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US Patent number 6,240,778 .
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Key Benefits
- Capacitive Liquid Level Sensing Technology
- Microcontroller based
- Harsh Environments
Abstract
A liquid level sensor for detecting when an upper level of a liquid
in a reservoir has reached a predetermined or critical point in the
reservoir. The sensor includes a first input plate and a second input
plate disposed concentrically relative to the first input plate. Each of
the input plates are further of a shape such that an imaginary line
extending through the centroid of the first input plate divides each of
the first and second input plates approximately in half. An output or
receiver plate is positioned closely adjacent the two input plates. The
input plates are further disposed in the reservoir such that the
centroid is at the predetermined or critical level in the reservoir. The
two input plates are alternately electrically excited and the signals
coupled to the output plate are detected and repeatedly compared against
one another. The output signals will differ in magnitude because of the
difference in the dielectric constant of air and the liquid in the
reservoir. As the liquid level in the reservoir approaches the
predetermined or critical point, the output signals coupled onto the
output plate begin approaching one another. When the liquid level
reaches the predetermined or critical point, the output signals are
approximately equal in magnitude. A microcontroller detects this
condition and generates a signal in response thereto. The performance or
accuracy of the sensor is independent of changes in the dielectric
constant of the fluid and, in some cases, is not affected by tilting or
other changes in the orientation of the reservoir which might otherwise
affect the accuracy of measurements taken by other forms of liquid level
sensing devices.
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