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 The
basic principle behind Ultrasonic Contact Technology is that high-frequency
sound waves are easily transmitted across a transducer gap in
the presence of a liquid medium, but are severely attenuated when
the gap is dry. The transducer uses a pair of piezoelectric crystals
at the tip of the transducer. The transmit crystal converts an
electrical signal into an ultrasonic signal. When liquid is present
in the gap, the receive crystal is able to sense the ultrasonic
signal from the transmit crystal and convert it back to an electrical
signal. This signal is sent to the electronics to indicate the
presence of liquid in the transducer gap. When there is no liquid
present, the ultrasonic signal is attenuated, and the receive
crystal is not able to sense the sound waves from the transmit
crystal.
Ultrasonic Contact Technology
Advantages:
- Low
Cost
- Independent
of viscosity, density or conductivity
Ultrasonic Contact Technology
Disadvantages:
- Non-coating
liquids only
- Insulating
coatings can cause problems
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