ATAGO NAR-2T·HI High-Temperature, High-Refractive-Index Abbe Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | NAR-2T·HI |
| Measurement Range | 1.4700–1.8700 nD |
| Accuracy | ±0.0002 nD |
| Temperature Control | Integrated Peltier-based thermostatic stage |
| Display | Digital LCD with real-time nD and temperature readout |
| Instrument Type | Benchtop Abbe refractometer |
| Compliance | Designed for ISO 21748, ASTM D1218, and JIS K 0061 reference methods |
Overview
The ATAGO NAR-2T·HI is a precision benchtop Abbe refractometer engineered for high-accuracy refractive index (nD) measurement of optically dense, thermally sensitive, and high-refractive-index samples — including molten polymers, specialty optical resins, high-boiling-point solvents, and inorganic melts. Unlike conventional Abbe instruments limited to ambient or low-temperature operation, the NAR-2T·HI integrates a robust Peltier-controlled heating/cooling stage capable of stabilizing sample temperatures from 25 °C to 100 °C (±0.1 °C), enabling direct measurement under controlled thermal conditions without external ovens or oil baths. Its optical design adheres to the classical Abbe principle: collimated sodium-D light (589.3 nm) passes through a double-prism assembly (illuminating and measuring prisms), generating a sharp shadow line at the critical angle of total internal reflection. This line is precisely aligned via calibrated vernier scale and digitized by a high-resolution linear CCD array, ensuring traceable, repeatable nD values across its extended range of 1.4700–1.8700.
Key Features
- Extended refractive index range (1.4700–1.8700 nD) optimized for high-n materials such as sulfur, borosilicate glasses, iodinated compounds, and aromatic polymer melts
- Integrated Peltier temperature control system with active cooling and heating; programmable setpoints from 25 °C to 100 °C, stability ±0.1 °C
- Digital LCD display showing real-time nD, sample temperature, and instrument status — no manual scale interpolation required
- High-precision Abbe optics with hardened sapphire measuring prism surface (Vickers hardness >2000 HV) resistant to abrasion and chemical etching
- Benchtop footprint (280 × 220 × 180 mm) with ergonomic sample stage access and quick-clamp prism cover for rapid cleaning and maintenance
- Compliant with international calibration traceability requirements; supports NIST-traceable certified reference standards (e.g., bromonaphthalene, sulfur)
Sample Compatibility & Compliance
The NAR-2T·HI accommodates viscous, semi-solid, and thermally unstable samples that cannot be measured using standard handheld or low-temperature refractometers. Typical applications include quality control of optical adhesives (nD > 1.65), monitoring degradation in high-temperature lubricants, verifying composition in molten salt mixtures, and R&D of chalcogenide glass precursors. The instrument meets functional requirements outlined in ISO 21748 (repeatability assessment of refractometers), ASTM D1218 (refractive index of hydrocarbon liquids), and JIS K 0061 (general test methods for optical constants). Its digital architecture and stable thermal control support GLP-compliant environments when paired with documented calibration procedures and audit-ready log files.
Software & Data Management
While the NAR-2T·HI operates as a standalone instrument, it includes RS-232 serial output for connection to laboratory PCs or LIMS systems. Optional ATAGO Data Logger software (v3.2+) enables time-stamped data capture, multi-point temperature ramp logging, statistical analysis (mean, SD, CV%), and export to CSV or PDF formats. All measurements retain embedded metadata: date/time, operator ID (user-defined), temperature setpoint, and calibration certificate ID. The firmware supports 21 CFR Part 11–compatible user authentication protocols when deployed in regulated pharmaceutical or materials certification labs requiring electronic record integrity.
Applications
- Characterization of high-refractive-index optical materials during melt processing and annealing
- In-process verification of monomer conversion in thermoset resin synthesis (e.g., epoxy-anhydride systems)
- Thermal stability profiling of ionic liquids and deep eutectic solvents
- QC testing of specialty optical cements and UV-curable lens coatings
- Research on phase transitions in binary and ternary high-n liquid mixtures
- Calibration validation of FTIR and ellipsometry setups requiring independent nD reference points
FAQ
What is the maximum operating temperature of the sample stage?
The integrated Peltier stage maintains stable temperatures up to 100 °C; continuous operation above 90 °C requires adequate lab ventilation and periodic thermal recalibration.
Can the NAR-2T·HI measure opaque or highly scattering samples?
No — like all Abbe refractometers, it requires optically transparent or translucent samples with sufficient transmission at 589.3 nm; turbid or particulate-laden fluids must be filtered or centrifuged prior to analysis.
Is prism cleaning solvent-resistant?
Yes — the sapphire prism surface tolerates common organic solvents (acetone, toluene, chloroform) and mild alkaline cleaners; avoid hydrofluoric acid or abrasive pastes.
How often should calibration be performed?
Daily verification with certified reference standards is recommended for GMP/GLP workflows; full calibration per ISO 8655–7 is advised every 3 months or after mechanical shock or thermal cycling beyond specification limits.
