Humidity compensation for a photoionization type detector

Details Humidity compensation for a photoionization type detector Humidity compensation for a photoionization type detector

G - Physics

01

N

354/30

G01N 27/64 (2006.01) G01N 27/66 (2006.01)

Patent

CA 1270330

ABSTRACT HUMIDITY COMPENSATION FOR A PHOTOIONIZATION TYPE DETECTOR A photoionization type detector utilizes a photoionization sensor to detect the concentration of contaminants in the air, a humidity sensor to detect the water vapor concentration in the air and a temperature sensor to detect the temperature of the air. A microcomputer first calculates the water vapor concentration present in the air from the humidity and temperature sensor readings. Then, the microcomputer applies a predetermined correction factor corresponding to the calculated absolute humidity to the response of the photoionization sensor. This correction factor compensates for the negative cross-sensitivity of the photoionization sensor to the humidity in the air and produces an accurate contaminant concentration level which is then displayed.

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