Showing papers on "Condition monitoring published in 1971"
Patent•
26 Apr 1971
TL;DR: A condition monitoring apparatus for use by homeowners, small business operators and the like to provide a warning of unauthorized entry, fire, flooding, or other condition change is described in this article.
Abstract: A condition monitoring apparatus for use by homeowners, small business operators and the like to provide a warning of unauthorized entry, fire, flooding, or other condition change. A variety of detection, sensor, and monitoring devices can be attached to the apparatus as inputs, including both parallel and series connected switches and independent monitoring systems. Certain of the input circuits incorporate a time delay device to delay response to the apparatus to an input condition change. On actuation of the apparatus, a latching relay provides power to a pair of control relays. One control relay remains energized until the latching relay is reset, while the other control relay becomes de-energized after a predetermined time interval. Energization of the control relays is adapted to apply power to various lighting, alarm and indicator devices attached to the apparatus as outputs. The apparatus permits selection of any of a variety of input and output devices to suit the apparatus to the needs of a particular user, with optional on-off control of certain input and output circuits.
5 citations