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ENMET Corporation SPECTRUM Series

Appendix B: Interference Gases

Appendix B: Interference GasesAppendix B: Interference Gases

Appendix B: Interference Gases

Interference Table for Selected Spectrum Sensors

SPECTRUM Series for AMMONIA (3E-100 sensor)

The following gases cause a reading:

Interferant

Gas/Vapor

Interferant

Concentration in ppm

Instrument

Reading in ppm

ethanol 1000 1

isopropanol 450 1

hydrogen sulfide 14 10

methanol 1200 3

hydrogen 1000 80

carbon monoxide 300 100

sulfur dioxide 25 -21

nitrogen dioxide 50 25

hydrogen cyanide 10 -18

The following gases or vapors have been tested and do not cause a reading:

Interferant Gas/Vapor Concentration in ppm

chlorine 5

unsaturated hc (ethylene) 1.0 %

saturated hydrocarbons abundant

SPECTRUM Series for CARBON MONOXIDE (3E sensor)

The following gases cause a reading:

Interferant

Gas/Vapor

Interferant Concentration

in ppm

Instrument Reading

in ppm

hydrogen 1000 450

nitrogen oxide 100 25

The following gases or vapors have been tested and do not cause a reading:

Interferant Gas/Vapor Concentration in ppm

ammonia 100

chlorine 5

hydrogen cyanide 10

ethylene 2.0 % *

carbon dioxide 5,000

methane 10,000

sulfur dioxide 10 *

hydrogen sulfide 10 *

nitrogen dioxide 10 *

isopropanol 1,025 *

gasoline vapor saturated *

*with onboard filter; continuous high level exposure may reduce the filter efficiency

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