Kenneth H. Morey - Framingham MA Steven C. Dark - Groton MA
Assignee:
Millipore Corporation - Bedford MA
International Classification:
G01N 2702
US Classification:
324439
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.
Fotis Networks
Senior Network Engineer and Network Engineering Team Lead
Naples Fire Protection Inc. Feb 2003 - Nov 2010
Network Administrator and Design Manager and Corporate Officer
Fishingworks.com Nov 1999 - Jun 2002
Cold Fusion Developer
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