Fire dector including a non-volatile memory
First Claim
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1. A fire detector (1) comprising:
- a CPU (2) including a non-volatile memory (2a) in which a code is recorded representative of at least one characteristic element specific to said fire detector; and
a fire sensor (3) that measures a physical magnitude whose variation serves to detect the existence of a fire in the vicinity of the fire detector, said fire sensor delivering an analog electrical signal (i) referred to as a "measurement" signal to the CPU (2), the value of the measurement signal being representative of the physical magnitude measured by the fire sensor, the above-mentioned characteristic element including a normal value iO for the measurement signal in the absence of a fire;
the detector being characterized in that;
the fire detector further includes interface means (5,
6) giving access to the contents of the non-volatile memory (2a) without dismantling the fire detector;
the non-volatile memory (2a) further includes dates on which maintenance operations of said fire detector have been performed; and
the CPU (2) is programmed to compare the measurement signal (i) with the normal value iO of the measurement signal on each occasion that it receives an instruction from the interface means (5,
6) to record a maintenance date, and to refuse to record it whenever the measurement signal (i) does not lie within the range iO-Δ
1 to iO+Δ
2, where Δ
1 and Δ
2 are predetermined values.
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Abstract
The invention relates to fire detector comprising a CPU and a sensor providing an analog measurement signal to the CPU. The CPU includes a non-volatile memory in which at least one normal value for the measurement signal and maintenance dates are recorded, the fire detector also including an interface giving access to the contents of the non-volatile memory without disassembling the fire detector. On each occasion that maintenance has been performed, a new maintenance date is recorded in the non-volatile memory. Nevertheless, such recordal is prevented if the measurement signal differs excessively from its normal value.
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Citations
7 Claims
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1. A fire detector (1) comprising:
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a CPU (2) including a non-volatile memory (2a) in which a code is recorded representative of at least one characteristic element specific to said fire detector; and a fire sensor (3) that measures a physical magnitude whose variation serves to detect the existence of a fire in the vicinity of the fire detector, said fire sensor delivering an analog electrical signal (i) referred to as a "measurement" signal to the CPU (2), the value of the measurement signal being representative of the physical magnitude measured by the fire sensor, the above-mentioned characteristic element including a normal value iO for the measurement signal in the absence of a fire; the detector being characterized in that; the fire detector further includes interface means (5,
6) giving access to the contents of the non-volatile memory (2a) without dismantling the fire detector;the non-volatile memory (2a) further includes dates on which maintenance operations of said fire detector have been performed; and the CPU (2) is programmed to compare the measurement signal (i) with the normal value iO of the measurement signal on each occasion that it receives an instruction from the interface means (5,
6) to record a maintenance date, and to refuse to record it whenever the measurement signal (i) does not lie within the range iO-Δ
1 to iO+Δ
2, where Δ
1 and Δ
2 are predetermined values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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Current AssigneeEugeniusz Smycz, Lewiner, Jacques
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Original AssigneeEugeniusz Smycz, Lewiner, Jacques
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InventorsSmycz, Eugeniusz, Lewiner, Jacques
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Primary Examiner(s)Hofsass, Jeffery A.
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Assistant Examiner(s)HUANG, SIHONG
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Application NumberUS08/776,424Time in Patent Office481 DaysField of Search340/628, 340/629, 340/630, 340/577, 340/578, 340/579, 340/693, 340/506, 340/511, 340/514, 340/588, 340/589, 340/825.06, 364/188US Class Current340/506CPC Class CodesG08B 17/00 Fire alarms; Alarms respons...
