Conductivity monitoring system
First Claim
1. A conductivity monitoring system for continuously monitoring the conductivity of a fluid flowing into and through a housing comprising:
- a. indicator meansb. at least a common, a first and a second electrode disposed within said housing in contact with said fluid, said common electrode being positioned closer to said first electrode than to said second electrode, whereby the electrical conductivity between said common electrode and said first electrode will be different than the electrical conductivity between said common electrode and said second electrode;
c. means connected to said electrodes to approximate a constant current source for energizing said electrodes to provide substantially the same current flow through them.d. means for detecting the difference in the conductivity between said common and first electrodes and between said common and second electrodes and providing a difference voltage output signal representing the value of the conductivity of said fluid; and
e. means for coupling said signal to said indicator means to operate said indicator means.
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Accused Products
Abstract
A conductivity monitoring system which includes at least three electrodes disposed within a housing of a conductivity cell, into and through which a fluid to be monitored is caused to flow. One of the electrodes is a common electrode and is positioned closer to one of the other two electrodes. The conductivity is measured between the wide spaced pair of electrodes and between the closer spaced pair of electrodes, with the difference being taken as the actual conductivity. With this arrangement, changes in the conductivity as a result of foreign matter collecting on the electrodes and the housing over a period of time are compensated for, since the difference in the conductivity between the two pairs of electrodes remain the same, even though the conductivity between each respective pair may change.
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Citations
15 Claims
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1. A conductivity monitoring system for continuously monitoring the conductivity of a fluid flowing into and through a housing comprising:
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a. indicator means b. at least a common, a first and a second electrode disposed within said housing in contact with said fluid, said common electrode being positioned closer to said first electrode than to said second electrode, whereby the electrical conductivity between said common electrode and said first electrode will be different than the electrical conductivity between said common electrode and said second electrode; c. means connected to said electrodes to approximate a constant current source for energizing said electrodes to provide substantially the same current flow through them. d. means for detecting the difference in the conductivity between said common and first electrodes and between said common and second electrodes and providing a difference voltage output signal representing the value of the conductivity of said fluid; and e. means for coupling said signal to said indicator means to operate said indicator means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A conductivity monitoring system for monitoring the conductivity of a fluid flowing into and through a housing comprising:
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a. indicator means; b. at least a common, a first and a second electrode disposed within said housing in contact with said fluid, said common electrode being positioned closer to said first electrode than said second electrode; c. a first and a second resistance means connected in series with said first and second electrodes, respectively; d. a first transformer having a primary and a secondary winding, said common electrode being coupled to one terminal of said secondary winding and said first and second electrodes being coupled to the other terminal thereof; e. a second transformer having a primary and a secondary winding, said primary winding being connected across said first and second resistance means to thereby detect the difference in conductivity between said common and first electrodes and said common and second electrodes and to provide at the output of said secondary winding a difference voltage signal representing the value of the conductivity of said fluid; f. oscillator means coupled to said primary winding of said first transformer means for energizing said electrodes; and g. means coupled to said secondary winding of said second transformer means and responsive to said difference voltage signal for providing a signal proportional to the value of the conductivity of said fluid to said indicator means to thereby operate the latter to provide an indication of the value of the conductivity of said fluid. - View Dependent Claims (13, 14, 15)
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Specification