Heat detector including device for detecting abnormality of exte

Details Heat detector including device for detecting abnormality of exte Heat detector including device for detecting abnormality of exte

1994-03-25

1995-09-05

Swarthout, Brent

Communications: electrical

Condition responsive indicating system

Specific condition

340587, 340584, 340508, 374 30, G08B 1700

Patent

active

054482240

ABSTRACT:
A heat detector includes an external temperature detector for detecting an external temperature outside the heat detector and an internal temperature detector for detecting an internal temperature inside the heat detector. A microcomputer calculates a temperature difference between the external temperature detected by the external temperature detector and the internal temperature detected by the internal temperature detector. The microcomputer monitors the above-described temperature difference to detect an event in which the temperature difference has remained greater than a predetermined value for a predetermined duration or longer. If the microcomputer detects that the temperature difference has remained greater than the predetermined value for the predetermined duration or longer, the microcomputer outputs an abnormal signal representing that the external temperature detector is abnormal.

REFERENCES:
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patent: 3765238 (1973-10-01), Somikama
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patent: 5107246 (1992-04-01), Mogaky
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patent: 5172099 (1992-12-01), Glaser
patent: 5198801 (1993-03-01), Duggan et al.
Patent Abstracts of Japan, vol. 5, No. 32 (P-050) 27 Feb. 1981.

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