Event detection device with fault monitoring capability
First Claim
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1. An event detection device, comprising:
- a first sensor to generate a first output signal in response to the detection of an event, the first sensor generating a second output signal to prevent activating a fault indicating circuit upon detecting the event on a second occasion within a predetermined time interval; and
a comparator to compare the first output signal with a threshold signal and activate a timed sequence processor when the first output signal exceeds the threshold signal on a first occasion, the timed sequence processor being adapted to activate the fault indicating circuit after the predetermined time interval unless the first sensor generates the second output signal in response to the detection of an event on the second occasion within the predetermined time interval.
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Abstract
An event detection device comprising a sensing means for generating an output signal in response to the detection of an event, the device comprising a fault monitoring system which comprises: comparator means for comparing the output signal with a threshold signal and for activating a timed sequence processor when the output signal exceeds the threshold signal on a first occasion, the time sequence processor being adapted to activate a fault indicating circuit after a predetermined time interval unless the sensing means generates an output signal in response to the detection of an event on a second occasion within the predetermined time interval.
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Citations
15 Claims
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1. An event detection device, comprising:
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a first sensor to generate a first output signal in response to the detection of an event, the first sensor generating a second output signal to prevent activating a fault indicating circuit upon detecting the event on a second occasion within a predetermined time interval; and
a comparator to compare the first output signal with a threshold signal and activate a timed sequence processor when the first output signal exceeds the threshold signal on a first occasion, the timed sequence processor being adapted to activate the fault indicating circuit after the predetermined time interval unless the first sensor generates the second output signal in response to the detection of an event on the second occasion within the predetermined time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An event detection device, comprising:
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a sensor to generate an output signal in response to the detection of an event, the sensor generating a second output signal to prevent activating a fault indicating circuit upon detecting the event on a second occasion within a predetermined time interval; and
a timed sequence processor coupled to the sensor and adapted to be triggered on a first occasion to activate a fault indicating circuit after the predetermined time interval unless the sensor generates the second output signal in response to the detection of an event on a second occasion within the predetermined time interval; and
one or more additional sensors coupled to the timed sequence processor to generate one or more confirmatory output signals in response to the event. - View Dependent Claims (14, 15)
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Specification