Level measuring apparatus

Details Level measuring apparatus Level measuring apparatus

1978-06-16

1979-04-17

Ciarlante, Anthony V.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73 1H, 340612, G01F 2326

Patent

active

041494121

ABSTRACT:
An apparatus for measuring the level of material in a container includes a timer which responds to the change in the capacitance of a probe as the level of the material varies with respect thereto. An oscillator periodically strobes said timer, which thereafter remains on for a length of time determined by said probe capacitance. A meter indicates this timer on-time, thereby providing a measure of the detected probe capaictance, and thus the level of material. The on-time of said oscillator is also variable, the output thereof being coupled to said meter to hold said meter off for a time equal to the time said timer is caused to be on due to the residual capacitance of the probe existing even when no material is present. One or more flag timers are also provided, including the ability to adjust the on-time of each said flag timer to provide an indication of a critical level or of a level above or below such level.

REFERENCES:
patent: RE27829 (1973-12-01), Tiffany
patent: 3533286 (1970-10-01), Westcott et al.
patent: 3916689 (1975-11-01), Donnelly
patent: 4058765 (1977-11-01), Richardson et al.

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