Agilent Technologies 1100 Series Instrukcja Obsługi Pobierz pdf (Strona 48)

38 1100 Series Capillary LC System Manual

2 Optimizing Performance

How to Choose the Primary Flow

Primary Flow is a parameter which exists only when the capillary pump is

used in the Micro mode. Primary flow is defined as the flow volume and

composition available at the inlet to the EMPV. Using this available primary

flow, the EMPV and flow sensor work together to deliver and control the

requested column flow. All primary flow in excess of the column flow is

delivered to waste via the 1/8 inch plastic waste tube connected to the EMPV

barbed waste fitting.

In every case, the pump automatically selects the best primary flow for the

requested column flow. This ensures optimum column flow stability under all

conditions. Primary flow selection is dependent on the current system

pressure, and on the existing pump configuration Therefore, it is important

that the pump configuration for filter volume and mixer volume is correct.

The user cannot request a specific primary flow value. However, one of three

available primary flow ranges can be selected by the user:

Default range (500-800 µl/min)

The default range is the best compromise between performance and solvent

savings.

Low Solvent Consumption range (200-500 µl/min)

Certain very long, shallow gradient analyses are possible in the low solvent

consumption range, but this range is best suited to isocratic analyses.

Selecting this range will result in minimum solvent consumption, but might

also result in poorer column flow performance.

NOTE

Primary flow always is much higher than column flow. This must be considered when

calculating the amount of solvent needed for unattended operation.

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Agilent Technologies 1100 Series Instrukcja Obsługi Strona 48