Stabilized conductivity sensing system
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United States of America Patent
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-
Jan 27, 2004
Grant Date -
Sep 4, 2003
app pub date -
Mar 1, 2002
filing date -
Mar 1, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stabilized fluid conductivity measurement system includes a threaded metal housing with an inner portion having two probes for contacting the fluid to be measured and having an outer portion in which electrical circuitry is mounted. The circuitry includes a balanced square wave generator providing excitation to a modified Wheatstone bridge, including first and second input excitation terminals, and first and second output terminals. Fixed resistances may be located in 3 arms of the Wheatstone bridge, and the fourth arm may have two resistances with an intermediate tap; and one of the two probes is connected to this tap while the other probe is connected to one of the input excitation points.
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