Device for measuring the level and/or the temperature in a container
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United States of America Patent
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-
Aug 21, 2007
Grant Date -
Dec 1, 2005
app pub date -
May 16, 2005
filing date -
May 29, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for measuring at least one of a level and a temperature of a liquid in a container includes a resistor arrangement adapted to be immersed in the liquid. An immersed length of the resistor arrangement in the liquid corresponds to the level of the liquid in the container. The resistor arrangement includes upper, middle and lower temperature-dependent elongated resistor elements connected in series or in parallel. Each resistor element has an uniform resistance per unit length along a length thereof. The upper and lower resistor elements are shorter than the middle resistor element. A power source is connectable to the resistor arrangement. Voltage drops across or currents flowing through the resistor elements are measured. A microprocessor is arranged to calculate the immersed length of the resistor arrangement or the temperature of the liquid from predetermined lengths of the resistor elements and from the measured voltages or currents.
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