Specificity of semiconductor gas sensor

Details Specificity of semiconductor gas sensor Specificity of semiconductor gas sensor

1978-06-07

1981-03-17

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

73 23, 250301, 328 1, 340631, 340634, G01N 2712

Patent

active

042569850

ABSTRACT:
A gas sensor unit designed to indicate the presence of hydrocarbon vapors but be insensitive to carbon monoxide. The unit comprises two TGS sensors, one covered by a semi-permeable membrane and the other uncovered; the uncovered sensor responds to both crude oil and carbon monoxide, the covered sensor responds only to carbon monoxide. In one embodiment, the two sensors are connected in series; the total response of both sensors and the difference in response between the two sensors are measured, and changes in the parameters indicate the presence of an oil spill. In another embodiment, each sensor's output is compared with its reference voltage; if the uncovered sensor has an output that is higher than its reference while the covered one does not, the presence of an oil spill is indicated.

REFERENCES:
patent: 3864628 (1975-02-01), Klass et al.
patent: 3922656 (1975-11-01), Horvath et al.
patent: 3961248 (1976-06-01), Kawamura
patent: 4088986 (1978-05-01), Boucher

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