Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1975-01-22
1976-02-17
Hohauser, Herman J.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
73304C, 137392, 317246, H01H 3518
Patent
active
039393607
ABSTRACT:
A system for detecting the fluid level in an intravenous bottle wherein a disposable electrode assembly, consisting of a piece of tape having upper, middle and lower electrode strips, is adhered to the bottle and connected to sensing equipment. The upper strip is longer than the middle strip and the middle strip is longer than the lower strip, so that the capacity between the upper and middle strips (C.sub.1) is normally greater than that between the middle and lower strips (C.sub.2). The sensing equipment includes a bias capacity (C.sub.3) connected between the middle and lower strips so that C.sub.1 is less than C.sub.2 plus C.sub.3 except when the tape is on a bottle with the fluid level in the bottle above the top strip. Pulses having a gradually sloped leading edge and a steep trailing edge are fed to the centre strip. The received pulses at the top and bottom strips are differentiated and fed to the inputs of a differential amplifier which produces an output which changes in polarity when the fluid drops below the upper electrode strip. A delay circuit generates an alarm signal after the changed polarity output signal has persisted for a predetermined interval. If the tape falls off the bottle or becomes disconnected from the sensing equipment, the alarm signal will be produced.
REFERENCES:
patent: 3073160 (1963-01-01), Shanhan
Marsh, J. Kendall, "Two Frequency-Liquid-" from Electronics p. 90, Mar. 20, 1967.
Bangay Albert
Hohauser Herman J.
Jackson John A.
LandOfFree
Liquid level sensor and electrode assembly therefor 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 sensor and electrode assembly therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid level sensor and electrode assembly therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1747733