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7.4 PREPARE A CLEAN FOLLOwER AND FUNNEL
Ensure that a clean follower and the relevant filling funnel are ready for use.
Note that the large circular funnel is used for granules and the long funnel is used for powder. The
long funnel prevents the powder sticking to the sides of the barrel.
Do NOT place the funnel onto the top of the barrel until the sample is being loaded otherwise it will
become hot and the polymer may stick to it.
7.5 CLEAN THE DIE BORE
The die bore can only be cleaned by blowing through with high-pressure nitrogen.
Do NOT try to clean the die bore by pushing wire etc through it. If the wire breaks inside the die, then
a new die may be required.
Always clean the die immediately after use
even if another test is not going to be performed
afterwards.
Place the die into the recess of the die retaining
nut with the end containing the O Ring facing
upwards.
Screw the die retaining nut with the die to the
bottom of the barrel and hand tighten using the
tightening tool.
Loosen off by about 1/10th of a turn (about 30
degrees) otherwise it will be very difficult to
remove once it has heated up and expanded.
Fit the top cap to the top of the barrel and tighten securely using the tightening tool to seal the barrel.
Press the key under FULL to apply the nitrogen gas to the barrel. Wait until the gas can be heard
flowing freely through the die, noting that the sound will change when the die is clean.
Press the key under GAS OFF to release the gas pressure, check that the display shows nominally
zero then remove the top cap using the tightening tool.
7.6 PURGE THE BARREL wITH NITROGEN GAS
Press the key under PURGE to allow a low volume of nitrogen gas to flow through the barrel to
displace any air that may be present. Allow the gas to flow for a few seconds to ensure that the barrel
is full of nitrogen.
Shown: Retaining nut with die
PET Plus User Manual
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