Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1980-10-21
1983-05-10
Tokar, Michael J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324442, 324441, 324446, G01N 2702
Patent
active
043832210
ABSTRACT:
A compact, battery-powered water resistivity sensor measures the resistivity of water, sequentially compares the measured resistivity to a plurality of predetermined resistivities, and numerically displays that one of the plurality of predetermined resistivities approximating the measured resistivity. Preferably, the pair of electrodes consists of a pair of printed circuit electrodes disposed conveniently on the end face of an insulating nut extending, in fluid-tight fashion, into the tank of water. The sensor is powered by a battery, and includes circuitry for interrupting the supply of battery power to various circuit elements, the functions of which elements are no longer needed once the water resistivity is determined by the sensor. The sensor also includes temperature-sensitive compensation means responsive to changes in the water temperature for varying an input signal provided to the electrodes. Finally, the sensor includes a low battery condition detection means responsive to the low battery condition for displaying a corresponding low battery indicator.
REFERENCES:
patent: 3000805 (1961-09-01), Carritt
patent: 3334745 (1966-03-01), Burgess et al.
patent: 3710237 (1973-01-01), Watson
patent: 3919627 (1975-11-01), Allen
patent: 4035719 (1977-07-01), Anderson
patent: 4082666 (1978-04-01), Jones et al.
Series MG-MHO GUN; "A New and Better Idea in Portable Conductivity Measurement"; Beckman.
"Conductivity Ratio Solu Meter Series SM-RA"; Beckman.
Product Specification PSS 6-3A1A Series 910M, 915M, 915N, and 915H Balsbaugh Conductivity Monitors; Foxboro.
Dark Steven C.
Morey Kenneth H.
Cook Paul J.
Millipore Corporation
Prashker David
Tokar Michael J.
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