Chemistry: analytical and immunological testing – Hydrocarbon – Total hydrocarbon – flammability – combustibility
Patent
1987-01-21
1989-02-14
Richman, Barry S.
Chemistry: analytical and immunological testing
Hydrocarbon
Total hydrocarbon, flammability, combustibility
73 23, 73 27R, 422 94, 422 95, 422 96, 422 97, 436141, G01N 2716, G01N 2718
Patent
active
048046329
ABSTRACT:
A method detects the proportion of combustible gas in a mixture of air with a measuring device which operates by both the heat-tone and heat-conductivity methods. The method permits measurement in the full concentration range with a high degree of accuracy and the lowest possible energy consumption. The measuring device is made small and light and its sensor has a long service life. The method uses one single sensor which operates at a low temperature in the heat-conductivity mode or alternatively, catalytically active at a higher temperature in the heat-tone mode. If the measurement provides a result below a reference value or within a reference value window, measurement continues in the more accurate heat-tone mode. When the gas concentration increases during measurement, in order to avoid ambiguity of the measuring signal and damage to the sensor above a load-limit value, measurement again takes place in the heat-conductivity mode by reducing the temperature of the sensor.
REFERENCES:
patent: 2010995 (1935-08-01), Jacobson
patent: 2720108 (1955-10-01), Johnson
patent: 4258002 (1981-03-01), Barr
Iredale Peter J.
Johnson Alan
Schuck Hansjochen
Dragerwerk Aktiengesellschaft
McMahon Timothy M.
Ottesen Walter
Richman Barry S.
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