KATflow 150
2
Introduction
2
Introduction
The KATflow 150 is an ultrasonic flowmeter employing clamp-on sensors for the
measurement of liquids in full, enclosed pipes. Flow measurements can be under-
taken 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 KAT-
flow 150 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 received 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 meas-
ured and allows the determination of the average flow velocity along the path of
acoustic propagation. A profile correction 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.
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Illustration 1: Clamp-on ultrasonic flowmeter configuration
Measuring principle
Illustration 2: Transit-time measuring principle
Clamp-on trans-
it-time flowmeter
