Thermal analog fire detector

Details Thermal analog fire detector Thermal analog fire detector

1993-07-02

1995-07-25

Swarthout, Brent

Communications: electrical

Condition responsive indicating system

Specific condition

340595, G08B 1700

Patent

active

054366143

ABSTRACT:
A thermal analog fire detector which is excellent in measurement precision and resolution in both the high and low temperature ranges and which has a wide range of measuring temperatures. A constant voltage E from a constant voltage circuit is supplied to a CPU, an A/D converter and a constant current circuit. The constant current circuit is connected in series to a thermistor. The constant current circuit is constructed to supply a constant current, the value of which being variable in a plurality of stages, to the thermistor controlled by the CPU. The CPU switches the constant current of the constant current circuit according to the measured temperature data. A voltage V across the thermistor is converted into digital data by the A/D converter, and then the converted data is supplied to the CPU.

REFERENCES:
patent: 4219803 (1980-08-01), Kuwabara et al.
patent: 4322725 (1982-03-01), Annetts
patent: 4555695 (1985-11-01), Machida et al.
patent: 5140302 (1992-08-01), Hara et al.

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