32
Purging the Stage Method 2
This method uses an inert gas from a gas cylinder
to purge the stage at temperatures above ambient
when the LNP95 is not required.
1.
Make sure the Stage Lid is in place and the
Stage Door is closed.
2.
From a gas cylinder connect the Gas Insert
with a tubing 3mm inner diameter and 6mm
outer diameter to the Gas Purge Valve (1).
3.
Connect a Gas Insert to the opposite side Gas
Purge Valve (2).
4.
Use the gas regulator to set a gas flow rate of
1.5L/min.
5.
With the gas flowing through the Sample
Chamber, block the gas outlet for a few sec-
onds and releasing the gas outlet valve with a
finger. Do this for a few minutes to purge the
stage.
Reduce the gas flow rate to 20cc/min to continu-
ously purge the stage or remove the two Gas
Inserts to keep the chamber under closed inert
atmosphere.
Note: Helium gas is not recommended for contin-
uous purging. This gas has a very high thermal
conductivity and will cool the silver heating block
too much during an experiment and may cause the
temperature to fluctuate.
2
1
To gas cylinder
Block and release
outlet valve with
finger
