PL-GPC 220 User Manual 93
Maintenance
7
Differential Refractive Index Detector
Differential Refractive Index Detector
The differential refractive index detector (DRI) is designed specifically for
high temperature chromatography giving an excellent signal to noise ratio
even at temperatures up to 220 °C. The light source and detectors are both
external to the oven and only the optical bench is heated and maintained at
the oven temperature.
In normal operation, very few problems are usual encountered with the DRI,
since the tubing and cell are continually washed with solvent. However, to
prevent contamination of the cell during the times when the system is not
operated, we recommend that the system is flushed and stored in acetone or
methanol. If the cell does become dirty, which will be manifested by a
reduction in the chromatography performance and typically small peaks, we
recommend the following sequence of maintenance to be carried out in order:
1 Purging the DRI Cell
2 Flushing the DRI Cell with a Cleaning Agent
3 Removal of the Cell and Replacement of Seals
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