Despatch Protocol Controller - Manual (Page 13)

7
NOTE: The CZO function is
easily set for specific operating
conditions.
NOTE: Reset times greater than 35
seconds/repeat are not recommended
.
Table 4 Calibration Zero Offset Examples
CZO Display Temperature
measured by sensor
Offset EF Temperature Indication
0.0
4.0
10.0
10.0
-10.0
100 EF
150 EF
150 EF
300
EF
300 EF
0 E
2 E
5 E
20
E
-20 E
100 EF
152 EF
155 EF
320
EF
280 EF
A more useful formula is one the user can use to
calibrate Protocol to match the center of the chamber.
This requires a temperature measuring device with its
thermocouple junction located at the center of the
chamber. CZO can be directly calculated by:
Tune Setting
The Protocol has been preset and tested for normal operating conditions. Special
instructions for changing the tune setting are referenced in the Appendix of this manual.
The Protocol on the oven can be manually tuned. For your convenience the factory has
tested and preset the PID action to its optimum values. These values need not be
changed under normal operating conditions.
Table 5 Factory PID Settings
Proportional Band
Reset Time
Rate Time 5 degrees
30 seconds/repeat
0 degrees/second