Reference selection for liquid flow meters
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When selecting a flow meter for measuring liquids, the following factors should be taken into account: the pressure loss should be as low as possible; since the flow velocity is not high, dirt and sediment tend to accumulate on the inner walls of the pipes, so the flow meter used must have a particularly wide measurement range to accommodate the significant variations in flow rates over different periods of time. Below, we recommend several types of flow meters suitable for measuring liquid flow for your selection. 1. VNLW turbine flowmeters – they are relatively inexpensive, but they are only suitable for measuring clean liquids; otherwise, it is very likely that the turbine will get stuck (it is not practical to install filters with an appropriate mesh size in large-diameter pipes). 2. VNLUGB vortex flow meter – It has better dirt resistance than turbine flow meters, and its measurement accuracy is also good; however, the lower limit for the flow velocity it can measure cannot be too low (when measuring water flow, the lower limit is only 0.3 m/s), otherwise it will not be suitable for use. 3. VNCY ultrasonic flow meter – not affected by changes in temperature, pressure, density, or conductivity; it features a simple sensor design, has no throttling elements, and does not get clogged; installation can be carried out without shutting down the operation or cutting off power. 4. VNLD electromagnetic flowmeter – low cost, no moving parts; the parts in contact with the medium are made of stainless steel, ensuring a long service life. It is easy to install and requires no maintenance. One model of this flow sensor can be used for various pipe diameters, which facilitates selection and use. The above is reference information for selecting flowmeters suitable for measuring liquid flow. You can choose the appropriate flowmeter based on the actual operating conditions at the site. If you have any additional suggestions, feel free to leave a comment for discussion.
There are also those based on differential pressure, those with metal rotors, mass flow meters, and so on – there are countless types of them. The subject involves a great deal of complexity, and it’s really impossible to explain it in just a few words; one has to consider the specific requirements of each situation.
The original poster only talked about the advantages and didn’t mention the disadvantages or limitations of various flowmeters; I hope this can be added
Turbines are prone to getting stuck; vortex flow meters are susceptible to vibration interference; there must be no bubbles or particles inside the ultrasonic tube, and certain installation conditions must also be met; electromagnetic devices lack cost advantages and their installation is complicated.