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User Maintenance
Filter Replacement
Charcoal (Zero) Filter
It is advised that you replace the carbon filter after exposure to contaminants as it will become saturated with use.
To check the condition of the filter, use the following procedure:
a)
Turn the instrument ON and ensure that the
LO BAT indicator does not appear.
b)
Allow the instrument to warm up for 10 minutes.
Zero the instrument in fresh air.
c)
Connect the charcoal filter to the MVI. The
reading should not increase by more than
4 µg. If the reading increases by more than
4 µg then the filter must be replaced.
Always replace end caps to maximise life of filter.
PTFE Probe and Filter Assembly
The MVI is supplied with a PTFE probe and Luer filter. This can
become contaminated or loaded with dust in regular use. Typical
symptoms of contamination are a sluggish response to mercury and
an unstable zero. If either of these symptoms occurs, then the filter
must be replaced.
Replacing the filter:
a)
Unlock the Luer filter and discard
b)
Replace with a new filter
Alarm Level
The mercury alarm level is factory set at 20 µg/m
be set beyond 35 µg/m
3
.
MVI Health Check
Over time the internal filter and tubing can become contaminated. We, therefore, recommend carrying out an
occasional health check to ensure that the instrument is clean and not giving slow or false readings. There are 4
simple tests as detailed below which can be carried out by the user.
Prior to testing switch on the MVI and select the 0 to 2000 range. Leave the instrument to stabilise for 10 minutes
before proceeding.
Pioneering Gas Sensing Technology.
3
. These values are limited by unit accuracy. The alarm level cannot
Page 16 of 19
MVI Instrument User Manual V2.4
ionscience.com
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