Agilent 1100 HPLC including DAD detector

The Agilent 1100 Series HPLC system configured with a Degasser, Quaternary Pump, Autosampler (ALS), Column Compartment, Diode Array Detector (DAD), and a dedicated PC with software, represents one of the most iconic and reliable modular analytical platforms in the history of liquid chromatography. Introduced by Agilent Technologies (formerly Hewlett-Packard), the 1100 series quickly became the industry standard for routine analysis, method development, and quality control across pharmaceuticals, environmental testing, food safety, and chemical research. This specific configuration leverages a low-pressure quaternary gradient system, where the G1322A Degasser removes dissolved gases from up to four solvent channels to prevent bubble formation and baseline noise. The G1311A Quaternary Pump then precisely mixes these solvents using a high-speed proportioning valve and delivers them at flow rates ranging from 0.001 to 10 mL/min with exceptional accuracy and minimal pulsation. This setup allows for complex multi-solvent gradients essential for separating a wide variety of compounds, from small organic molecules to complex natural products, without the need for manual solvent preparation or expensive high-pressure mixing valves.

The sample introduction and separation environment of this system are equally robust, beginning with the G1313A Autosampler (ALS), which offers precise injection volumes from 0.1 to 100 µL (extendable to 1500 µL) with high repeatability (typically <0.5% RSD). It accommodates standard trays holding 100 vials (2 mL) or 15 vials (6 mL), supporting sequential or random access injections, making it ideal for high-throughput workflows. Following injection, the mobile phase carries the sample into the G1316A Column Compartment, which maintains a stable temperature from 10°C below ambient up to 80°C (±0.15°C stability). Precise thermal control is critical here, as it ensures consistent retention times and sharp peak shapes, particularly for reproducible gradient separations. Finally, the eluting compounds pass through the G1315A Diode Array Detector (DAD), which captures full-spectrum UV/Vis data from 190 to 950 nm. Unlike standard fixed-wavelength detectors, the DAD stores a complete absorption spectrum for every data point, enabling powerful post-run analysis such as peak purity checks, co-elution detection, and the selection of optimal quantification wavelengths, all of which are essential for validating analytical methods in regulated environments.

Completing the system is a connected PC running Agilent’s ChemStation or OpenLAB CDS software, which provides comprehensive instrument control, data acquisition, and compliance-ready data management. The software interface allows users to create complex sequences, monitor system pressures and signals in real-time, and generate detailed reports with integrated audit trails and electronic signatures, aligning with FDA 21 CFR Part 11 and GLP/GMP requirements. This entire stackable, space-efficient module arrangement revolutionized laboratory workflows by combining durability with intelligent diagnostics, such as Early Maintenance Feedback (EMF) that alerts users to impending part wear (e.g., seals or lamps). Decades after its launch, the Agilent 1100 HPLC system remains highly sought after, particularly in refurbished markets, due to its mechanical simplicity, vast global service support, and unmatched track record for delivering consistent, high-quality chromatographic results. It stands as a testament to foundational engineering that prioritizes long-term laboratory productivity and data integrity.