Cascade Sciences CVO-5-EX Series, Installation & Operation Manual, Page: 34 / 132

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INTRODUCTION
P
URGE
G
AS
S
YSTEM
R
EQUIREMENTS
Oven Purge and Pressurize System Function
A safe gas supply is required to purge and over-pressurize the oven electronics and heating elements
safety enclosures before the oven can be turned on. The compressed gas may be:
•
Air of instrument quality
•
Gas nitrogen (GN
RR
2
RR
)
Oven Chamber Backfilling Function
In its default configuration, the oven uses the purge and pressurize gas supply to backfill the
vacuumed down oven chamber.
Optional:
A second clean air or gas nitrogen supply can be
attached to the Backfill port to backfill the oven chamber with a gas source separate from the
purge and pressurize system source.
Your process SOP or recipes must state which gas source will be used to backfill the oven chamber.
Purge and Pressurize Gas Supply System Requirements
• The oven requires a sustained flow of 4.2 cubic feet per minute of gas flow to purge the
electronics and heating elements enclosures and to establish and maintain overpressure
(117.5 normal liters per minute).
• The gas supply tubing connected to the oven must be protected against mechanical
damage and accidental disconnection.
•
The gas supply system must have a power source separate from the oven If it is
electronically controlled or generated.
• The gas system must supply a continual flow of gas to the oven during oven operation.
Connection Requirements
Use ¼ inch OD (outside dimension) tubing to connect to the ¼ inch gas port fittings on the back
of the oven. These ports are labeled
Purge & Pressurize
and
Backfill.
Use tubing clamps to
secure the tubing to the fitting.
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