KATflow 100
2 Introduction
2 Introduction
The KATflow 100 is an ultrasonic flow transmitter employing 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
KATflow 100 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
measured 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 sensor configuration
Measuring principle
Illustration 2: Transit-time measuring principle
Clamp-on transit-
time flow transmitter
