Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-08-10
1999-05-11
Tong, Nina
Communications: electrical
Condition responsive indicating system
Specific condition
340611, 340614, 340626, G08B23/00
Patent
active
059032189
ABSTRACT:
A wave motion detector system for a swimming pool includes a transducer responsive to positive and negative pressure changes in swimming pool water and operative to generate corresponding electrical signals. Comparators are responsive to the electrical signals, and operative to generate a crest signal while the positive pressure exceeds a predetermined positive threshold level, and a trough signal while the negative pressure exceeds a predetermined negative threshold level. A band pass filter prevents electrical signals having a frequency greater than a predetermined upper frequency, and lower than a predetermined lower frequency from passing from the transducer to the comparators. A pulse width discriminator is responsive to the crest signal and the trough signal and is operative to generate a qualified crest signal if the crest signal remains active for a first predetermined time interval, and a qualified trough signal if the trough signal remains active for a second predetermined time interval. A counter circuit, responsive to the qualified crest signal and the qualified trough signal, determines a count value which is equal to the number of times the qualified trough signal and the qualified crest signal occur during a counting time interval. A processing circuit includes alarm condition detection circuitry responsive to the count value, and operative to generate an alarm signal if the count value is greater than or equal to a predetermined alarm count value. Annunciator means, responsive to the alarm signal, is operative to indicate an alarm condition if the alarm signal is generated.
REFERENCES:
patent: 3760396 (1973-09-01), Haselton
patent: 5121104 (1992-06-01), Nelson et al.
patent: 5268673 (1993-12-01), Nelson et al.
patent: 5325086 (1994-06-01), Thomas
Boyce Justin
Donnelly Oppenheimer W.
Hamrick Claude A.S.
Tong Nina
Vigilant Systems, Inc.
LandOfFree
Pool alarm does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pool alarm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pool alarm will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-248235