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10.6 SETTING THE TIMER
The timer can be set to a wide range of time
periods but its main use is provide a 50 minutes
or 55 minutes timing for drying polymer powder.
Check that the 3 controls are set as below:
n Mode = Top Right Screw = A
n Full Scale = Bottom Left Screw = 1
n Time Scales = Bottom Right Screw = h
A small terminal screwdriver is required to
adjust.
Rotate the relevant screw to set the unit as
shown below:
Set the dial to 0.82 to select 50 minutes.
Using a suitable container and laboratory balance, weigh out 3.6g of polymer powder. Pour the
sample into a sample drying tube (glass phial) then screw the cap onto the top of the tube. Tighten
the cap sufficiently to give a good seal between the silicone rubber gland and the glass tubing but do
not over tighten.
Turn the vacuum valve in the plastic vacuum tube to closed (lever is at 90 degrees to the vacuum
pipe).
A
1
h
Set the dial to 0.92 to select 55 minutes.
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