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Introduction
The IFX-P200 is a hand-held, battery operated ultrasonic flowmeter employ-
ing clamp-on sensors for the measurement of liquids in full, enclosed pipes.
Flow measurements can be undertaken without interruption of the process
or interference with the integrity of the pipeline. The clamp-on sensors are
attached to the outside of the pipes. The IFX-P200 uses ultrasonic signals
for measurement of the flow, employing the transit-time method.
Ultrasonic signals are emitted by a transducer installed on a pipe and re-
ceived by a second transducer. These signals are emitted alternately in the
direction of flow and against it. Because the medium is flowing, the transit
time of the sound signals propagating in the direction of flow is shorter than
the transit time of the signal propagating against the direction of flow. The
transit-time difference ΔT is measured and allows the determination of the
average flow velocity along the path of acoustic propagation. A profile cor-
rection is then performed to obtain the average flow velocity over the cross-
sectional area of the pipe, which is proportional to the volumetric flow rate.
Clamp-on
transit-time flowmeter
Illustration 1: Clamp-on ultrasonic sensor configuration
Measuring principle
Illustration 2: Transit-time measuring principle
