Agilent Technologies Agilent 1260 Infinity System User's Manual page 11

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The Agilent 1260 Infinity Binary LC - Product Description
System Components
1260 Infinity Binary Pump (G1312B)
The binary pump comprises two identical pumps integrated into one
housing. Binary gradients are created by high- pressure mixing. Pulse
damper and mixer can be bypassed for low flowrate applications or
whenever a minimal transient volume is desirable. Typical applications are
high throughput methods with fast gradients on high resolution 2.1 mm
columns. The pump is capable of delivering flow in the range of 0.1 –
5 mL/min against up to 600 bar. A solvent selection valve (optional)
allows to form binary mixtures (isocratic or gradient) from one of two
solvents per channel. Active seal wash (optional) is available for use with
concentrated buffer solutions.
Principle of operation
The binary pump is based on a two- channel, dual- piston in- series design
which comprises all essential functions that a solvent delivery system has
to fulfill. Metering of solvent and delivery to the high- pressure side are
performed by two pump assemblies which can generate pressure up to
600 bar.
Each channel comprises a pump assembly including pump drive, pump
head, active inlet valve with replaceable cartridge, and outlet valve. The
two channels are fed into a low- volume mixing chamber which is
connected via a restriction capillary coil to a damping unit and a mixer. A
pressure sensor monitors the pump pressure. A purge valve with
integrated PTFE frit is fitted to the pump outlet for convenient priming of
the pumping system.
1260 Infinity Binary LC - System User Guide 11