Column Thermostat Temperature Calibration - Agilent Technologies 1200 Series User Manual

6
Test Functions

Column Thermostat Temperature Calibration

Column Thermostat Temperature Calibration

Temperature Calibration Principle
The actual temperatures of the column heat exchangers (left and right) depend
on the column setpoint temperature. For setpoint temperatures above (36 °C),
the heat exchangers are heated to a temperature slightly above the setpoint
temperature. Conversely, for setpoint temperatures below (36 °C), the heat
exchangers are kept at a temperature slightly below the setpoint temperature.
This fine temperature correction compensates for the small amount of heat
exchange through the instrument housing, and ensures the column is always
kept at the setpoint temperature.
At (36 °C), the column setpoint and heat-exchanger temperatures are equal
(temperature cross-over point). This is the temperature at which a calibrated
measuring device can be used to calibrate the column thermostat.
Figure 20
66
1-Point Calibration at the Temperature Cross-Over Point
1200 Series TCC User Manual