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Operating controls
The MVI indicating display and all operating controls are mounted on the front panel where they are readily accessible
when the unit is held in the operating position.
1.
The ON/OFF switch is located immediately below the display and to the left. In the ON position the MVI will
operate and display. In the OFF position, battery power to the MVI is disconnected. The instrument MUST also
be switched OFF to enable charging.
2.
The Zero Adjust control is located at centre of the panel between the handle and display. A ten turn
potentiometer is used to manually set the display to zero, provided that the instrument is in a mercury free
atmosphere. The MVI is designed to show both positive and negative readings and can be adjusted between ±
240 µg/m
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by use of the zero control. Zero drift shown on the display is normal and is caused by changes in
temperature or humidity. The zero control is used to cancel out any negative or positive change on the display
prior to taking a reading.
3.
Range Switch
a)
2000
in this range the instrument will measure over a range of 0-1999 µg/m
b)
200
in this range the instrument will measure over a range of 0-199 µg/m
ON/OFF Switch
Pioneering Gas Sensing Technology.
Page 10 of 19
MVI Instrument User Manual V2.4
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in steps of 1 µg/m
3
in steps of 0.1 µg/m
Zero Adjust
Range Switch
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