Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1992-07-28
1993-08-24
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 32, 417 36, F04D 2700
Patent
active
052383695
ABSTRACT:
The present invention is a liquid level control system for selectively activating and deactivating a pump according to the liquid level indicated by capacitive sensors. Activating circuitry starts the pump motor when both upper and lower sensors indicate the presence of liquid. The pump motor is latched on by the activating circuitry and continues operation until the lower capacitive sensor indicates the absence of liquid, in which case the pump is shut off. A high frequency oscillator operates reliably over a wide range of operating conditions to maintain relatively constant charging time for the capacitive sensors.
REFERENCES:
patent: 2409073 (1946-10-01), Sias
patent: 2529015 (1950-11-01), Goudime
patent: 2570218 (1951-10-01), Draganjac
patent: 2852937 (1958-09-01), Maze
patent: 2863472 (1958-12-01), Vacoles
patent: 3073160 (1963-01-01), Shawhan
patent: 3282468 (1966-11-01), Karlen
patent: 3375716 (1968-04-01), Hersch
patent: 3391547 (1968-07-01), Kingston
patent: 3472168 (1969-10-01), Inoue
patent: 3544236 (1970-12-01), Brookmire
patent: 3588859 (1971-06-01), Petree
patent: 3800205 (1974-03-01), Zalar
patent: 4171186 (1979-10-01), Chapman
patent: 4171932 (1979-10-01), Miller
patent: 4244385 (1981-01-01), Hotine
patent: 4245188 (1981-01-01), Rottmar
patent: 4580403 (1986-04-01), Hummel
patent: 4600844 (1986-07-01), Atkins
patent: 4780705 (1988-10-01), Beane
patent: 4881873 (1989-11-01), Smith et al.
patent: 5145323 (1992-09-01), Farr
Bertsch Richard A.
Scheuermann David W.
Tecumseh Products Company
LandOfFree
Liquid level control with capacitive sensors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid level control with capacitive sensors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid level control with capacitive sensors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-825304