Other commonly used types of flow meters

ultrasonic
Ultrasonic flowmeter is an instrument that measures flow rate by detecting the effect of fluid flow on an ultrasonic beam (or ultrasonic pulse). [5]
According to the principle of signal detection, ultrasonic flow meters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method, and frequency difference method), beam offset method, Doppler method, cross-correlation method, spatial filtering method, and noise method.
Ultrasonic flow meters, like electromagnetic flow meters, belong to the category of unobstructed flow meters due to the absence of any obstacles in the instrument flow channel. They are suitable for solving the problem of difficult flow measurement, especially in large-diameter flow measurement, and have outstanding advantages. They are one of the rapidly developing types of flow meters.
Advantages:
(1) Can perform non-contact measurements; (2) For measurement without flow obstruction and without pressure loss;
(3) It can measure non-conductive liquids and is a supplement to electromagnetic flow meters for unobstructed measurements.
Disadvantages:
(1) The propagation time method can only be used for cleaning liquids and gases; The Doppler method can only be used to measure liquids containing a certain amount of suspended particles and bubbles; (2) The Doppler method has low measurement accuracy.
Application Overview:
(1) The propagation time method is applied to clean, single-phase liquids and gases. Typical applications include factory discharge liquids, strange liquids, liquefied natural gas, etc;
(2) We have good experience in gas applications in the field of high-pressure natural gas;
(3) Doppler method is suitable for biphasic fluids with low heterogeneous content, such as untreated wastewater, factory discharge liquid, and dirty process liquid; Usually not suitable for very clean liquids.