Filter
Top Products
F O R C E D A I R O V E N M A N U A L
Cascade TEK 5245-A NE Elam Young Parkway Hilllsboro Oregon 97124
Toll Free 888-835-9250 503-648-1818 FAX 503-648-1798 info@cascadetek.com www.cascadetek.com
REV 01.08
23
11.3 GN2 PURGE OPERATION
Description:
The GN2 purge allows for an inert atmosphere within the oven’s interior. Generally, the purge cycle should
force a volume of gas equal to 5 to 10 times the volume of the oven.
The atmosphere within the oven is a mixture of room air and the purging gas until the purge cycle is
completed. For this reason, the purge cycle should be finished before heat is applied to the chamber.
Failure to properly complete a purge cycle may result in oxidation. A slight positive pressure should be
maintained while running up to the set point temperature and throughout the heating portion of operation.
Gas atmosphere should be maintained until the work load is below the temperature at which oxidation will
occur. Oxidation is generally detectable by a discoloration seen in the product. 125C is considered the
highest / safe temperature. Most materials can be removed from the oven at this temperature without
discoloration.
Requires a customer supplied GN2 Source. The GN2 purge system includes a flow meter, solenoid valve
and event switch for operation via the Watlow 981 Controller.
Operation of GN2 Purge
See Watlow Manual for programming details
regarding “Event Outputs”.
“Event 3” = Turns ON the GN2 Purge Feature.
If another event number is to be used, it will be
labeled near the controller.
Press “Mode” button until “Event 3” displays.
Press the “UP” arrow to turn on the GN2 Purge
Flow Meter in your profile. Press the “DOWN”
arrow to turn off.
Adjustable Flow Meter
GN2 Inlet Connection