The ultrasonic water flow meter is a meter that measures water flow by detecting the effect of water flow on ultrasonic beams (or ultrasonic pulses). The more commonly used methods are the time difference method and the Doppler method.
The time difference method can measure water, seawater, acid and alkali, edible oil, gasoline, alcohol, and other uniform liquids that can transmit and transmit ultrasonic waves.
If it is sewage, which contains impurities, bubbles, etc., an ultrasonic flowmeter based on the principle of the Doppler method is used.
Ultrasonic water flow meter types
According to the measurement principle
- Time difference method ultrasonic flowmeter;
- Frequency difference method ultrasonic flowmeter;
- Phase difference method ultrasonic flowmeter;
- Doppler ultrasonic flowmeter;
- Ultrasonic flowmeters for partially full pipes and river channels that combine liquid level measurement and average flow velocity measurement.
According to the way of use
- Portable ultrasonic flowmeter;
- Fixed (standard pipe section) ultrasonic flowmeter.
According to the installation method of the transducer
- Standard pipe section ultrasonic flowmeter;
- Clip-on ultrasonic flowmeter;
- On-site hole-opening plug-in ultrasonic flowmeter.
According to whether the transducer is in contact with the fluid
- Intrusive (contact) ultrasonic flowmeter;
- Non-invasive (non-contact) ultrasonic flowmeter.
According to the nature of the measured fluid
- Liquid ultrasonic flowmeter;
- Gas ultrasonic flowmeter.
According to the number of transducer channels
- Mono ultrasonic flowmeter;
- Two-channel ultrasonic flowmeter;
- Multi-channel ultrasonic flowmeter.
Featured Ultrasonic water flow meters
Why is it more appropriate to use a Doppler ultrasonic flowmeter to detect sewage pipes?
What kind of flow monitoring equipment should you choose for ordinary sewage pipes?
What kind of flow monitoring equipment should we choose for ordinary sewage pipelines?
The electromagnetic flowmeter can only measure the condition of the full tube. Therefore, the measurement result will be unstable when the tube is not full. Because the non-full tube state can be understood as an extreme situation in which a large number of bubbles exist in the measured liquid medium.
There are two situations when the pipe is not filled with liquid. One is that the liquid level is higher than the level of the electrode. The other is lower than the level of the liquid being measured.
When the liquid level in the pipe is higher than the electrode level. If the front and back straight sections of the pipeline are in an ideal state at this time. Generally, the precision data measured by electromagnetic flow is relatively stable. However, because the flow meter liquid contains the gas volume in the pipeline, there is undoubtedly a large measurement error in this measurement state.
When the electrode is higher than the level of the electrode, the electrode is exposed in the air at this time. The measurement circuit is actually in an open state, and the electrode cannot directly contact the liquid. The value and output are in a random state. If the electrode is constantly shaking or full, the electrode will not work normally, and the measurement will not be carried out.
The measurement of the intelligent electromagnetic flowmeter is not only inaccurate, but also damages the electrodes.
However, many sewage pipes are caused by partial pipes. Only when it rains does the tube become full. So what kind of flow measurement method is the most appropriate in such a situation?
At present, the most advanced technology in China is the use of a Doppler ultrasonic flowmeter. Such as rain and sewage pipes. It can accurately monitor the water level, flow rate, flow rate and instantaneous flow rate, cumulative flow rate, water temperature, and other data. It can be refreshed in real-time, and the installation is very simple.
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