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MVI MANUAL
User maintenance
Alarm Level
The Mercury alarm level is factory set at 20 µg/m
be set beyond 35 µg per metre cube.
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 2000 range. Leave the instrument to stabilise for 10 minutes before
proceeding.
Test 1:
Can the MVI be zeroed?
Zero the MVI in clean air (do not use the charcoal filter). Can the MVI be zeroed? If not, then a service is
required. If yes, then continue.
Test 2:
Check for internal contamination
Using a clean piece of flat card or plastic, block the air flow to the luer connector. This will force air to be
drawn from the internal parts and any contamination will show on the display. If the reading increases by
a value greater that 5 ug/m
Test 3:
Check for case contamination
Use a clean, dry cotton bud and scrub the lid top where dirty. Offer the bud to the luer inlet and note any
reading changes. A change of greater than 5 ug/m
Test 4:
Does the MVI detect Mercury?
Obtain a sample of mercury and offer this to the inlet. Check that the MVI responds accordingly. If the
instrument does not detect any Mercury then the MVI will require servicing.
Unrivalled Gas
3
. These values are limited by unit accuracy. The alarm level cannot
then the MVI internal parts are contaminated and service is required.
3
Detection.
Page 20 of 23
3
indicates the case requires some cleaning.
ionscience.com
Ion Science Ltd
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