Waters 590 Programmable Solvent Delivery Pump

Overview

The Waters 590 Programmable Solvent Delivery Pump is a high-precision, microprocessor-controlled isocratic and gradient-capable liquid chromatography pump engineered for robust performance in analytical and preparative HPLC systems. Designed and manufactured by Waters Corporation in Mississauga, Ontario, Canada, the 590 integrates dual-piston reciprocating architecture with real-time electronic pressure monitoring and adaptive solvent compressibility compensation—enabling stable, pulse-free flow delivery across a wide operational pressure range (up to 6000 psi). Its core function is precise mobile phase delivery under programmable flow-rate profiles, making it suitable as a standalone pump or as a component within legacy Waters Alliance and Delta system configurations. While discontinued from new production, the 590 remains widely deployed in regulated QC laboratories, academic research facilities, and contract testing organizations due to its mechanical durability, serviceability, and documented compliance history with GLP and GMP workflows.

Key Features

• Dual-piston positive displacement design with ceramic-coated plungers and sapphire seals for extended service life and chemical resistance
• Programmable flow rate from 0.001 to 20.00 mL/min in 0.001 mL/min increments; expandable to 45 mL/min using optional high-flow head assembly
• Up to 40-step flow-rate gradient methods stored internally, supporting complex elution profiles without external controller dependency
• Digital compressibility compensation—user-adjustable parameter that dynamically corrects for solvent density and compressibility changes at elevated backpressures
• Integrated pressure sensor with real-time analog output (0–10 V) and over-pressure shutdown protection (configurable threshold)
• Front-panel keypad and LED display for local manual operation; RS-232 serial interface for remote control via legacy chromatography data systems (CDS) or custom LabVIEW/Python scripts
• Compatible with standard 1/4-28 UNF inlet/outlet fittings and stainless-steel or PEEK fluidic paths

Sample Compatibility & Compliance

The Waters 590 supports aqueous, organic, and mixed mobile phases—including acetonitrile, methanol, tetrahydrofuran, and buffered salt solutions—provided they are filtered (≤0.45 µm) and degassed. It is routinely validated for use with reversed-phase, ion-exchange, and size-exclusion chromatography columns (ID 2.1–21.2 mm, lengths up to 250 mm). Though not certified to current FDA 21 CFR Part 11 out-of-the-box, the pump’s deterministic behavior, audit-ready method storage, and pressure trace logging (when paired with compatible CDS) support retrospective validation under ISO/IEC 17025, USP , and ASTM E2500-13 frameworks. All refurbished units undergo full functional verification per Waters Service Bulletin SB-590-02, including leak testing, flow accuracy calibration (±1.5% RSD at 1 mL/min), and pressure stability assessment (<0.5% ripple at 2000 psi).

Software & Data Management

The 590 operates autonomously via front-panel programming or integrates with legacy Waters Millennium32, Empower 1/2, or third-party CDS platforms via ASCII command protocol (e.g., “FLOW=1.500”, “PRESSURE?”, “START”). No proprietary driver installation is required—standard terminal emulation (e.g., Tera Term) enables direct command-line interaction. Method files (.MTH) are stored in non-volatile RAM and retain settings after power cycling. For modern lab informatics integration, optional RS-232-to-USB adapters and Python-based drivers (available via open-source repositories such as PyChrom) allow automated method loading, real-time pressure streaming, and event-triggered logging—facilitating alignment with ALCOA+ data integrity principles when combined with timestamped audit trails.

Applications

• Method development and transfer of pharmacopeial assays (USP , EP 2.2.46) requiring precise isocratic hold or shallow gradients
• Preparative fraction collection where reproducible flow-driven volume triggering is critical
• Calibration of mass flow meters and reference standard delivery in metrology labs
• Teaching chromatography fundamentals in university analytical chemistry laboratories
• Backup or redundancy pumping in multi-pump HPLC systems operating under 4000 psi
• Mobile phase delivery in coupled techniques such as LC-FTIR or LC-UV kinetic studies

FAQ

Is the Waters 590 compatible with modern Empower 3 or Chromeleon software?
No native driver exists; however, serial command emulation via third-party middleware (e.g., Waters Bridge Utility or custom OPC-UA gateway) enables basic start/stop and flow setpoint control.
What maintenance is recommended prior to commissioning a refurbished unit?
Replace inlet/outlet check valves, piston seals, and purge valve filter; recalibrate flow rate using gravimetric NIST-traceable methodology per ASTM D7215.
Does the 6-month warranty cover parts and labor globally?
Yes—warranty includes onsite or depot-level technical support and replacement of defective components, excluding consumables and damage from improper solvent use or pressure overloads.
Can the 590 perform gradient elution without a separate low-pressure mixing module?
No—it is a single-channel isocratic pump; gradient capability requires external low-pressure or high-pressure mixing (e.g., Waters 600E controller + 510 pumps or third-party quaternary modules).
Are spare parts still available for long-term support?
Yes—Waters continues to supply OEM parts (P/Ns ending in -590), and aftermarket seal kits and flow cells are stocked by certified distributors worldwide.