Hakko SFT-A3 Surface Tensiometer

Overview

The Hakko SFT-A3 Surface Tensiometer is an engineered solution for high-precision measurement of surface tension and interfacial tension in laboratory and quality control environments. Based on the fundamental principles of force tensiometry—specifically the Wilhelmy plate and du Noüy ring methods—the instrument quantifies the vertical force exerted on a calibrated platinum probe as it interacts with the liquid–air or liquid–liquid interface. These methods rely on classical capillary physics and are traceable to SI units via certified probe geometry and gravimetric calibration. The SFT-A3 is designed for reproducible, operator-independent measurements across diverse formulations including surfactant solutions, polymer melts, pharmaceutical emulsions, crude oil–water systems, and functional coatings. Its embedded WinCE platform enables standalone operation without dependency on external PCs, while maintaining full compliance with routine analytical workflows in GLP- and GMP-regulated settings.

Key Features

• High-resolution force transduction system with 0.01 mN/m resolution and certified accuracy of ±0.01 mN/m across the full 0–1000 mN/m range
• Motorized precision stage with 0–50 mm vertical travel, sub-micron repeatability (±0.5 µm), and programmable speed profiling for optimized meniscus detachment kinetics
• Integrated temperature sensor with ±0.01 °C accuracy and software-synchronized readout—critical for thermodynamic studies and temperature-dependent surfactant characterization
• 7-inch full-color WinCE touchscreen interface supporting real-time curve visualization, one-touch auto-zero, and intuitive navigation without external computing hardware
• Dual-method validation: simultaneous support for ISO 1409 (Wilhelmy plate) and ISO 304 (du Noüy ring), enabling method comparison and cross-laboratory data alignment
• Electronic meniscus detection algorithm that autonomously identifies the liquid level prior to force acquisition—eliminating manual baseline adjustment and reducing inter-operator variability
• USB 2.0 host port for direct export of raw and processed data to industry-standard formats compatible with OriginLab, Excel, and LIMS integration

Sample Compatibility & Compliance

The SFT-A3 accommodates a broad spectrum of sample types: aqueous and non-aqueous solutions, volatile organic solvents, viscous polymer dispersions, and multiphase interfaces (e.g., hydrocarbon–brine, silicone oil–water). Platinum plate and ring probes are supplied with certificate-of-calibration and comply with ASTM D971 and ISO 6295 for interfacial tension determination. All firmware and data handling routines adhere to ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) for audit readiness. While not FDA 21 CFR Part 11–certified out-of-the-box, the system supports electronic signature implementation and audit-trail-enabling configurations upon customer-specific validation protocols.

Software & Data Management

The proprietary Hakko Tensiometry Suite (v3.x) provides fully automated test sequencing—including immersion depth control, dwell time definition, dynamic withdrawal profiling, and automatic peak-force identification. Each measurement session generates timestamped metadata (operator ID, ambient temperature/humidity if logged externally, probe type, calibration date). Data is stored locally in a relational SQLite database with indexed query capability. Export options include tab-delimited ASCII for statistical analysis and native OriginLab (.opj) project files for advanced curve fitting (e.g., adsorption isotherms, diffusion-controlled relaxation modeling). Custom report templates can be configured to meet internal SOPs or regulatory submission requirements (e.g., ICH Q5C, USP ).

Applications

• Surfactant critical micelle concentration (CMC) determination via concentration–tension isotherms
• Emulsion and foam stability assessment through interfacial rheology proxies
• Quality assurance of cleaning agents, wetting agents, and coating additives in chemical manufacturing
• Crude oil–brine interfacial tension mapping for enhanced oil recovery (EOR) formulation screening
• Biopharmaceutical formulation development—monitoring protein–surfactant interactions at air–liquid interfaces
• Evaluation of nanomaterial dispersion stability via surface energy modulation analysis

FAQ

Does the SFT-A3 support both surface and interfacial tension measurements?
Yes—it is validated for both air–liquid surface tension and liquid–liquid interfacial tension using either platinum plate or ring geometry, with appropriate density correction applied for immiscible phase systems.
Is calibration traceable to national standards?
Platinum probes are supplied with individual calibration certificates referencing NIST-traceable mass standards; force transducer calibration follows ISO/IEC 17025–accredited procedures performed by Hakko’s metrology lab.
Can the instrument be integrated into a networked LIMS environment?
While the embedded OS operates offline, exported .csv and .opj files are structured for ingestion into common LIMS platforms via scheduled file transfer or middleware APIs.
What maintenance is required for long-term accuracy?
Annual verification of probe geometry (using optical profilometry), transducer linearity check with certified weights, and temperature sensor drift validation are recommended per ISO/IEC 17025 guidelines.
Is technical support available outside mainland China?
Hakko maintains authorized service partners in Germany, South Korea, and the United States; remote diagnostics and firmware updates are supported via secure HTTPS channel.