Basic Instrumentation for Measuring or Working principle of Ultrasonic flow meter - Instrumentation Training

 Basic Instrumentation for Measuring or Working principle of Ultrasonic flow meter - Instrumentation Training 

Below is the video regarding basic Instrumentation of working principle of Variable area flow meter, and in Todays video  I want to tell about the measuring or working principle of Ultrasonic flow meter.

Do you know how this ultrasonic flow meter works?
The ultrasonic flowmeter utilizes the propagation time of the ultrasonic signal in the fluid.
A pair of transducers are installed on the outer surface of the pipe. Each transducer works alternatively as both transmitter and receiver of ultrasonic signals.
When the ultrasonic signal is transmitted toward the upstream side against the flow direction, more
propagation time is required (T1). On the other hand, when it is transmitted toward the downstream side with the flow direction, the propagation time is less (T2). That is, the signal is delayed or speeded up by the moving fluid. The difference in time between "T1" and "T2" is proportional to the flow velocity, and the flow volume can be calculated by multiplying it by the cross-sectional area, which is obtained by using the pipe diameter and wall thickness.

This kind of measurement offers following advantages,
first one is Measurement independent of pressure, density, temperature, conductivity and viscosity (for homogeneous fluids).
Second one is Free pipe cross-section, no pressure loss.
third one is No moving parts, minimum maintenance and upkeep.
fourth one is  Long service life, no abrasion or corrosion from the fluid.
fifth one is lnline or clamp-on design for stationary or temporary flow measurements.

this is the measuring or working principle of ultrasonic flow meter

Basic Instrumentation for Measuring or Working principle of Ultrasonic flow meter - Instrumentation Training