Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1978-06-02
1981-02-24
Tokar, Michael J.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
331 65, 324 65CR, G01N 2742
Patent
active
042530644
ABSTRACT:
A system for determining the presence or absence of coolant liquid as well as for monitoring the effectiveness of corrosion inhibition of the liquid includes a high impedance differential amplifier to which two electrodes, adapted to be immersed in the liquid, are connected. The high impedance differential amplifier measures the d.c. potential of the electrodes as an indication of the effectiveness of the corrosion inhibition characteristic of the liquid. The output of the amplifier is connected to a detector which in turn is connected to conventional indication means such as a light emitting diode. A conventional power source provides positive and negative power to the amplifier. The output of the amplifier is also connected to one of its two inputs through a feedback network comprising a capacitor and a resistance which includes the resistance between the electrodes. An electrically insulative barrier may be interposed between the electrodes or one of the electrodes may be grounded through a relatively large capacitor. The amplifier-feedback network can be used to determine the presence or absence of liquid independently of the corrosion monitoring function if desired.
REFERENCES:
patent: 3254333 (1966-05-01), Baumoel
patent: 3340866 (1967-09-01), Noller
patent: 3805184 (1974-04-01), Visioli
patent: 3906353 (1975-09-01), Murdock
patent: 4101828 (1978-07-01), Dehler
Haug John A.
McAndrews James P.
Sharp Melvin
Texas Instruments Incorporated
Tokar Michael J.
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