Agilent 1100 Series G1311A QuatPump HPLC Quaternary Pump Made in Germany, Tested

Description

Agilent 1100 Series G1311A QuatPump HPLC Quaternary Pump Made in Germany, Tested
Features
Ease-of-use
– handheld control module lets you enter operating parameters fast, store methods easily and display pressure profile, diagnostics and task-oriented information.
Durable
– stainless steel, titanium, gold, ruby, sapphire, ceramics, PEEK and PTFE ensure long lifetime. Seal wash option for high salt mobile phases keeps maintenance to a minimum for lower operation costs.
Wide flow range
– up to 10 ml/min for broad HPLC work, including semi-preparative separations.
Better for GLP
– built-in leak and pressure test with graphical presentation of pressure profiles, and early maintenance feedback.
The HP Agilent 1100 Series G1311A ( G1311 A / G 1311 A / G 1311A ) Pump is a component in the 1100 HPLC series. It ensures virtually pulse-free and stable solvent flow, with dual floating pistons in series, precisely servo-controlled. This design with variable stroke volume allows pulse-free solvent delivery and efficient mixing. An inlet-valve electronically activated and synchronized to piston stroke eliminates vapor formation with volatile solvents and is maintenance free. With high-speed proportioning valve and pre-configured vacuum degasser, for convenient low-pressure mixing of up to four solvents and highest flexibility in solvent choices.
The Agilent 1100 Series is one of the most rugged and durable liquid chromatograph systems on the market today.  The G1311A is an optimized design ensuring virtually pulse-free and stable solvent flow with dual floating pistions.   Instrument comes equipped with four solvent inlets with built-in gradient control.  The gradient formation is performed by a low pressure gradient valve.
Description
The quaternary pump comprises a solvent cabinet, a vacuum degasser and a four-channel gradient pump. The four-channel gradient pump comprises a high-speed proportioning valve and a pump assembly. It provides gradient generation by low pressure mixing. Degassing is a must for a low-pressure gradient system therefore the Agilent 1100 Series vacuum degasser is part of the quaternary pump system. A solvent cabinet provides enough space for four one-liter bottles. A continuous seal wash (optional) is available when the quaternary pump is used with concentrated buffer solutions.
The quaternary pump is based on a two-channel, dual plunger 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 one pump assembly which can generate pressure up to 400 bar. Degassing of the solvents is done in a vacuum degasser and solvent compositions are generated on the low-pressure side by a high-speed proportioning valve.
The pump assembly includes a pump head with an active inlet valve which has an replaceable cartridge, and an outlet valve. A damping unit is connected between the two plunger chambers. A purge valve including a PTFE frit is fitted at the pump outlet for convenient priming of the pump head.
A continuous seal wash (optional) is available when the quaternary pump is used with concentrated buffer solutions.
How does the Pump Work?
The liquid runs from the solvent reservoir through the degasser to the MCGV and from there to the active inlet valve. The pump assembly comprises two substantially identical plunger/chamber units. Both plunger/chamber units comprise a ball-screw drive and a pump head with one sapphire plunger for reciprocating movement in it.
A servo-controlled variable reluctance motor drives the two ball-screw drives in opposite directions. The gears for the ball-screw drives have different circumferences (ratio 2:1) allowing the first plunger to move at twice the speed of the second plunger. The solvent enters the pump head close to the bottom limit and leaves it at its top. The outer diameter of the plunger is smaller than the inner diameter of the pump head chamber allowing the solvent to fill the gap in between. The first plunger has a stroke volume in the range of 20–100 µl depending on the flow rate. The microprocessor controls all flow rates in a range of 1 µl–10 ml/min. The inlet of the first plunger/chamber unit is connected to the active inlet valve which is processor-controlled opened or closed allowing solvent to be drawn into the first plunger pump unit.
The outlet of the first plunger/chamber unit is connected through the outlet ball valve and the damping unit to the inlet of the second plunger/chamber unit. The outlet of the purge valve assembly is then connected to the following chromatographic system.
When turned on, the quaternary pump runs through an initialization procedure to determine the upper dead center of the first plunger. The first plunger moves slowly upwards into the mechanical stop of chamber and from there it moves back a predetermined path length. The controller stores this plunger position in memory. After this initialization the quaternary pump starts operation with the set parameters. The active inlet valve is opened and the down-moving plunger draws solvent into the first chamber. At the same time the second plunger is moving upwards delivering into the system. After a controller-defined stroke length (depending on the flow rate) the drive motor is stopped and the active inlet valve is closed. The motor direction is reversed and moves the first plunger up until it reaches the stored upper limit and at the same time moving the second plunger downwards. Then the sequence starts again moving the plungers up and down between the two limits. During the up movement of the first plunger the solvent in the chamber is pressed through the outlet ball valve into the second chamber. The second plunger draws in half of the volume displaced by the first plunger and the remaining half volume is directly delivered into the system. During the drawing stroke of the first plunger, the second plunger delivers the drawn volume into the system.
For solvent compositions from the solvent bottles A, B, C, D the controller divides the length of the intake stroke in certain fractions in which the gradient valve connects the specified solvent channel to the pump input.
Specifications
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
Flow precision < 0.3 % RSD (typically 0.15 %), based on retention time, at 1 ml/min
Pressure
Operating range 0 – 40 MPa (0 – 400 bar, 0 – 5880 psi) up to 5 ml/min
Operating range 0 – 20 MPa (0 – 200 bar, 0 – 2950 psi) up to 10 ml/min
Pressure pulsation < 2 %amplitude (typically < 1 %), at 1 ml/min isopropanol, at all pressures > 1 MPa (10bar)
Compressibility compensation: User-selectable, based on mobile phase compressibility
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
Composition Range 0 – 95 % or 5 – 100 %, user selectable
Composition Precision < 0.2 % SD, at 0.2 and 1 ml/min
Control and data evaluation: Agilent ChemStation for LC
Analog output For pressure monitoring, 2 mV/bar, one output
Communications Controller-area network (CAN), GPIB, RS-232C, APG Remote: ready, start,
stop and shut-down signals, LAN optional
Condition:
Attentively used government surplus item.
Tested to power on, not available to test further.
Picked up from a discontinuing facility in working condition.
Photos represent the exact item that will be shipped. Please refer the photos.
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