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M4557 - Model 9210 Nitriding Controller
SSi Manual SERIES 9210-M4557-Nitriding Page 48 of 48
Chapter 6 - APPLICATIONS INFORMATION
Standard Event Assignments
To simplify operation and maintain consistency, SSI has adopted the following event assignments.
Event 0 Nitrogen Addition
Event 1 Ammonia Addition
Event 2 Disassociated Ammonia Addition
Event 3 Hydrogen Addition
Event 4 Spare
Event 5 Spare
Event 6 Spare
Event 7 Sample Cell Enable
Event 8 Spare
Event 9 Spare
Event 10 Spare
Event 11 Spare
Event 12 Spare
Event 13 Spare
Event 14 Spare
Event 15 Spare
Typical Nitriding Instrument Designations
Instrument 7 – Nitrogen
Instrument 8 – Ammonia
Instrument 9 – Disassociated Ammonia
Nitriding Recipes/Programs
Nitriding Recipes can be broken down into three stages, Startup, Nitriding and Shutdown
In the Startup phase of the recipe, the furnace starts to heat up and is purged with Nitrogen. As a general
rule to assure safe operation of the furnace, the furnace should be purged with Nitrogen long enough to
allow for 5 to 7 volume changes. This ensures that it will be safe to add Ammonia and/or Dissociated
Ammonia when required. This purge time is determined by calculating the furnaces volume and dividing by
the Nitrogen Flow. The startup phase can also start adding ammonia once the desired purge time and
temperature has been achieved.
In the Nitriding process stage of the recipe, the temperature and %Dissociation/Kn setpoints are set and
the Soak times are set as well. This phase will also enable the Trim enable feature for ammonia to allow
for control of the furnace atmosphere to setpoint.
After the Nitriding process stage, the shutdown routine will run. This typically involves, shutting off the
Ammonia and Dissociated Ammonia, turning on Nitrogen and lowering the temperature setpoint to allow
the furnace to cool. This stage will also sound an alarm indicating the process is complete.
SAMPLE RECIPES
Recipe 1
Step OpCode Temp ATM Options
S1 Go-Sub 50