Sample Preparation VacPrep 061
2-16 Feb 2013
5. Remove the stopper from the sample tube and attach the sample tube to the vacuum
fitting.
a. Loosen the knurled retaining nut.
b. Insert the sample tube fully into the fitting. You will feel a slight resistance as the tube
passes through the O-ring.
c. Turn the knurled retaining nut until it is finger-tight.
6. Hold the sample tube outside of the heating station as you perform the next three steps.
This position allows you to observe the sample as the analyzer begins to evacuate the tube
and to stop evacuation if sample material appears likely to be pulled out of the tube.
7. Turn all VAC/GAS control knobs to the OFF position (if they are not already in the OFF
position).
8. Turn the VAC/GAS control knob for the sample(s) to be degassed to the VAC position and
observe the sample. If the analyzer begins to pull sample material out of the tube,
immediately turn the VAC/ GAS control knob to the OFF position.
9. When the vacuum gauge reads 100 millitorr (100 mHg) or less, turn the VAC/GAS
control knobs for any previously evacuated stations to the VAC position.
The vacuum fitting for the sample tube may be hot enough to cause burns if it was
stored in a heating station instead of a cooling station. Wear the cotton gloves
supplied in the accessories kit and handle the fitting carefully to avoid burns.
Tighten the fitting retaining nut only finger-tight. Over-tightening may break the
sample tube.
To help prevent sample material from being pulled into the analyzer, slowly turn the
VACUUM/GAS control knob to the VAC position.
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