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.
Damper and mixer can be bypassed for lowest delay volume of the binary pump. This configuration is recommended for low flow rate applications with steep gradients.
The hydraulic path of the Binary Pump with bypassed damper and mixer illustrates the flow path in low delay volume mode. For instructions on how to change between the two configurations, see Convert the Binary Pump to Low Delay Volume Mode.
NOTE
Bypassing the mixer while the damper remains in line is not a supported configuration and may lead to undesired behavior of the binary pump.
For pump specifications, see Physical specifications of the 1260 Infinity III Binary Pump (G7112B).
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