Ion Science MVI - Manual (Page 11)

MVI MANUAL Ion Science Ltd
Page 11 of 23
Unrivalled Detection. www.ionscience.com
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
3
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 0-2000 µg/m
3
in steps of 1 µg/m
3
.
b) 200 in this range the instrument will measure over a range of 0-200 µg/m
3
in steps of 0.1
µg/m
3
.
ON/OFF Switch Range Switch
Zero Adjust