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3.5 Interference Gases

Some gases other than CO cause a sensor response, and thus are termed "interference gases".

Known interference gases are shown in Table 2.

Table 2: Known Interference Gases

Gas Concentration in PPM Reading in ppm

Hydrogen 1,000 100+

Nitric oxide 100 25

Table 3 shows levels of gases that are known to cause no sensor response.

Table 3: Known gases with no response

Gas Concentration

Ammonia 100 ppm

Carbon dioxide 5,000 ppm

Chlorine 5 ppm

Ethylene

2 %

Gasoline vapor

saturated

Hydrogen cyanide 10 ppm

Hydrogen sulfide

10 ppm

Isopropanol

1,025 ppm

Methane 10,000 ppm

Nitrogen dioxide

10 ppm

Sulfur dioxide

10 ppm

For indicated gases or vapors, prolonged exposure may reduce the efficiency of the sensor filter.

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