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Sensor/Transmitter, Toxic Gas & Oxygen ENMET Corporation

Appendix A: Interference Table

For Selected Sensors

Ammonia (3E-100 sensor)

The following gases cause a reading:

Interferant

Gas/Vapor

Interferant Concentration

in ppm

Instrument Reading

in ppm

ethanol

1000

isopropanol

450

hydrogen sulfide

methanol

1200

hydrogen

1000

carbon monoxide

300

100

sulfur dioxide

nitrogen dioxide

hydrogen cyanide

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

Interferant Gas/Vapor

Concentration in ppm

chlorine

unsaturated hc (ethylene)

1.0 %

saturated hydrocarbons

abundant

Carbon Monoxide (3E sensor)

The following gases cause a reading:

Interferant

Gas/Vapor

Interferant Concentration

in ppm

Instrument Reading

in ppm

hydrogen

1000

450

nitric oxide

100

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

Interferant Gas/Vapor

Concentration in ppm

ammonia

100

chlorine

hydrogen cyanide

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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