ICS-3000 Ion Chromatography System
54 Doc. 065031-04 1/08
Temperature Control
Temperature directly affects the conductivity of a solution. For example,
laboratory heating and air conditioning systems can cause a regular slow
cycling in the baseline. This, in turn, can affect the reproducibility of an
analysis. The higher the conductivity, the more pronounced the effect.
To reduce the effect of temperature variation, the DC provides
temperature control of both the DC compartment and the cell. A heater
inside the cell regulates the cell temperature. The cell heater temperature
range is from a low of 5 °C above the temperature of the middle and
upper compartment to a high of 60 °C.
Temperature Compensation
Built-in temperature compensation helps minimize changes in the
baseline or in peak heights if the operating temperature is different from
the temperature at which the cell was calibrated. The default temperature
compensation is 1.7% per °C. This can be reset to between 0% and 3.0%
per °C, depending on the eluent. If you notice that the baseline shifts up
when the temperature increases, the compensation factor is too low and
should be reset to a higher value.
Follow these steps to change the temperature compensation factor:
1. In Chromeleon or Chromeleon Xpress, select Command on the
Control menu or press the F8 key.
2. In the Commands dialog box, select the conductivity detector.
3. Select the Temperature_Compensation command and enter the
desired value.
4. Click Execute.
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