Portable conductivity meter for artificial kidney machines

Details Portable conductivity meter for artificial kidney machines Portable conductivity meter for artificial kidney machines

1974-11-08

1976-09-14

Stern, Ronald J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

204271, 324 30B, G01N 2730

Patent

active

039809447

ABSTRACT:
An improved portable conductivity meter for automatically and rapidly drawing an electrolyte sample and for measuring and providing an accurate output indication of its electrical conductivity, which is independent of temperature variations of the electrolyte. A pen-like dip probe, housing an electrode pair and a thermistor in unique configuration, is designed to rapidly draw an electrolytic dialysate sample whenever the probe is immersed within the electrolyte. A high frequency AC source drives a balanced active measurement circuit, having a reference leg and a measurement leg which contains the electrode pair and the temperature compensating thermistor. The balanced circuit provides measurement and reference output signals of opposite polarity to a summing amplifier which drives a visual conductivity indicator.

REFERENCES:
patent: 3029379 (1962-04-01), Ingram
patent: 3412325 (1968-11-01), Soderling
patent: 3549989 (1970-12-01), Brown
patent: 3748899 (1973-07-01), Gregg et al.
patent: 3870952 (1975-03-01), Sibley

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