2-14
Preparing System Hardware
Priming the sample manager
During the priming process the sample needle fills with solvent, the solvent
changes, and/or air is purged from the lines. You prime the sample needle
and/or sample syringe to accomplish these tasks:
•
Prepare the sample manager for operation
•
Rinse the internal needle, the external piercing needle, and the injection
port
•
Remove bubbles from the lines
Guidelines:
Ensure that the priming solvent is correctly composed and that it
is high in quality and miscible with the other solvents. Use filters in all
solvent reservoirs. Ensure the volumes of solvents are sufficient for priming.
Caution:
Allow the priming sequence to finish. Stopping the priming sequence
can leave strong solvent in the needle, which can affect the chromatography.
Requirement:
The sample manager must be primed before you attempt to
characterize the seal.
Sample diluent
The weak wash solvent can contact the sample, so match
the weak wash solvent and sample matrix as closely as
possible.
To offset adverse effects on peak shape caused by the
matrix’s composition, adjust the weak wash composition
when using the module in partial loop mode.
Wash volume
ratio (weak to
strong)
Within a method, this should be about 3:1, weak wash to
strong wash, sufficient to ensure the weak wash flushes
the strong from the needle and sample loop.
Cycle times
Higher viscosity wash solvents lengthen wash cycles. For
high-throughput work (cycle times < 1 min), adjust cycle
times accordingly to accommodate the longer wash cycles.
Wash solvent effects: (Continued)
Property
Effect
Summary of Contents for nanoACQUITY UPLC
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