Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-11-28
1982-03-09
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
73295, G08B 2100, G01F 2300
Patent
active
043192335
ABSTRACT:
This invention generally pertains to a device for electrically detecting a liquid level such as water, oil and so on, which is suitably used for an automatic operating apparatus for a pump, or for a liquid level warning device. The device of the invention comprises an electric heater disposed flush with a liquid level to be detected, a heater temperature detector to electrically detect a heater temperature to generate a heater temperature signal, and an environment temperature detector to electrically detect an environment temperature to generate an environment temperature signal. In one aspect of the invention, there is further provided a reference signal generator to generate a reference signal depending on the range of the environment temperatures at which the liquid level is to be detected, and a comparative circuit to electrically compare a difference between the heater temperature signal and the environment temperature signal to generate a level signal. In another aspect of the invention, there is provided a comparative circuit to electrically compare a ratio of said heater temperature signal to said environment temperature signal with a reference ratio depending on the range of the environment temperatures at which said liquid level is to be detected to generate a level signal.
REFERENCES:
patent: 2861159 (1953-11-01), Seney
patent: 3366942 (1968-01-01), Deane
patent: 3474963 (1969-10-01), Buiting
patent: 3701138 (1972-10-01), Pulliam et al.
Matsuoka Michihiro
Ohba Yasumasa
Caldwell Sr. John W.
Kokusan Denki Co. Ltd.
Myer Daniel
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