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Allow the liquid nitrogen to just evaporate to
dryness then lower the grinder lid and lock with
the clip.
Start the grinder by pushing the pre-set timer
valve fully inwards to give approximately 30-45
seconds grinding.
The grinder stops automatically to prevent over
grinding and heat build up which could degrade
the sample.
Wait until the grinding period has finished and
the grinding blade has ceased to rotate.
Release the clip at the front of the grinder and
lift the lid.
Shown: Preset timer valve
Lift the grinding bowl and shake it gently by hand
until all the powder has been sieved out into the
collecting bowl.
Pour more liquid nitrogen into the grinding bowl
until the level of the liquid is about 1cm or 1/2"
above the remaining polymer chip level.
Allow the liquid nitrogen to just evaporate to
dryness then lower the grinder lid and lock with
the clip.
Start the grinder by pushing the pre-set timer
valve fully inwards to give approximately 30-45
seconds grinding.
Wait until the grinding period has finished and
the grinding blade has ceased to rotate.
Release the clip at the front of the grinder and
lift the lid.
Lift the grinding bowl and shake it gently by hand
until all the powder has been sieved out into the
collecting bowl.
Continue the above procedure until most of the
sample has been reduced to powder.
Remove the receiving bowl and transfer the
powder to the sample phials as shown later.
Clean the grinder blade, grinding bowl, collecting
funnel and collecting bowl.
62 PET Plus User Manual
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