Manual

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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 wear and

tear.

The PCE-TDS 100H/HS works with two signal transducers (sensors) which serve as ultrasonic

transmitters and also as ultrasonic receivers. The sensors are installed on the outer wall 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 will pass through the

pipe once. If the sensors are installed in W shape (W method), the ultrasound will 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 Downstream 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.