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This Agilent G1311A quat pump has 4 solvent inlets and built in gradient control.
It also can be remotely controlled by external equipment.
The gradient formation is performed by a low pressure gradient valve.
Hydraulic system: Dual plunger in series pump with proprietary servo-controlled variable stroke drive, floating plungers and active inlet valve
Setable flow range: 0.001 - 10 ml/min, in 0.001 ml/min increments.
Flow range: 0.2 - 10.0 ml/min
Recommended pH range: 1.0 - 12.5, solvents with pH > 2.3 should not contain acids which attack stainless steel
Gradient formation: Low pressure quaternary mixing/gradient capability using proprietary high-speed proportioning valve. Delay volume 800 - 1100 μl, dependent on back pressure
Operating Voltage: 230 Volts AC.