Title: Humidity sensor alarm unit

Abstract: An alarm unit for a humidity sensor activates an alarm circuit when the relative humidity rises above a certain value or under certain malfunction conditions such as a missing sensor or a cut cable, includes a first circuit for establishing a reference signal, and a second circuit adapted to be connected to a humidity sensor for responding thereto and for generating a humidity out-of-limits signal. A third circuit responds to the reference signal and to the humidity out-of-limits signal to generate an alarm signal. The third circuit includes a level detector, and the first circuit comprises an impedance device which cooperates with the second circuit which in turn connects the sensor to the input of the level detector, the sensor being a variable impedance device.

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Other info:

Inventors: Warner, Roger M. (Bethesda, MD, US)

Application Number: 724811
Filing Date: 1976-09-20
Publication_date: 1978-05-30
Assignee: Baxter Travenol Laboratories, Inc. (Deerfield, IL)
Primary Class(es): 340/507 340/602
Other Classes:
US Patent Ref:

2752586	Jun, 1956	Jordan	340/235.
2832947	Apr, 1958	Patchell	340/409.
3197699	Jul, 1965	Johansen	340/235.
3588891	Jun, 1971	Porter	340/409.
3599862	Aug, 1971	Hogan	340/235.
3771548	Nov, 1973	Rauchwerger	340/235.
3898423	Aug, 1975	Taylor	340/235.
3902040	Aug, 1975	Ikeda	340/235.
3950740	Apr, 1976	Greene	340/235.
4035787	Jul, 1977	Hornung	340/409.

Other Refs:
Primary Examiner: Habecker, Thomas B.
Assistant Examiner:
Attorney: Collins; H. W., Kinney; Richard G., Cummings; Eugene M.