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MVI MANUAL Ion Science Ltd

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Unrivalled Detection. www.ionscience.com

Interferences

The MVI detector operates on the principle of UV light absorption. There are substances other than Mercury

which also cause light absorption and these substances are known as interference vapours.

Some of the interference vapours encountered are various hydrocarbons, water vapour, Sulphur compounds

and particles such as smoke. There is no measurable interference from Carbon Monoxide, Carbon Dioxide

or Ammonia. High concentrations of water vapour will give readings of between 5 to 10 µg/m³, however if

the MVI is zeroed at a similar humidity, this will not be seen under normal variations in the ambient

atmosphere.

Table of some interferences at 100 ppm concentration:

Compound Reading in µg/m³

Benzene 20

Toluene 3.5

Acetone 3.0

Ethyl Alcohol 6.0

Ethyl Acetate 3.0

1 2 ... 13 14 15 16 17 18 19 20 21 22 23

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Ion-science MVI Manual do Utilizador Página 18