Level switch

Details Level switch Level switch

1993-01-13

1996-07-02

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

73304R, 73304C, 324662, 340612, G01F 2300, H01H 3500

Patent

active

055325270

ABSTRACT:
A level switch includes an operational amplifier, provided with positive and negative feedback, and a sensor, together forming an astable multivibrator. The oscillation onset and frequency of the multivibrator depend on the surface level of controlled material. The sensor includes a dielectric body on which, starting from its fastening end, a grounded opposite electrode and a screening electrode, connected to the amplifier output, are mounted. A ring plate connected to the inverting amplifier input is incorporated coaxially in the dielectric body. The level switch need not be adjusted when the controlled material is changed, although materials may have quite different electrical properties and may stick to the sensor.

REFERENCES:
patent: 3412220 (1968-11-01), Puppolo et al.
patent: 3956760 (1976-05-01), Edwards
patent: 4188549 (1980-02-01), Dorais
patent: 4214479 (1980-07-01), Maier
patent: 4855706 (1989-08-01), Hauptly
patent: 4952914 (1990-08-01), Mueller
patent: 5046583 (1991-09-01), Sasaki et al.
patent: 5097703 (1992-03-01), Peter
patent: 5275951 (1994-01-01), Chow et al.
patent: 5287086 (1994-02-01), Gibb

Affiliated with

Also associated with

Rating

Level switch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Level switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Level switch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1508729