© PCE Instruments
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5
Operation
5.1
Principle of measurement
The ultrasonic flow meter has been developed to measure the flow velocity of liquids in pipes. The
non-contact transducers / sensors are placed on the pipes and are thus not subject to any w ear and
tear.
The PCE-TDS 100H/HS w orks w ith tw o signal transducers (sensors) w hich serve as ultrasonic
transmitters and also as ultrasonic receivers. The sensors are installed on the outer w all of the pipe at
a defined distance, one below the other.
The sensors can be installed in Z shape (Z method). In this case, the ultrasound w ill pass through the
pipe once. If the sensors are installed in W shape (W method), the ultrasound w ill pass through the
pipe four times. When using the Z method, the sensors are placed opposite to each other. The sound
passes through the pipe or liquid diagonally. The selection of the right method depends on the
characteristics of the liquid.
1
Dow nstream transducer
2
Flow direction
3
Upstream transducer
4
Spacing
You can find more detailed information on how to place the sensors and how to select the right method
of measurement in chapter 5.3.Sensors.
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