settings Industry Applications
|Fill Line Monitoring|
Theory of Operation
The ultrasonic transducer continuously monitors the gap to determine the presence of liquid. When used as a high-level switch, the electronics will immediately actuate a relay or shift a current if it detects a wet gap. When used as a low-level switch, it continuously monitors the gap for a dry condition.
Solutions with Innovation's Ultrasonic Level Switches employ a pair of piezoelectric crystals that are encapsulated within epoxy at the tip of the transducer. The crystals are comprised of a ceramic material that vibrates at a given frequency when subjected to an applied voltage. When the voltage is sent from the electronics, one of the two crystals, the "transmitting crystal" converts the voltage to an ultrasonic signal.
The presence of liquid within the transducer gap allows the second crystal, the "receiving crystal" to sense the ultrasonic signal and converts it back into an electronic signal. The signal informs the electronics that liquid is present within the transducer gap. If no liquid is present, the ultrasonic signal is attenuated and cannot be detected by the receiving crystal.