Patent
1975-05-12
1976-06-01
Goldberg, Gerald
317157, H01H 4700
Patent
active
039612309
ABSTRACT:
A high level probe and a low level probe are mounted at corresponding locations within a container of dry granular or powdered material. The probes are selectively coupled via an input relay to the signal input of a multi-stage amplifier. An output relay is coupled in series with the D.C. power supply for the amplifier and is actuated when the amplifier's total current drain reaches a predetermined value, which occurs when the dry material contacts the high level probe and increases the capacitance thereof. The output relay is coupled to the input relay via a transfer relay to switch the input from the high level probe to the low level probe when the output relay is actuated. The output relay remains actuated until the material level drops below the low level probe, at which time the output relay de-actuates, which switches the high level probe back to the amplifier input, and activates means for refilling the container with dry material. When the material reaches the high level probe again, the output relay actuates, which switches the refilling means off, and switches the low level probe to the amplifier input. The transfer relay switches between two calibrating rheostats, one of which is used to calibrate the output relay when the high level probe is connected in the circuit, and the other of which is used to calibrate the output relay when the low level probe is connected in the circuit. A third calibrating rheostat is coupled in series with the first mentioned rheostats to compensate for the distributed capacitance of the cables coupled to the two probes.
REFERENCES:
patent: 3300690 (1967-01-01), Taraba
patent: 3465208 (1969-09-01), Patrickson et al.
Goldberg Gerald
Hartley Controls Corporation
House, Jr. Joseph P.
LandOfFree
Current relay actuated by multistage amplifier's total current d does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Current relay actuated by multistage amplifier's total current d, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current relay actuated by multistage amplifier's total current d will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2404456