Method of setting the switching point of a capacitive level limi

Details Method of setting the switching point of a capacitive level limi Method of setting the switching point of a capacitive level limi

1996-09-26

1998-05-26

Karlsen, Ernest F.

Measuring and testing

Instrument proving or calibrating

Liquid level or volume measuring apparatus

73 134, 324601, G01D 1800, G01F 2500

Patent

active

057568766

ABSTRACT:
The capacitive level limit switch used for monitoring the level of a material in a container has a capacitive probe fitted at the height of the level to be monitored so that it is covered by the material when the level has attained this height. The capacitance of the probe is compared to a threshold value determining the switching point, for establishing whether the probe is covered by material or not. For setting the switching point, the capacitance of the probe measured in one condition of the probe is stored as a first reference value and a provisional second reference value is calculated from the first reference value by addition or subtraction of a predetermined amount and is also stored. From the stored reference values the threshold value is calculated according to a prescribed function so that it lies between the two reference values. If it is determined in operation that the measured capacitance value deviates by a certain amount from the second reference value, this measured capacitance value is stored as a new second reference value, and from the reference values now stored a new threshold value is calculated according to the prescribed function.

REFERENCES:
patent: 3212318 (1965-10-01), Lomax
patent: 4383444 (1983-05-01), Beaman
patent: 4499767 (1985-02-01), Fathauer
patent: 5553479 (1996-09-01), Rauchwerger

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