The ultrasonic flow meter is a portable device that provides a convenient and non-invasive solution for measuring liquid flow/energy in pipes. Fast to install and simple to set up, handheld/portable ultrasonic flow meters are widely used for online calibration and detection, and measurement of various liquid flows in the industrial field.
Principle
When an ultrasonic beam propagates in a liquid, the flow of the liquid will cause a slight change in propagation time, which is proportional to the flow velocity of the liquid. When there is zero flow, the time required for two sensors to emit and receive sound waves is the same (a technology that can actually measure zero flow). When liquid flows, the sound wave transmission time in the upstream direction is greater than that in the downstream direction. The relationship conforms to the following expression:
Among them, θ is the angle between the sound beam and the direction of liquid flow
M is the number of straight-line propagation times of the sound beam in the liquid
D is the inner diameter of the pipeline
Tup is the propagation time of the sound beam in the positive direction
Tdown is the propagation time of the sound beam in the opposite direction, ΔT=Tup – Tdown
