Ultrasonic-filling position limit switch operating according to

Details Ultrasonic-filling position limit switch operating according to Ultrasonic-filling position limit switch operating according to

1978-09-20

1980-05-06

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367 98, 367908, 73290V, 340621, G01S 966, G01S 766

Patent

active

042020492

ABSTRACT:
An ultrasonic filling position limit switch having disposed in the container at the full level thereof, at least one ultrasonic transducer for sending out ultrasonic pulses and for receiving echo pulses reflected off the opposite container wall. An amplifier of the electric output signals of the transducer is connected to a threshold limit switch which provides an output signal when the amplifier output signal exceeds a predetermined threshold value. The amplifier output is fed back to an amplifier control input by means of an amplifier control circuit which seeks to maintain the amplifier output signal at an adjustable constant nominal value. A control device blocks the control circuit for the duration of time in each sending period required for the sending out of the ultrasonic sending pulses and for receiving the echo pulses.

REFERENCES:
patent: 2711531 (1955-06-01), Murdock
patent: 3407398 (1968-10-01), Stearn

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