Thermo Scientific F30400, Installation And Operation Manual

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7
Single Setpoint Models w/OTP
Tuning
Thermo Scientific Large Tabletop Muffle
25
Tuning
This controller incorporates a self-tuning feature, which determines the optimum control parameters
for the best temperature accuracy with your load and setpoint. Use this feature the first time you use
your furnace and each time you change either your setpoint or the type of load you are heating.
Thermo Fisher Scientific recommends you use this feature to provide the best temperature accuracy the
controller can attain. To use the tuning feature:
1. Start tuning with the process at ambient temperature. This allows the tuner to calculate the low
cutback and high cutback values more accurately.
2. Adjust the setpoint to your desired value.
3. Press the SCROLL button until display reads, “A.TUNE.”
4. Press the UP or DOWN button to select, “on.”
5. Press the PAGE button to return to the HOME DISPLAY. The display will alternately flash
between “tunE” and the HOME DISPLAY while tuning is in progress.
6. The controller will then turn the heating on and off to induce an oscillation. When the measured
value reaches the required setpoint the first cycle will end.
7. Tuning will be complete after two oscillation cycles and then the tuner will turn itself off.
8. Normal control function will resume after the controller calculates tuning parameters.
Furnace must be at ambient temperature before starting a tune. “Stat” and “Sp.rr”
must be set to OFF or “tunE” will not initiate.
Tune has completed when “tunE” stops flashing on display.