Measuring and testing – Liquid level or depth gauge
Patent
1985-12-20
1987-02-24
Frankfort, Charles
Measuring and testing
Liquid level or depth gauge
73290R, 310319, 310321, G01F 2300, H01L 4108
Patent
active
046447890
ABSTRACT:
A liquid level indicator system is provided for sensing the presence of liquid at a preselected level in a liquid containing container. A piezoelectric reed transducer is disposed in the container for detecting vibrational movement and for producing an electrical signal in response to the vibrational movement. Operationally coupled to the transducer is a paddle which is sized to be immersed in the liquid when the liquid is present at the proper level. Immersion of the paddle in the liquid inhibits the transducer from vibrating due to fluid resistance against the paddle and accordingly inhibits an electrical signal output from the transducer. A control circuit is provided for sensing the electrical signal generation and for generating an alarm signal representative of low liquid level. A tubular housing is provided for containing a level of liquid representative of liquid level in the liquid container. The reed is preferably tuned to a preselected natural frequency sympathetic to ambient system vibrations. Where the indicator system is desired to be used in an environment containing no ambient vibrations, an oscillator driver is provided for communicating a driving frequency to the reed for vibrating the reed at its natural frequency.
REFERENCES:
patent: 3206979 (1965-09-01), Banks
patent: 3834233 (1974-09-01), Willis et al.
patent: 4144517 (1979-03-01), Baumoel
patent: 4307602 (1981-09-01), Sawada et al.
Kevin Smith, "Vibrating Transducer Has Digital Output", Electronics, vol. 53, No. 16, Jul. 1980.
Baumann Russell E.
Clevite Industries Inc.
Frankfort Charles
Worth W. Morris
LandOfFree
Liquid level indicator system 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 indicator system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid level indicator system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-102093