What are the factors affecting ultrasonic flowmeters?

Project Overview

Ultrasonic flowmeter plays an important role in industry and life. It is a device used to measure fluid flow rate and flow rate. Ultrasonic flow meters calculate the flow rate and flow rate of fluids by sending ultrasonic signals and measuring the propagation time of the signals. They have the advantages of non-contact, no pollution, high precision, and strong reliability, so they are widely used in various fields.

However, the ultrasonic flowmeter may be affected by a variety of interference factors during the measurement process. These interferences can be roughly divided into two categories: internal interference and external interference.

1. Internal interference

Internal interference mainly comes from the components or working characteristics of the flow meter itself, including but not limited to:

(1) Structure on the inner wall of the pipeline Scale: Scale on the inner wall of the pipeline will affect the propagation of ultrasonic waves and lead to measurement errors of the flow meter. The solution is to use a cleaning device to remove sediment from the pipes.

(2) Solid particles or bubbles in the liquid medium: These impurities will also interfere with the propagation of ultrasonic waves and affect the measurement accuracy. It can be detected by using a settler or gas detector and removed in time.

(3) Power supply fluctuation: When the power supply fluctuation range is large, it may also lead to errors in the flow meter. This can be solved by calibrating with a power supply regulator.

Hesheng Measurement and Control Ultrasonic Flowmeter

II. External interference

External interference mainly comes from the working environment of the flowmeter, including but not limited to:

(1) ) Pipe vibration: Pipe vibration will cause errors in the flow meter. To mitigate this interference, compensators can be installed or pipe supports reinforced.

(2) Ambient temperature: Changes in ambient temperature may also affect the measurement accuracy of the flow meter. This can be calibrated using temperature compensation methods.

(3) Noise: Noise in the environment, such as mechanical noise, electromagnetic noise, etc., may affect the measurement of ultrasonic flow meters. Noise disturbance can be reduced by using soundproofing measures or filters.

(4) Electromagnetic wave interference: In workplaces with complex electromagnetic environments, electromagnetic waves may interfere with the measurement signals of ultrasonic flow meters. This interference can be reduced by using filters to isolate spurious signals.

(5) Electric field and magnetic field interference: There may be large electric fields and magnetic fields in the installation environment of the flow meter, which will also affect its measurement. When installing, try to stay away from sources of strong electric and magnetic fields.

(6) Water pump noise: When the flow meter is installed close to the water pump, the noise brought by the water pump may be close to the frequency of the ultrasonic signal, thus causing interference. At this time, measures should be taken to isolate or reduce the noise of the water pump.

3. Other interference factors

In addition to the above-mentioned internal and external interference, there are some other factors that may also affect the measurement accuracy of the ultrasonic flowmeter, such as:

(1) Interference of the transmitting signal to the receiving signal: When the distance between transducers is very close or the pipe diameter is small, the transmitting signal may be coupled to the receiving circuit through the circuit and acoustic path, affecting the accuracy of the received signal.

(2) Wiring problems: Unreasonable wiring may cause crosstalk or coupling interference between signal lines. Reasonable wiring techniques should be adopted, such as relatively separating analog signal lines and digital signal lines, and separately wiring signal lines and power lines, etc.

In order to ensure measurement accuracy and reliability, appropriate measures need to be taken to reduce or eliminate these interferences. There are many types of ultrasonic flowmeters, including insertion ultrasonic flowmeters, pipe segment ultrasonic flowmeters, clamp-on ultrasonic flowmeters, portable ultrasonic flowmeters, handheld ultrasonic flowmeters and explosion-proof ultrasonic flowmeters. When selecting and installing, you can contact the measurement and control technicians of Qingdao and Shengsizhuang, and make your selection based on actual working conditions.