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MVI MANUAL
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
Benzene
Toluene
Acetone
Ethyl Alcohol
Ethyl Acetate
Unrivalled Gas
Reading in µg/m³
20
3.5
3.0
6.0
3.0
Detection.
Page 18 of 23
Ion Science Ltd
ionscience.com
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