ATAGO NAR-2T LO Benchtop High-Precision Digital Abbe Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | NAR-2T LO |
| Product Type | Benchtop Refractometer |
| Temperature Control | Yes |
| Digital Display | Yes |
| Refractive Index Range | 1.1500–1.4800 |
| Measurement Accuracy | ±0.0002 |
Overview
The ATAGO NAR-2T LO is a benchtop high-precision digital Abbe refractometer engineered for rigorous optical measurement of refractive index (nD) across a broad, low-to-mid range—specifically optimized for samples with inherently low refractive indices, such as hydrocarbon solvents, silicone oils, fluorinated fluids, and thin polymer films. Based on the classical Abbe principle—utilizing collimated sodium D-line illumination (589.3 nm) and critical angle detection via a precision-ground glass prism—the instrument delivers traceable, repeatable measurements compliant with ISO 21748, ASTM D1218, and JIS K 0061 standards. Its thermally stabilized optical path and integrated Peltier temperature control (±0.1 °C regulation) ensure measurement stability under variable ambient conditions, eliminating thermal drift that compromises accuracy in conventional analog refractometers.
Key Features
- Peltier-based active temperature control (range: 10–50 °C, adjustable in 0.1 °C increments) with real-time sensor feedback and auto-compensation to nD(20 °C)
- Digital high-resolution LCD display showing refractive index (nD) to four decimal places (e.g., 1.3427), with simultaneous temperature readout in °C
- Optimized optical design featuring a high-transmittance Abbe prism (BK7 glass) and LED-based D-line simulation for long-term spectral stability and zero warm-up delay
- Compact, vibration-damped chassis with ergonomic sample stage and integrated prism cleaning port for rapid solvent residue removal
- Auto-zero function and built-in calibration verification using certified reference standards (e.g., distilled water, nD = 1.3330 at 20 °C)
- Compliance-ready architecture supporting GLP documentation: timestamped measurement logs, operator ID entry, and audit trail export via optional RS-232/USB interface
Sample Compatibility & Compliance
The NAR-2T LO accommodates liquid, semi-liquid, and thin-film samples requiring minimal volume (≥0.1 mL) and no dilution. Its extended lower limit (nD = 1.1500) enables accurate characterization of volatile organic compounds (VOCs), refrigerants (e.g., R-134a, R-1234yf), perfluoropolyethers (PFPEs), and low-index adhesives—materials often underserved by standard refractometers. All optical components meet ISO 10110 surface quality specifications; prism coating is anti-scratch and chemically resistant to common solvents including acetone, hexane, and ethanol. The device conforms to IEC 61010-1 for laboratory electrical safety and carries CE marking for EMC and LVD compliance. For regulated environments, it supports 21 CFR Part 11–aligned data integrity workflows when paired with ATAGO’s optional RefRex software.
Software & Data Management
While fully functional as a standalone instrument, the NAR-2T LO integrates seamlessly with ATAGO’s RefRex PC software (Windows-compatible, optional license). RefRex enables batch data logging, statistical process control (SPC) charting (X-bar/R, Cp/Cpk), customizable report generation (PDF/CSV), and multi-instrument fleet management. All measurements include embedded metadata: date/time stamp, user ID, temperature setpoint, calibration status, and pass/fail flags against user-defined specification limits. Audit trails are immutable and exportable for internal QA review or regulatory submission. Data files are encrypted and support hash verification to fulfill ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) principles.
Applications
- Quality control of specialty solvents and cleaning agents in semiconductor fabrication and precision optics manufacturing
- Concentration monitoring of low-index monomers and oligomers in UV-curable resin formulation
- Batch release testing of fluorinated lubricants and heat-transfer fluids per ASTM D1218 and ISO 2812-3
- R&D characterization of bio-based oils and synthetic esters in renewable energy applications
- Verification of refractive index matching in optical adhesive bonding processes for display and sensor assembly
- Teaching laboratories requiring stable, repeatable Abbe principle demonstrations with digital traceability
FAQ
What is the minimum sample volume required for reliable measurement?
Typically ≥0.1 mL; sufficient to cover the prism surface uniformly without overflow.
Does the NAR-2T LO support automatic temperature compensation to 20 °C?
Yes—real-time compensation is applied during measurement and displayed alongside raw nD values.
Can it measure opaque or highly viscous samples?
It is designed for transparent to translucent liquids; turbid or highly scattering samples require centrifugation or filtration prior to analysis.
Is factory calibration traceable to NIST or other national metrology institutes?
Yes—each unit ships with a calibration certificate traceable to JCSS (Japan Calibration Service System), equivalent to ISO/IEC 17025 accreditation.
What maintenance is required to sustain long-term accuracy?
Daily prism cleaning with lens-grade tissue and recommended solvent; annual verification using ATAGO-certified reference standards is advised for GMP environments.
