Corrosion Of Temperature Overshoot - Thermo Scientific BF51841C Operation Manual

Correction of Temperature Overshoot
The controller will cycle three times heating and cooling pattern, measuring the
characteristics of the load and chamber temperature controls. During the auto
tuning, At will alternately flash with the measured temperature (PV) to indicate that
the auto tuning is in progress. The length of time for the auto tune varies with the
load, camber size and temperature selected.
The auto tune is completed when the regular display of the measured temperature
is shown. The chamber should now operate to the process temperature with the
given product load, with the quickest response and minimal temperature
overshoot.
If the process temperature or load changes significantly, another auto tune
session may be necessary to optimize the chamber performance.
Correction of Temperature Overshoot
An alternative method of running the auto tune is to select the target setpoint
followed immediately by the activation of the autotune furnace.
This method allows the autotune to correct for overshoot of the temperature
overshoot.
As the furnace heats to the setpoint, the autotune will begin when the measured
temperature (PV) equals the setpoint and follows the three cycles described
above.
Thermo Scientific 6-7