ENMET SPECTRUM-RAL - Manual (Page 9)

S PECTRUM RAL ENMET Corporation
7
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.