Humidity compensation for a photoionization type detector

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

1987-06-05

1988-10-18

Laroche, Eugene R.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250423P, G01T 118

Patent

active

047789980

ABSTRACT:
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 the humidity in the art and produces an accurate contaminant concentration level which is then displayed.

REFERENCES:
patent: 4429228 (1984-01-01), Anderson
patent: 4698314 (1987-10-01), Tao

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