Ultrasonic level instrument with dual frequency operation
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United States of America Patent
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Sep 26, 1995
Grant Date -
N/A
app pub date -
Dec 9, 1993
filing date -
Dec 9, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasonic level instrument detects the presence of a fluid at a defined location and provides a self-diagnostic integrity check. An excitation circuit simultaneously induces vibrations at a first and second frequency in a transmitting piezoelectric crystal, and the vibrations are detected by a receiving crystal. A first and second filter circuit generate first and second filter outputs, respectively, by selectively passing the receiving crystal output at the first and second frequencies, respectively. The first filter output is indicative of the presence of fluid and the second filter output is indicative of the sensor integrity.
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