Continuous condition sensing system determining liquid level by

Details Continuous condition sensing system determining liquid level by Continuous condition sensing system determining liquid level by

1990-03-19

1991-09-03

Strecker, Gerard R.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324611, 324671, 324679, G01R 2726

Patent

active

050457977

ABSTRACT:
A probe developing an admittance with a material whose condition is to be continuously measured is capacitively coupled with a variable frequency oscillator, preferably one having a digital output stage, for generating a variable frequency signal having a period varying with the admittance developed at the probe. Both the oscillator input and output are capacitively coupled to the probe. In a preferred embodiment, a set point circuit including a plurality of resistors coupled in parallel with the oscillator output and a plurality of switches coupled in parallel with the probe conductor and each with a different one of the resistor, provides easy circuit adjustment for use of the system with a variety of materials. A preferred digital circuit employing a pair of flip flops, fixed timer and one shot generate a fixed period variable duration duty cycle digital voltage level signal for transmission, if desired, or for conversion into a variable current signal.

REFERENCES:
patent: 2866336 (1958-12-01), Hitchcox
patent: 3706980 (1972-12-01), Maltby
patent: 3781672 (1973-12-01), Maltby et al.
patent: 3860882 (1975-01-01), Maltby et al.
patent: 3879644 (1975-04-01), Maltby et al.
patent: 4146834 (1979-03-01), Maltby et al.
patent: 4166388 (1979-09-01), Sun et al.
patent: 4347740 (1982-09-01), Townsend
patent: 4515015 (1985-05-01), Kuhlman
patent: 4589281 (1986-05-01), Aldrich
patent: 4642555 (1987-02-01), Swartz et al.
patent: 4674329 (1987-06-01), Mulder

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