Calibration method for gas or vapor relative concentration senso

Details Calibration method for gas or vapor relative concentration senso Calibration method for gas or vapor relative concentration senso

1989-11-01

1991-07-23

Noland, Tom

Measuring and testing

Instrument proving or calibrating

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

73 2321, 36457103, G01D 1800

Patent

active

050332848

ABSTRACT:
This invention concerns a calibration method and compatible sensor construction for the determination of relative concentration of a gas or vapor. According to the method a sensor is brought to controlled conditions, in which at least one calibration point is determined, and then with the help of the calibration point measurement values the response of the sensor for the measured gas or vapor is computed. According to the invention, both the temperature of the sensor and the relative concentration of the desired gas or vapor is measured at the actual measurement site, and the temperature of the sensor is deviated from the ambient temperature so transiently that the partial pressure of the measured gas or vapor can be assumed to stay at least approximately constant at the measurement site, whereby the results of measurements performed at each deviated temperature level can be used for computing a correction factor for the calibration of the sensor. An improved measurement accuracy results from the uncomplicated calibration routine.

REFERENCES:
patent: 1758494 (1930-05-01), Behr
patent: 3973848 (1976-08-01), Jowett et al.
patent: 4117815 (1978-10-01), Ikeura
patent: 4468948 (1984-09-01), Nakayama
patent: 4500940 (1985-02-01), Kuisma
patent: 4505804 (1985-03-01), Mase et al.
patent: 4532016 (1985-07-01), Chambaz
patent: 4847783 (1989-07-01), Grace et al.

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