Lightweight, compact detector of sudden changes in concentration

Details Lightweight, compact detector of sudden changes in concentration Lightweight, compact detector of sudden changes in concentration

1986-10-08

1988-08-02

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340661, 73 23, G08B 1710

Patent

active

047616393

ABSTRACT:
Lightweight, compact apparatus for detecting sudden changes in the concentration of at least one selected gas provides a warning when said gas concentration increases suddenly. In one embodiment, a chemically sensitive field effect transistor provides a sensing signal two amplifiers having different overall gains and widely different time constants. Detection of sudden gas concentration changes causes the relative magnitudes of the amplifier output signals to be inverted triggering a warning. The apparatus may occupy less than 1.25 cubic inches and weigh less than 4 ounces so that it may be worn by an individual throughout his work place.

REFERENCES:
patent: 3611335 (1971-10-01), Ogden et al.
patent: 3831432 (1974-08-01), Cox
patent: 3901067 (1975-08-01), Boardman, Jr. et al.
patent: 4039852 (1987-08-01), Miyamoto
patent: 4058368 (1977-11-01), Svensson et al.
patent: 4198851 (1980-07-01), Janata
patent: 4205307 (1980-05-01), Liermann

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