User manual

43
Controller Operation
Calibration Parameters
9.12 Calibration Parameters
The operator of the Micro-Bath controller has access to a number of the bath
calibration constants namely R0, ALPHA, DELTA, C0, CG, and rCAL. These values
are set at the factory and must not be altered. The cor rect values are important to the
accuracy and proper and safe operation of the bath. Access to these parameters is
available to the user only so that in the event that the controller memory fails the user
may restore these values to the factory settings. The user should have a list of these
constants and their settings with manual.
Caution: DO NOT change the values of the bath calibration constants from the
factory set values. The correct setting of these parameters is im portant to the
safety and proper operation of the bath.
The calibration parameters menu is indicated by:
CAL
Calibration parameters menu
Press “SET” five times to enter the menu.
The calibration parameters R0, ALPHA, DELTA, C0, CG, and rCAL characterize the
resistance-temperature relationship of the platinum control sensor. These pa rameters
may be adjusted by an experienced user to improve the accuracy of the calibrator.
R0 9.12.1
This probe parameter refers to the resistance of the control probe at 0°C. The value of
this parameter is set at the factory for best instrument accuracy.
ALPHA 9.12.2
This probe parameter refers to the average sensitivity of the probe between 0 and
100°C. The value of this parameter is set at the factory for best instrument accuracy.
DELTA 9.12.3
This probe parameter characterizes the curvature of the resistance-temperature
relationship of the sensor. The value of this parameter is set at the factory for best
instrument accuracy.