Device for indicating hydroculture-related values

Details Device for indicating hydroculture-related values Device for indicating hydroculture-related values

1987-11-16

1989-10-31

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340596, 340602, 340604, 340620, 324 61P, 324 65P, 200190, G08B 1900, G08B 2100

Patent

active

048780430

ABSTRACT:
A device for indicating values which are of interest in hydroculture applications is characterized in that the device includes a tube open at one end thereof and attached to a vessel at another end thereof. A probe including a sensor is disposed proximate the one end of the tube for responding to liquid. An IC connected to the sensor includes an electronic system 12 and an optical or acoustic signal transmitter (15) is connected to the electronic system galvanically or in a wireless manner. This arrangement makes it possible to reliably indicate any absence of liquid and to read the indication with ease.

REFERENCES:
patent: 3882383 (1975-05-01), Matlin
patent: 3927370 (1975-12-01), De Bough
patent: 4020417 (1977-04-01), Brehob et al.
patent: 4122389 (1978-10-01), Haagen
patent: 4268824 (1981-05-01), Phillips
patent: 4319485 (1982-03-01), Terada et al.
patent: 4514722 (1985-04-01), Batcheler et al.

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