Measuring and testing – Liquid level or depth gauge – Float
Patent
1976-11-19
1978-07-25
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Float
73304R, 73308, 340625, G01F 2306, G01F 2310
Patent
active
041021916
ABSTRACT:
A digital readout fuel gauge for monitoring the liquid level in a fuel storage tank. The device utilizes a pre-amplifier circuit which comprises a voltage divider network utilizing the fuel gauge tank variable resistor on one side of the divider and a variable resistance on the other side which is connected to a signal processor. The output voltage of the signal processor is connected to the analog input of an analog to digital converter. The analog to digital converter changes the DC voltage levels to a four bit BCD code. The output carrying the code is connected to a decimal digit to a seven segment LED decoder. The digits are generated and displayed on LED indicator units. In addition, a voltage comparator circuit compares the output of the signal processor with a reference voltage and when said output is below a predetermined level, the comparator circuit initiates a warning signal.
REFERENCES:
patent: 3376568 (1968-04-01), Stewart et al.
patent: 3623043 (1971-11-01), Bozoian
patent: 3681707 (1972-08-01), Bean
patent: 3830090 (1974-08-01), Hersch et al.
patent: 3855585 (1974-12-01), Stout
patent: 3911373 (1975-10-01), Ohtake et al.
patent: 3940679 (1976-02-01), Brandwein et al.
Crutsinger Gerald G.
Dwight Larry B.
Gorenstein Charles
Queisser Richard C.
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