Resistive controller

Details Resistive controller Resistive controller

1979-04-30

1981-11-03

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361198, 239DIG15, H01H 4732

Patent

active

042989019

ABSTRACT:
A resistive controller suitable for sensing a variable electrical resistance indicative of a characteristic of a substance and for connecting an external electrical device to a source of electrical power when the measured electrical resistance reaches a predetermined level. The resistive controller includes a timer circuit which is activated when the measured electrical resistance reaches the predetermined value and which, in one embodiment, provides an adjustable time period, upon the expiration of which, the external electrical device is disconnected from the source of electrical power. In another embodiment, the timer circuit provides an adjustable time period, upon the expiration of which, the external electrical device is connected to the source of electrical power.

REFERENCES:
patent: 2578981 (1951-12-01), Parker
patent: 2611643 (1952-09-01), Higgins
patent: 2695976 (1954-11-01), Hasenkamp
patent: 2721101 (1955-10-01), Richard, Jr.
patent: 2737615 (1956-03-01), Roby et al.
patent: 2943245 (1960-06-01), Ohlheiser
patent: 3195816 (1965-07-01), Mercer
patent: 3197699 (1965-07-01), Johansen
patent: 3224676 (1965-12-01), Rauchwerger
patent: 3590335 (1971-06-01), Tetar

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