortion and dynamic distortion may exist. This section focuses on steady-state value distortion. The possible locations and causes of the distortion of the steady state value include 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 level, unreasonable slope of the positive and negative pressure guiding pipes, and medium in the pipe. The density is not equal, and the three-valve group accumulates fluid, etc. 1. The error caused by the unequal height of the isolating liquid level The isolator in the pressure-inducing pipeline is to isolate the corrosive medium of the isolating liquid from the differential pressure transmitter. When the isolation liquid is just filled, the three-valve balancing valve can make the isolation liquid level in the two isolation containers equal. The liquid levels are not equal in height, thereby introducing additional differential pressure. 2. Errors caused by the unreasonable direction of the pressure guiding pipe and the improper setting of the shut-off valve. When the differential pressure flowmeter of the velocity-averaging pipe is used to measure the low-pressure gas flow that may precipitate condensate, the needle-shaped shut-off valve set horizontally may cause the accumulation of condensate. When the gas path is blocked in the valve. 3. Errors caused by unequal heights of 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 the same, because a difference of 1mm between the liquid levels will cause A differential pressure distortion of 10Pa is 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. 4. Transmission distortion that may be introduced by the three-valve group The diameter of the three-valve group is very small. Generally, there is no major problem when measuring dry gas, steam and liquid, but when measuring low-pressure gas that may precipitate condensate, it is often A drop of condensate will be blocked in the flow path of the three-valve group placed horizontally, causing a large error. A simple solution to this problem is to change the installation direction of the differential pressure transmitter, change the flow path of the three-valve manifold from horizontal to vertical, and install the differential pressure transmitter at a high place. 5. The transmission distortion caused by the pressure-inducing pipeline ensures a reasonable slope of the pressure-inducing pipeline, so that the bubbles that may appear in the pipe will rise to the gas collector or the parent pipe quickly, so that the condensate that may appear in the pipe will sink to the subsidence quickly. in the drain valve, or in the main pipe. The development of the instrumentation industry and technological breakthroughs in the instrumentation industry are inseparable from the support and efforts of various instrumentation manufacturers. As a flow meter manufacturer, we strive to learn new technologies from others, introduce advanced equipment, and develop more technologies to meet the needs of more customers. Chengfeng flowmeter has also gradually sold its products abroad, which is widely loved by customers. The above is the whole content of this article,You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of Signal Transmission Distortion and Errors Introduced in Differential Pressure Flow Meters'
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