Electrical fire hazard detector
First Claim
1. An electrical fire hazard monitoring device for detecting the presence of hazardous electrical arcing, said device comprising:
- means for receiving an RF signal emanating from hazardous electrical arcing;
means for filtering the RF signal to allow only frequencies within a predetermined bandwidth and duty cycle output range;
detection means for demodulating and pulse converting the received RF signal;
frequency and duty cycle detection means to sense frequencies within said predetermined bandwidth and duty cycle range, said frequency and duty cycle detection means producing a hazard detected signal in response to sensing frequencies within said predetermined bandwidth and duty cycles range;
integrator means for sensing the presence of said hazard detected signal during a first predetermined period of time; and
indicator means for providing an indication of said hazard detected signal being present for said first predetermined period of time.
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Accused Products
Abstract
An electrical fire hazard detector which senses an arcing condition in AC power distribution systems by sensing radio frequency radiation generated by arcing. The detector senses certain frequencies and duty cycle(s) present in a frequency selected, demodulated and pulse converted radio frequency signal and activates a visual and audible alarm. The detector is contained within a compact housing and includes: a power on LED; an electrical fire hazard detected LED; a CLEAR push-button; a TEST push-button; an audible alarm; and a range/sensitivity switch. The TEST push-button simulates a detected hazard for insuring proper operation of the detector. The CLEAR push-button resets the detector after a simulated or real detection of an electrical fire hazard. The range/sensitivity switch selects either a MINIMUM or MAXIMUM detection range by connection to an internal antenna, which may be a directional type antenna, or to the power distribution system respectively. The detector is a low cost device in that it contains a compact transformerless AC-DC power supply and only two standard integrated circuits, namely a PLL frequency detector and a quad comparator. The device can be powered either from a standard electrical outlet or from a battery. When the device is powered from a battery, the housing can be removed from its mounting location, and with the use of a directional or omnidirectional type antenna can be hand held to localize the source of the hazard.
42 Citations
20 Claims
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1. An electrical fire hazard monitoring device for detecting the presence of hazardous electrical arcing, said device comprising:
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means for receiving an RF signal emanating from hazardous electrical arcing; means for filtering the RF signal to allow only frequencies within a predetermined bandwidth and duty cycle output range; detection means for demodulating and pulse converting the received RF signal; frequency and duty cycle detection means to sense frequencies within said predetermined bandwidth and duty cycle range, said frequency and duty cycle detection means producing a hazard detected signal in response to sensing frequencies within said predetermined bandwidth and duty cycles range; integrator means for sensing the presence of said hazard detected signal during a first predetermined period of time; and indicator means for providing an indication of said hazard detected signal being present for said first predetermined period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for detecting the presence of hazardous electrical arcing, said method comprising:
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receiving an RF signal emanating from hazardous electrical arcing; filtering the RF signal to allow only frequencies within a predetermined bandwidth and duty cycle range to pass therefrom; demodulating and pulse converting the RF signal; sensing frequencies within the predetermined bandwidth and duty cycle and producing a hazard detected signal in response to the frequencies within the predetermined bandwidth and duty cycles within a predetermined range; sensing that the hazard detected signal has been present for a first predetermined period of time; and providing an indication of the hazard detected signal being present for the first predetermined period of time. - View Dependent Claims (16, 17)
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18. An electrical hazard indicating device for detecting hazardous electrical arcing comprising:
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an RF receiver for receiving RF radiation generated by electrical arcing; a circuit coupled to said RP receiver including a first integrated circuit for detecting frequency and duty cycle components of the RF radiation, and a second integrated circuit for determining when said frequency and duty cycle components fall within a predetermined range; and alarm means coupled to said circuit for indicating the presence of hazardous electrical arcing. - View Dependent Claims (19, 20)
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Specification