13
Cooling Connections
These connections need only be made if the
experiments are to be carried out below room
temperature.
The Gas Purge Valve (1) is opened when the Gas
Insert (2) is pushed firmly into the connector. A
“click” is heard when the two parts are connected
properly. To remove the Gas Insert, push the
outer sleeve of Gas Purge Valve toward the stage
and the Gas Insert (2) should drop out.
There is a second Gas Purge Valve (3) on the
opposite side of the stage to allow the gas to leave
the stage. A Gas Insert must also be inserted into
this Gas Purge Valve (3) when purging.
Purging the Stage
This method uses an inert and dry gas from a gas
cylinder to purge the stage.
1.
Make sure the Stage Lid is in place and the
Stage Door is closed.
2.
Either use the LinkPad touch screen or
Linksys32 software to heat the stage to 40°C.
3.
From a gas cylinder connect the Gas Insert
with a tubing 3mm inner diameter and 6mm
outer diameter to the Gas Purge Valve (1).
4.
Connect a Gas Insert to the opposite side Gas
Purge Valve (2).
5.
Use the gas regulator to set a gas flow rate of
1.5L/min.
6.
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. Repeat 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.
Block and release
outlet valve with
finger
1
2
3
1
To gas cylinder
