USED AGILENT TECHNOLOGIES G1311B

15-Day
Refurbishment cadence
OEM-Spec
Verified against OEM and published benchmarks; report included.
On-Staff
Solution Scientists
Since 1996
Three decades supporting labs
What you are buying
A refurbished Agilent 1260 Infinity G1311B Quaternary Pump, with warranty coverage.
Every unit we sell moves through the GenTech Certified process. Solution Scientists disassemble and inspect each module, replace all consumables and degraded wear components, then tune and calibrate the instrument and verify performance against OEM and published benchmarks using known reference chemicals. The instrument ships with its verification report. A certified-refurbished system gives you that performance without the capital cost or the lead time of a new purchase.
What Agilent says about this platform
Agilent designed the 1260 Infinity Quaternary Pump to serve as the ideal choice for routine pharmaceutical, environmental, and food analysis methods that require maximum method flexibility. Agilent highlights this module for its low-pressure mixing architecture, which utilizes a proprietary high-speed proportioning valve to blend up to four individual solvent channels within a single pump assembly. Operating at pressures up to 600 bar, the G1311B enables laboratories to utilize smaller particle size columns for higher resolutions and faster separations without sacrificing hydraulic safety margins. It stands as an economical, low-maintenance workhorse featuring a built-in high-efficiency vacuum degasser and an automated variable stroke drive that maintains stable, virtually pulse-free solvent flow across standard analytical and semi-preparative flow domains
What this module does
Quaternary pumping
Rather than relying on multiple separate high-pressure pumps, the Agilent G1311B operates as a centralized low-pressure gradient blending module within a High-Performance Liquid Chromatography (HPLC / UHPLC) stack. Positioned directly at the beginning of the system flow path, its primary job is to smoothly draw from up to four mobile phase bottles, degas them, and deliver precise solvent compositions to the column. This process executes several critical system-wide functions:
Multi-Solvent Gradient Generation: It coordinates a high-speed multi-channel proportioning valve to execute complex quaternary gradients or rapidly switch between distinct isocratic mobile phases for automated method development.
Integrated Inline Degassing: It routes incoming solvents through a built-in 4-channel vacuum degasser to strip away dissolved gases, eliminating baseline noise on downstream optical detectors.
Variable Stroke Optimization: It employs a dual-piston in-series design that automatically modifies its piston stroke length based on the current flow velocity, eliminating pressure pulsations.
Active Hardware Protection: It integrates a dynamic microprocessor control loop that actively monitors system backpressures and can run an optional piston seal-wash mechanism to protect internal check valves from abrasive salt buffers.
Technical detail
*OEM specifications for brand new instrument.
What “GenTech Certified” means
Refurbishment at GenTech is a defined process, not a wipe-down. Every system moves through the same specific stages.
1. Disassembly and rebuild. Solution Scientists strip the instrument down, clean each module inside and out, and rebuild it from the frame up. They replace pump seals, pistons, and check valves to specification.
2. Configuration and new parts. Solution Scientists install the options and modules you selected and fit new wear parts throughout. They replace the detector lamp with a new one and reset the lamp hours.
3. Diagnostic and performance testing. Solution Scientists tune and calibrate the instrument, run system diagnostics, and confirm detector wavelength accuracy. They test full-system pressure and gradient performance against OEM and published benchmarks using known reference chemicals.
4. Delivery and installation. The instrument ships in protective packing with a one-year warranty option and professional installation available from a GenTech Solution Scientist.
Labs that run this system
The 1260 HPLC is method-compatible across the techniques most regulated and research labs run every day. These are the application areas buyers ask about most.
Flexible Method Development and Routine QC
Pharma discovery groups utilize the G1311B to rapidly screen different mobile phase pH steps and buffer combinations using a single method file. Four-solvent flexibility speeds up method scouting workflows while maintaining strict baseline reproducibility for routine batch release testing.
Automated Gradient Extraction of Target Trace Pesticides
Environmental labs deploy this quaternary pump to isolate heavily retained contaminants from complex water and soil matrices. Blending multi-solvent gradients directly at the pump eliminates system downtime, speeding up long automated regulatory sequences.
Reliable Profiling of Complex Carbohydrates and Additives
Food safety facilities rely on the G1311B to execute complex solvent ramp steps required to isolate vitamins and organic acids. The built-in 4-channel degasser prevents outgassing, ensuring stable baseline measurements during trace allergen assays
Continuous Multi-Solvent Column Flushing and Potency Runs
High-volume cannabis laboratories use this flexible module to alternate between active cannabinoid potency analysis gradients and aggressive column-cleaning solvent steps. Automating the flush lines cuts manual labor and ensures clean baselines across consecutive injections.
Rapid Quaternary Ramps for Diverse Seized Materials
Crime laboratories apply this low-pressure mixing pump to handle unexpected forensic casework profiles without reconfiguring fluid lines. The ability to access four independent solvent reservoirs allows automated method transitions when identifying cutting agents and illicit compounds.
Additional Information
Documentation
Financing

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Need another single module instead?
Replacing a failed pump or expanding an existing stack? Shop our inventory of performance-verified 1260 modules and HPLC upgrades.
[In this listing]
Agilent 1260 Infinity Quaternary Pump G1311B: Verified
Waranty Coverage Extended Options Available: Included
[Each module is individually serialized and performance-verified before the stack is assembled and tested as a complete system.]
Flow Range: 0.2 – 10.0 mL/min (Operating); set points down to 0.001 mL/min
Maximum Pressure: Up to 600 bar (up to 5.0 mL/min); Up to 200 bar (at 10.0 mL/min)
Gradient Formation: Low-pressure quaternary mixing via high-speed proportioning valve
Flow precision: ≤ 0.07% RSD or ≤ 0.02 min SD (whichever is greater)
Composition Precision: < 0.2% RSD or < 0.04 min SD at 1.0 mL/min
Integrated Degasser: 4 channels; 1.5 mL internal volume per channel
pH Operating Range: 1.0 – 12.5 (avoiding strong steel-attacking acids below pH 2.3)
Weight: 25 lbs
Dimensions: 24 × 24 × 24 in
Condition: Refurbished
Model: G1311B
OEM: Agilent Technologies
Financing: Financing Options Available