ENMET SPECTRUM - Manual (Page 20)

ENMET Corporation SPECTRUM Series
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Appendix B: Interference Gases Appendix B: Interference Gases Appendix 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