Malvern Instruments Spraytec, User Manual

Page: 136 / 221

Changing the lens
'
N o t e
. This applies to dual lens systems only.
On instruments supplied with both 300mm and 750mm lenses, it may be
necessary to change between these. The lens is attached to the Receiver casing.
'
N o t e
. Before fitting the 750mm lens, keep the lens at approximately the same
room temperature as the instrument for 30 minutes. Alternatively, fit
the lens but give it 30 minutes to reach the instrument temperature.
One-off measurements can be made anyhow, but if the 30 minute
period is not allowed for, longer measurements will show alignment
drift during this period.
%
Caution!
$
To change the lens:
.
Power off the instrument.
.
While holding the lens securely, use an Allen key to remove the two bolts
attaching the lens to the main casing. These are located diagonally, one
above and one below the lens.
.
Carefully remove the lens and place it in its storage case in a clean, dry
place.
.
Fit the new lens and tighten the two bolts.
C H A P T E R 8
S p r a y t e c
P a g e 8 . 2
M A N 0 3 6 8
Take care to support the lens while loosening the bolts – it is heavy!
Avoid touching the window in the Receiver.