The EcoSEC GPC system contains two independently operating pumps. The main pump delivers solvent to the column. An identical secondary pump delivers the same solvent via a 'reference column' to the reference cell of the refractive index detector.
The primary benefit derived from the second pump is an improvement of RI baseline stability. Controlling the temperature of the pump housing and tubing further improves baseline stability by removing the effect of temperature fluctuations on solvent delivery.
As an added benefit, the secondary pump may also be used in a column switching mode (optional) to allow for a quick change-over from, for instance, a high MW column to a low MW column.
All components shown in the picture can be maintained at a constant temperature within the range of ambient plus 10oC to 50oC upon closing the cover door (left).
The following performance data apply to each pumping unit:
- Flow rate -- 10 to 2,000µL/min
- Accuracy -- +/- 2%
- Precision -- +/- 0.2%
- Max. pressure -- 25MPa (~250 bar, ~3500psi)
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