High pressure ultrasonic flowmeter | The "interference enemy" of ultrasonic flowmeter - analysis of common interference sources

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1. Application and troubleshooting of ultrasonic flowmeter?

1. Measurement principle of ultrasonic flowmeter Ultrasonic flowmeter is a non-contact flowmeter. The working principle is that the propagation speed of ultrasound in a fluid is affected by the fluid velocity. By measuring the propagation speed of ultrasound in a fluid, the fluid velocity can be detected and the flow rate can be converted. Taking the widely used time difference method ultrasonic flowmeter as an example, when ultrasonic waves propagate in a fluid, the propagation speed of the ultrasonic waves in the downstream direction increases and the reverse direction decreases, that is, the same propagation distance has different propagation times. Then, the flow rate is calculated by using the relationship between the difference in propagation speed and the measured fluid flow velocity to convert the flow rate. When the ultrasonic beam propagates between the "upstream sensor" and the "downstream sensor" in the direction of water medium flow in the pipeline, the flow of water will cause a small change in the propagation time of the ultrasonic beam relative to static propagation, and this change in propagation time is proportional to the flow velocity of water. This is the measurement principle of the time difference ultrasonic flowmeter. The theoretical expression of its relationship is as follows: V=MD/sin2 θ × △ T/TupDown. In the formula, M - is the number of straight line propagation times of the ultrasonic beam in hydroponics. θ - is the angle between the ultrasonic beam and the water flow direction. Tup - is the propagation time of the ultrasonic beam in the positive direction (from the upstream sensor to the downstream sensor). Tdown

Secondly, the characteristics of ultrasonic flow meters. Ultrasonic flow meters are based on microprocessing technology and are mostly designed using integrated circuits and low-voltage wide pulse emission technology. In terms of measurement technology, in order to achieve higher resolution and larger measurement range, 0.1ns ultra-high resolution time measurement is often used for the measurement and distribution of the Zhen Sui measurement line. It is specifically used for measuring liquid media, especially water. Its significant feature is that the accuracy level is ± 1.0%, and it can be installed under pressure without stopping production. The host can be installed in the value control room and can output standard signals such as current and pulse, and can use RS232 or RS485 interface communication for remote transmission of measurement data. This flowmeter has the advantages of high reliability, low power consumption, anti-interference, and easy installation and maintenance.

III. Basic Structure and Main Installation Methods of Ultrasonic Flow Meter

1. Structure of Ultrasonic Flow Meter Ultrasonic flow meters can generally be divided into three parts: on-site sensors (i.e. probes), transmission cables, and display hosts.

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