Function And System Design; Measuring Principle; System Design Measuring System - Endress+Hauser Proline Prosonic Flow 90U Technical Information

Proline Prosonic Flow 90U, 90W, 91W, 93C, 93U, 93W

Measuring principle

System design
Measuring system
Endress + Hauser

Function and system design

Prosonic Flow operates on the principle of transit time difference.
An acoustic (ultrasonic) signal is sent in both directions from one measuring sensor to another.
A transit time difference arises because the signal propagation velocity of the sound waves is greater in the
direction of flow than against the direction of flow. This difference is directly proportional to the flow velocity.
Prosonic Flow calculates the flow from the pipe cross-sectional area and the measured transit time difference.
v ~ ∆t
Q = v · A
v = Flow velocity
∆t = Transit time difference
v = Volume flow
A = Pipe cross-sectional area
In addition to the volume flow, the system also always measures the sound velocity of the fluid. The sound
velocity can be used to distinguish different fluids or as a measure of fluid quality. Application-specific
configuration of the Prosonic Flow can be carried out locally with the aid of the "Quick Setup" menu.
The Prosonic Flow ultrasonic flow measuring system always consists of a transmitter and the related measuring
sensors. All components are available in different versions depending on the application requirements.
The transmitter is used to actuate the measuring sensors. The electronics and the software in the transmitter
are used to prepare, process and evaluate the sensor signals and to convert the measuring signal to the desired
output variables.
The measuring sensors work bidirectionally as sound transmitters and sound receivers. The electrical signals of
the transmitter are converted to a pressure signal in the measuring sensors and vice versa.
Depending on the design, the different sensor versions of ultrasonic flow measuring devices offer unique
possibilities in the application. The properties and benefits of the different versions are explained in detail on
the following pages.
A0005961
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