Level measurement for storage silos

Details Level measurement for storage silos Level measurement for storage silos

1987-09-16

1989-02-28

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

324 585B, G01F 2328

Patent

active

048074713

ABSTRACT:
An elongated cable has a length equal to the height of the silo, whereby, when the cable is disposed in the silo, it extends from the top end to the bottom end of the silo. An electric generator for generating an AC electric signal is automatically and continuously swept through a preselected frequency range. The generator means being connected to the top end of the cable to thereby transmit the generated signal along the cable. Thus, when the generated signal is transmitted along the cable and the frequency of the generated signal is automatically and continuously swept, peak voltages will occur at frequency intervals, the frequency intervals being a function of the level of material. The frequency intervals are detected whereby to determine the level of material. Interference signals are eliminated by an adjustable impedance device at the bottom end of the cable.

REFERENCES:
patent: 3474337 (1969-10-01), Petrick
patent: 3572119 (1971-03-01), Bak
patent: 3695107 (1972-10-01), Hertz et al.
patent: 4135397 (1979-01-01), Krake
patent: 4307267 (1981-12-01), Peoples
patent: 4495807 (1985-01-01), Field et al.
patent: 4621226 (1984-05-01), Powell
patent: 4649713 (1981-03-01), Bezek

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