How to deal with the possible magnetic interference in the installation environment? Posted by : admin / Posted on : Sep 24， 2021

1. Overview of Ultrasonic Flowmeter
Ultrasonic flowmeter is a meter that measures the flow rate by detecting the effect of fluid flow on the ultrasonic beam (or ultrasonic pulse). The purpose is to solve some difficult problems in measurement. Ultrasonic flowmeter, which integrates computer and sensor technology, combines the research results of acoustics with modern electronic technology, and can be used to measure a variety of liquids.

2. Analysis of the source of noise
In the ultrasonic flowmeter measurement system, there are many types of noise source materials. like:
(1) Large electric and magnetic field interference that may exist in the installation environment of the flowmeter;
(2) The noise brought by the water pump when installed close to the water pump is close to the ultrasonic signal;
(3) The communication system carried by the operator;
(4) High-order harmonics in the power supply;
(5) The noise interference caused by the high frequency crystal oscillator on the circuit board. For noise sources from the outside, the main solution is to reduce the sensitivity of the circuit to noise, reduce noise pickup, and cut off the noise coupling path. For noise sources from the system, such as the circuit board, the signal ground is adopted. , Digital ground separation, multi-point grounding, and reasonable wiring solutions.

A noise problem must have three elements. First, there must be a noise source; second, there must be a receiver sensitive to noise; and third, there must be a coupling path that transmits noise from the source to the receiver. Therefore, in order to solve the noise problem, it must be solved from these three aspects.
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