Singular housing window or door intrusion detector using earth magnetic field sensor
AssigneePittway Corporation
InventorKenneth L. Addy
Life of this patent
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Abstract
The present invention is a method, an apparatus, and a system for detecting a change in position of a door or a window in an alarm system. The present invention is a singular housing with a magnetometer for monitoring the magnetic field of the earth, and a microprocessor for detecting a change in the position of the singular housing with respect to the magnetic field of the earth. The microprocessor generates an alarm signal upon detecting the change, and causes the alarm signal to be transmitted, by wireless transmission, to a remote receiving station.
Claims19
A method of detecting a change in position of an entrance closure in an alarm system comprising the steps of:
- a) attaching a singular housing on the entrance closure that is being monitored;
- b) monitoring, with apparatus in the housing, the magnetic field of the earth;
- c) detecting, with apparatus in the housing, a change in the position of the housing with respect to the magnetic field of the earth;
- d) generating an alarm signal upon detecting a change in position of the housing with respect to the magnetic field of the earth that exceeds a first predetermined threshold;
- e) transmitting by wireless transmission the alarm signal to a remote receiving station;
- and
- f) generating a trouble signal upon detecting a change in position of the housing with respect to the magnetic field of the earth that exceeds a second predetermined threshold.
An apparatus for detecting a change in position of an entrance closure in an alarm system comprising:
- a singular housing attached to an entrance closure being monitored;
- the housing comprising:
- a) means for monitoring the magnetic field of the earth;
- b) means for detecting a change in the position of the housing with respect to the magnetic field of the earth;
- c) means for generating an alarm signal upon detecting a change in position of the housing with respect to the magnetic field of the earth that exceeds a first predetermined threshold;
- d) means for transmitting by wireless transmission the alarm signal to a remote receiving station;
- and
- e) means for generating a trouble signal upon detecting a change in position of the housing with respect to the magnetic field of the earth that exceeds a second predetermined threshold.
An alarm system comprising:
- a) an apparatus for detecting a change in position of an entrance closure comprising:
- i. a singular housing attached to the entrance closure being monitored;
- the housing comprising:
- 1. means for monitoring the magnetic field of the earth;
- 2. means for detecting a change in the position of the housing with respect to the magnetic field of the earth;
- 3. means for generating an alarm signal upon detecting a change in position of the housing with respect to the magnetic field of the earth that exceeds a first predetermined threshold;
- 4. means for transmitting by wireless transmission the alarm signal to a remote receiving station;
- and
- 5. means for generating a trouble signal upon detecting a change in position of the housing with respect to the magnetic field of the earth that exceeds a second predetermined threshold;
- and
- b) a receiving station located remotely from the housing comprising
- i. means for receiving by wireless transmission the alarm signal from the housing, and
- ii. means for indicating an alarm condition in response to receipt of the receipt of the alarm signal.
Dependencies are inferred from the claim text.