G - Physics – 01 – N
Patent
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.
566071
Borden Ladner Gervais Llp
Mine Safety Appliances Company
LandOfFree
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