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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 24
The column thermostat is calibrated correctly when the measured
temperature (using the external measuring device,
Procedure"
exchangers (left and right) are within a range of ± 0.5 °C.
1290 Infinity TCC User Manual
1-Point Calibration at the Temperature Cross-Over Point
on page 108) and the cross-over temperature (36 °C) of both heat
Test Functions and Calibrations
Temperature Calibration
"Temperature Calibration
7
107
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