Operation and Maintenance
UFM Series 6
Q.Sonic-plus
5.3 Transducers
The ultrasonic signals required for the flow measurement are generated and
received by ultrasonic transducers.
Piezoelectric transducers employ crystals or ceramics that are set into
vibration when an alternating voltage is applied to the piezoelectric element.
The vibrating element generates sound waves in the gas. Since the
piezoelectric effect is reversible, the element will become electrically
polarised and produce voltages related to the mechanical strain, when the
crystal is distorted by the action of incident sound waves. Because the
acoustic impedance of the gas is much smaller compared to the acoustic
impedance of the piezoelectric element, and to maximise the acoustic
efficiency, a matching layer is employed between the gas and the
piezoelectric element.
The transducers used in the Ultrasonic Flow Meter Series 6 are type ‘NG’,
see Figure 5-3. Figure 5-4 visualises the NG transducer with the mounting
bracket.
Figure 5-3: NG Transducer
Figure 5-4: NG Transducer
with Mounting Bracket
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