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Legal Notice
Whilst every attempt is made to ensure the accuracy of the information contained in this manual, Ion Science accepts
no liability for errors or omissions, or any consequences deriving from the use of information contained herein. It is
provided "as is" and without any representation, term, condition or warranty of any kind, either express or implied. To
the extent permitted by law, Ion Science shall not be liable to any person or entity for any loss or damage which may
arise from the use of this manual. We reserve the right at any time and without any notice to remove, amend or vary
any of the content which appears herein.
Warranty
Standard Warranty can be extended to up to 2 years on the MVI when registering your instrument via
our website:
www.ionscience.com
To receive your Extended Warranty, you need to register within one month of purchase (Terms and
Conditions apply). You will then receive a confirmation email that your Extended Warranty Period has
been activated and processed.
Full details, along with a copy of our Warranty Statement can be found by visiting:
Introduction
The Mercury Vapour Indicator (MVI) is primarily used to monitor environments where mercury or any of the mercury
compounds are produced, processed or stored and applications where mercury vapours may pose a health hazard to
personnel.
Units of measurement used for detecting mercury vapour are micrograms/cubic metre expressed as µg/m
The MVI has two manually switched ranges of measurement:
0-199 µg/m
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with a resolution of 0.1 µg/m
3
0-1999 µg/m
with a resolution of 1 µg/m
Principle of Operation
A sample of the immediate atmosphere under investigation is drawn by the pump into a glass sampling cell where an
Ultra-Violet light source is absorbed by the sample. Photodiode detectors are used to measure the intensity of
radiation passing through the sample chamber. The optical system is designed specifically to detect mercury in the
Ultra-Violet region of 254 nm.
The presence of mercury vapour will reduce the radiation energy reaching the photodiode detector in proportion to
the vapour concentration. This change is then converted into an electrical signal and conditioned to provide a linear
reading on the front LCD as µg/m
An audible alarm is fitted which gives warnings when pre-set conditions are achieved.
Pioneering Gas Sensing Technology.
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Page 6 of 19
MVI Instrument User Manual V2.4
www.ionscience.com
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