Hamilton PSD/3 Precision Syringe Pump

Overview

The Hamilton PSD/3 is a high-precision, microprocessor-controlled syringe pump engineered for reproducible, low-volume fluid delivery in analytical, pharmaceutical, and life science applications. Unlike peristaltic or diaphragm-based pumps, the PSD/3 employs a closed-loop DC servo-driven linear actuator coupled with Hamilton’s proprietary GASTIGHT® half-height syringe platform—enabling accurate displacement control via direct plunger positioning rather than pressure or flow rate inference. Its design adheres to core principles of volumetric dosing: displacement accuracy is determined by mechanical resolution, syringe geometry, and thermal stability—not inferred from downstream sensors. This makes the PSD/3 particularly suited for applications demanding trace-level repeatability, such as HPLC sample injection, microfluidic actuation, automated assay dispensing, and controlled reagent addition in kinetic studies.

Key Features

• True closed-loop position control using an encoder-equipped DC servo motor and wear-compensating lead screw assembly—eliminating drift and backlash without lubrication.
• Configurable resolution up to 30,000 steps over 30 mm stroke, supporting both coarse priming and fine incremental dispensing within a single method.
• Full compatibility with Hamilton GASTIGHT® half-height syringes (12.5 µL to 12.5 mL), ensuring gas-tight performance and chemical resistance across aggressive solvents including DMSO, acetonitrile, and concentrated acids/bases.
• Modular HV plug valves with PTFE/CTFE wetted surfaces and snap-in/out cartridge design—supporting rapid reconfiguration between 2-, 4-, 6-, or 24-position configurations (in 15° increments).
• Onboard FLASH memory stores user-defined methods, including multi-step sequences with independent delays, prime cycles, backlash compensation, and real-time speed modulation.
• RS-232C interface compliant with Hamilton Reno Protocol 1 and Bonaduz DIN Protocol, enabling seamless integration into LabVIEW, MATLAB, or custom SCADA environments; supports daisy-chaining of up to 16 units on a single serial bus.
• Industrial-grade environmental tolerance: operational range of 15–35°C and 20–90% non-condensing humidity ensures stable performance in shared lab spaces and QC environments subject to HVAC fluctuations.

Sample Compatibility & Compliance

The PSD/3 maintains fluid integrity through chemically inert wetted materials—borosilicate glass barrels, PTFE/CTFE seals, and fluoropolymer tubing—validated per USP Class VI and ISO 10993-5 cytotoxicity standards. Its syringe mounting system prevents axial misalignment, minimizing shear-induced degradation of sensitive biologics (e.g., proteins, viral vectors, or liposomal suspensions). While not inherently 21 CFR Part 11-compliant as a standalone device, the pump supports audit-trail-capable host software when paired with validated control systems meeting GLP/GMP data integrity requirements. It conforms to IEC 61000-6-2 (immunity) and IEC 61000-6-3 (emissions) for electromagnetic compatibility in regulated laboratory settings.

Software & Data Management

The PSD/3 operates autonomously via stored FLASH methods but is fully controllable via ASCII command sets transmitted over RS-232. Host software can initiate, pause, resume, or abort sequences while querying real-time status (position, valve state, error flags). All programmable parameters—including syringe-specific calibration offsets, backlash correction values, and valve dwell times—are retained across power cycles. The auxiliary TTL input enables hardware-triggered execution (e.g., synchronization with spectrometer acquisition or fraction collector signals), and the dedicated TTL I/O port supports external event signaling. Firmware updates are performed in-system via serial interface, preserving configuration integrity during revision upgrades.

Applications

• HPLC and UHPLC autosampler integration for precise loop fill and injection volume control.
• Automated liquid handling in ELISA, qPCR setup, and cell culture media exchange protocols requiring sub-microliter accuracy.
• Controlled reagent infusion in stopped-flow kinetics, electrochemical analysis, and reaction calorimetry.
• Microfluidic chip priming and pressure-balanced flow generation in organ-on-chip platforms.
• Calibration standard delivery for gravimetric or photometric verification of analytical instrumentation.
• Process development support in API synthesis where stoichiometric addition timing and volume fidelity directly impact impurity profiles.

FAQ

What syringes are compatible with the PSD/3?
Only Hamilton GASTIGHT® half-height instrument syringes (catalog numbers ending in “-HH”) are mechanically and dimensionally supported—ranging from 12.5 µL to 12.5 mL. Standard full-height syringes or third-party models are not accommodated.
Can the PSD/3 be used in sterile or cleanroom environments?
Yes—the absence of internal lubricants, sealed electronics enclosure, and non-shedding fluoropolymer components meet ISO 14644-1 Class 7 (10,000) particulate requirements when operated with appropriate gowning and surface decontamination protocols.
Is firmware upgrade capability available in the field?
Yes—firmware revisions are delivered as HEX files and loaded via RS-232 using Hamilton’s standard update utility; no hardware modification or service visit is required.
How is accuracy verified across different syringe sizes?
Accuracy specifications are syringe-dependent and reflect combined contributions from mechanical resolution, plunger seal friction, and thermal expansion of glass barrels; Hamilton provides individual syringe calibration certificates upon request for GxP-critical deployments.
Does the PSD/3 support analog input for external flow feedback?
No—the PSD/3 is a displacement-controlled device and does not accept analog flow or pressure feedback signals; closed-loop operation is strictly positional, not flow-regulated.