Chemistry: physical processes – Physical processes – Crystallization
Patent
1974-12-18
1976-01-20
Reese, Robert W.
Chemistry: physical processes
Physical processes
Crystallization
23254E, 23255E, 340237R, G01N 2716
Patent
active
039334333
ABSTRACT:
A method of gas detection and differentiation between various noxious gases including exposing a semi-conductor catalytic sensor in the atmosphere to be evaluated, sequentially providing first and second voltage level inputs to the sensor, and determining the relative change in the output of the sensor as said input voltage is changed from the first level to a second level. A reduction in the output of the sensor in response to the increase in input voltage corresponds to the presence of carbon monoxide and the absence of hydrocarbons in the atmosphere being evaluated. An increase in the sensor output in response to an increase in the input voltage indicates the presence of hydrocarbons in the atmosphere being evaluated.
A method of calibrating the semi-conductor catalytic gas sensor including purging the sensor of any gas by applying a first input voltage to heat the sensor and oxidize any noxious gases collected thereon, then applying a second input voltage to the sensor in an uncontaminated atmosphere to heat the sensor to a second lower temperature, and then adjusting an indicator to a predetermined value.
REFERENCES:
patent: 1791912 (1931-02-01), Story
patent: 1979976 (1934-11-01), Marshall
patent: 2857251 (1958-10-01), Krogh
patent: 2904406 (1959-09-01), Moore
patent: 3418914 (1968-12-01), Finkin
patent: 3482233 (1969-12-01), OGG
patent: 3603954 (1971-09-01), Takeuchi
patent: 3865550 (1975-02-01), Bott et al.
Dynamation Enterprises, Inc.
Reese Robert W.
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