Dionex ICS-1000 - Suppressor; DS6 Heated Conductivity Cell

2 • Features
Doc. 031879-01 3/03 2-27
2.4.6 Suppressor
The suppressor reduces the eluent conductivity and enhances the
conductivity of the sample ions, thereby increasing detection sensitivity.
Either an Atlas Electrolytic Suppressor, Self-Regenerating Suppressor, or
MicroMembrane Suppressor can be used with the ICS-1000.
For details about any of the suppressors or for information about selecting
a suppressor for your application, refer to the suppressor manuals. The
manuals are on the Dionex Reference Library CD-ROM (P/N 053891),
located in the ICS-1000 Ship Kit (P/N 057905).
2.4.7 DS6 Heated Conductivity Cell
The ICS-1000 flow-through conductivity cell measures the electrical
conductance of analyte ions as they pass through the cell. Two passivated
316 stainless steel electrodes are permanently sealed into the PEEK cell
body. The cell design provides efficient sweep-out, low volume (1
µL),
and low dispersion. Temperature control and compensation help ensure
good peak reproducibility and baseline stability.
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.
In ion analysis, the effect of temperature variation is minimized by
suppressing eluent conductivity. To further reduce the effect of
temperature variation, the ICS-1000 provides temperature control to the
cell. A heater inside the cell regulates the temperature. The cell heater can
be set to between 30 °C and 55 °C. The set temperature must be at least
7 °C above the ambient temperature. Setting the cell temperature to 0 °C
turns off the cell heater.
Temperature Compensation
Built-in preset temperature compensation of 1.7% per °C 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.