Temperature compensated alarm system
First Claim
1. A temperature compensated alarm system comprising:
- an alarm sensor having a known temperature characteristic and operative to produce an electrical output signal representative of a desired parameter to be monitored;
a temperature transducer operative to provide an electrical output signal representative of the ambient temperature in vicinity of the transducer;
a plurality of selectively addressable storage registers containing data representative of alarm threshold limits applicable at specified ambient temperatures;
an electronic processing module including;
means for sampling said alarm sensor and temperature transducer output signals;
means for addressing and accessing threshold data from at least one selected register of said plurality in response to said transducer output signal; and
means for generating an alarm signal if said sensor output signal exceeds said threshold data from said at least one selected register.
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Accused Products
Abstract
A temperature compensated alarm system includes a temperature transducer operative to produce an electrical output signal indicative of the ambient temperature, an alarm sensor, an electronic processing module, and a plurality of addressable registers for storing alarm threshold limits applicable at the operative ambient temperature. At selected times the electronic processing module reads a value indicative of the ambient temperature and thereupon determines the applicable alarm threshold limits by addressing the respective registers containing threshold limit data for the particular ambient temperature. In one embodiment, two sets of registers are provided; one set of registers containing higher sensitivity threshold limit data and the second set containing lower sensitivity threshold limit data. The applicable threshold data is determined by the state of a user settable switch.
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Citations
11 Claims
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1. A temperature compensated alarm system comprising:
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an alarm sensor having a known temperature characteristic and operative to produce an electrical output signal representative of a desired parameter to be monitored; a temperature transducer operative to provide an electrical output signal representative of the ambient temperature in vicinity of the transducer; a plurality of selectively addressable storage registers containing data representative of alarm threshold limits applicable at specified ambient temperatures; an electronic processing module including; means for sampling said alarm sensor and temperature transducer output signals; means for addressing and accessing threshold data from at least one selected register of said plurality in response to said transducer output signal; and means for generating an alarm signal if said sensor output signal exceeds said threshold data from said at least one selected register. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for providing temperature compensation in an alarm system comprising the steps of:
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producing a first electrical signal having a characteristic representative of ambient temperature; producing a second electrical signal representative of a specified parameter to be monitored; selectively addressing at least one digital storage register containing data representative of alarm threshold limits based upon said first electrical signal characteristic representative of ambient temperature; accessing said threshold limit data contained in said at least one digital storage register; and generating an alarm signal if said second electrical signal has a value exceeding said threshold limit data. - View Dependent Claims (10, 11)
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Specification