USED AGILENT TECHNOLOGIES G1311A

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 1200 Series G1311A quaternary pump with warranty coverage.
Every unit 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 pump
Agilent engineered the 1200 Series Quaternary Pump to serve as the ultimate flexibility engine for routine pharmaceutical, environmental, and food safety testing. Agilent highlights this module for its integrated low-pressure proportioning valve (quaternary valve block), which allows automated online mixing of up to four distinct solvents at a time. Utilizing a specialized series-connected, dual-floating piston mechanism with electronic stroke control, it actively compensates for solvent compressibility to maintain exceptionally smooth, pulse-free flow profiles. It stands as the industry-standard choice for laboratories that require rapid method development capabilities, convenient system flushing protocols, and reliable gradient execution without the capital expense of multiple standalone pumps.
What this module does
Quaternary pumping
As a standalone quaternary liquid chromatography pump, the Agilent G1311A manages the critical task of complex mobile phase blending and high-pressure fluidic delivery:
Four-Solvent Multi-Blending: It controls an internal low-pressure proportioning valve to precisely meter and mix up to four separate solvents simultaneously, enabling complex quaternary gradients or automated column flushing routines.
High-Pressure Gradient Injection: It pumps the blended mobile phase mixture through a dual-piston assembly at operating thresholds up to 400 bar, ensuring crisp peak shapes and highly reproducible retention times.
Continuous Active Seal Washing: It features a dedicated low-pressure rinse pathway that continuously flushes the rear of the pump pistons, physically preventing salt crystallization from buffer options to preserve the life of the high-pressure seals.
Seamless Modular Communication: It uses integrated CAN and LAN connections to sync seamlessly with autosamplers, column ovens, and optical detectors, establishing a unified hardware profile under standard chromatography data software.
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
Because a quaternary pump can dynamically shift solvent concentrations during a run, it is the classic choice for complex multi-residue screenings, exploratory methods development, and routine testing labs that change mobile phases frequently.  These are the application areas buyers ask about most.
Multi-Component Impurity Screening and Method Development
The Agilent G1311A enables chemists to efficiently screen mobile phase ratios and buffer modifiers using four solvent channels. Its automated online blending eliminates manual mixing, accelerates method development and validation, and provides precise gradient control for reliable impurity testing and compliance assays.
Multi-Residue Pesticide and Herbicide Screening
The Agilent G1311A delivers precise gradient blending for analyzing agricultural contaminants in water, soil, and wastewater samples. Its flexible solvent control supports effective separation of polar compounds, pesticides, and herbicides while maintaining reliable results and cost-efficient laboratory operations.
Multi-Component Nutrition, Additive, and Preservative Profiling
The Agilent G1311A provides precise gradient control to separate vitamins, sweeteners, organic acids, and food dyes in complex samples. Its four-solvent configuration supports automated column flushing and flexible mobile phase selection, reducing manual preparation, minimizing downtime, and improving laboratory efficiency.
Automated Potency and Terpene Profiling
The Agilent 1200 Quaternary Pump supports cannabinoid analysis with precise gradient control and effective column cleaning. Its four-solvent configuration accommodates analytical, wash, and flush solutions, helping remove residual plant oils, reduce downtime, and maintain efficient, high-throughput testing.
Complex Toxicology Panels and Seizure Analysis
The Agilent 1200 Quaternary Pump provides precise gradient control to separate drugs, metabolites, and adulterants in complex samples. Its flexible solvent blending supports effective separation of polar and hydrophobic compounds, delivering reproducible chromatographic results for reliable toxicology screening and forensic analysis.
Additional Information
Documentation
Financing

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[In this listing]
Agilent 1200 Quaternary Pump G1311A with CAN Cable: Verified
Warranty Coverage Extended Options Available: Included
[Each module is individually serialized and performance-verified before the stack is assembled and tested as a complete system.]
Hydraulic System: Dual-piston in series with floating pistons and electronic stroke volume control
Gradient Formation: Low-pressure quaternary mixing/proportioning valve block
Number of Solvents: Up to 4 channels simultaneously
Flow Range: Setpoints from 0.001 to 10.0 mL/min (recommended analytical range: 0.2 to 5.0 mL/min)
Flow Precision: < 0.3% RSD (typically < 0.15% RSD based on retention time reproducibility)
Flow Accuracy: ± 1% or 10 µL/min (whichever is greater)
Maximum Operating Pressure: Up to 400 bar (5,880 psi) operating threshold
Composition Range/td>: 0 to 100% in 0.1% increments from all 4 channels
Composition Precision: < 0.5% absolute or < 0.15% RSD at 1 mL/min
Pressure Pulsation: < 2% amplitude (typically < 1% with water at 1 mL/min and pressure > 40 bar)
Software Control: Agilent ChemStation, OpenLab, MassHunter, or Waters Empower via Agilent ICF
Weight: 33 lbs
Dimensions: 24 × 24 × 24 in
Condition: Refurbished
Model: G1311A
OEM: Agilent Technologies
Financing: Financing Options Available