The Pulse Point™ uses a vibrating “tuning fork” to sense the presence of material.
Piezoelectric crystals [A] in the base of the fork create and sense movement of the tines [B]. The electronics [C] and transmit crystal drive the oscillation, and when in air the tines vibrate at about 100 Hz.
When material contacts the fork tip, the oscillation diminishes because the fork is now dampened by material contact.
The receive crystal senses this difference and changes the state of the output relay.
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