Method and apparatus for calibrating a gas detector sensor

Details Method and apparatus for calibrating a gas detector sensor Method and apparatus for calibrating a gas detector sensor

1994-10-31

1997-09-30

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01N 100

Patent

active

056728069

ABSTRACT:
An improved method and apparatus for calibrating a gas sensor which exhibits a change in electrical characteristics in response to exposure to a gas. The apparatus comprises a resistor array and a chart. The chart comprises a list of predetermined resistor combinations corresponding to a range of output levels for the sensor. The resistor array is coupled to the output of the sensor. When exposed to a gas, the sensor exhibits a change in conductivity producing an output which generates an output signal with the resistor array. The level of the output signal is measured. The measured level is then compared to predetermined values on the chart which also lists the appropriate resistor combination for each value or range of values. The resistor combination is then set as indicated by the chart.

REFERENCES:
patent: 4150366 (1979-04-01), Price
patent: 4788620 (1988-11-01), Scott
patent: 4914424 (1990-04-01), Hirao et al.
patent: 5320733 (1994-06-01), Bohm

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