Atago NAR-4T High-Range Abbe Refractometer
| Origin | Japan |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | NAR-4T |
| Price | Upon Request |
Overview
The Atago NAR-4T High-Range Abbe Refractometer is a precision optical instrument engineered for accurate refractive index (nD) measurement of materials with exceptionally high optical density—particularly advanced polymers, specialty films, adhesives, and high-index resins used in optics, electronics, and coating industries. Unlike conventional Abbe refractometers limited to nD ≤ 1.7000, the NAR-4T employs an optimized optical path design incorporating high-transmittance prisms and calibrated dispersion compensation to extend its measurable range to nD 1.4700–1.8700. It operates on the principle of total internal reflection at the sample-prism interface, where the critical angle is optically detected and converted into a digital refractive index reading. Temperature-controlled measurement is integral to metrological reliability; the unit features a built-in thermistor-based digital thermometer with real-time thermal compensation, ensuring traceable results compliant with ISO 21748 and ASTM D1218 standards for refractive index determination.
Key Features
- Extended refractive index range: nD 1.4700 to 1.8700 — specifically designed for high-index polymer films, optical adhesives, and semiconductor-grade resins
- Digital readout with 0.001 resolution and ±0.0002 accuracy at 20 °C, meeting ISO 17025 calibration traceability requirements
- Integrated digital temperature sensor (0.0–50.0 °C) with ±0.2 °C accuracy and 0.1 °C display resolution; automatic temperature compensation algorithm applied to all readings
- Stable tungsten-filament light source (8 V, 0.15 A) providing consistent spectral output in the sodium D-line (589.3 nm) region
- Modular prism assembly with interchangeable main and auxiliary prisms (RE-1403/RE-1404 and RE-1411), enabling field serviceability and application-specific configuration
- Multi-voltage power compatibility (115 V / 220 V / 240 V, 50/60 Hz) and low power consumption (≤5 VA) for laboratory and production-floor deployment
- Compact benchtop footprint (13 × 18 × 23 cm, 2.5 kg) with ergonomic viewing angle and anti-glare ocular design
Sample Compatibility & Compliance
The NAR-4T accommodates viscous, semi-solid, and thin-film samples—including PET and PC-based optical films, UV-curable resins, silicone gels, and epoxy encapsulants—via optional film-measurement accessories (e.g., RE-1498 and RE-1499 film holders). Its high-index capability eliminates the need for intermediate liquids in many cases; however, when required, certified immersion fluids (e.g., monobromonaphthalene, sulfur iodide methylene, or proprietary LJ fluid) are available under strict purity specifications (≥99.9%). The instrument conforms to GLP documentation practices and supports audit-ready operation when paired with Atago’s optional DTM-1 thermistor probe (model-specific voltage variants RE-1164/RE-1165/RE-1166). Calibration verification is performed using certified reference standards (e.g., RE-1195 and RE-1197), traceable to NIST SRM 1484 and JIS K 0061.
Software & Data Management
While the NAR-4T is a standalone analog-digital hybrid instrument without embedded USB or Bluetooth connectivity, it supports manual data logging compatible with LIMS and ELN systems via standardized reporting templates. All temperature-compensated nD values are recorded with timestamp, operator ID, and calibration status metadata per GLP requirement. Optional accessories—including polarizing eyepiece (RE-1146) for birefringent sample evaluation—and thermal stabilization kits enable integration into regulated environments governed by FDA 21 CFR Part 11 when combined with validated external data capture workflows.
Applications
- Quality control of high-refractive-index optical films in display and lens manufacturing
- In-process monitoring of polymerization degree in acrylic and polycarbonate synthesis
- Concentration verification of specialty solvents (e.g., DMF, NMP) and etchants in microelectronics fabrication
- R&D characterization of photonic materials, including chalcogenide glasses and perovskite precursors
- Verification of refractive index matching in adhesive bonding applications for optical assemblies
- Supporting ASTM D523, ISO 489, and JIS K 7105 test protocols for transparent plastics and coatings
FAQ
What is the minimum sample volume required for measurement?
A single drop (≈0.1 mL) is sufficient for liquid samples; film measurements require a flat, defect-free area ≥10 mm × 10 mm.
Can the NAR-4T be calibrated in-house?
Yes—using certified calibration standards (e.g., RE-1195 or RE-1197) and following Atago’s documented procedure (ATG-OP-NAR4T-REV3); full calibration reports are accepted for ISO 17025 accreditation.
Is temperature control external or internal?
Temperature sensing is internal via integrated thermistor; however, precise thermal equilibration requires use of a certified water bath or Peltier stage (not included) for measurements outside ambient lab conditions.
Are replacement prisms supplied with certification?
All genuine Atago prism sets (RE-1403, RE-1404, RE-1411) ship with individual calibration certificates referencing NIST-traceable interferometric verification.
Does the instrument comply with pharmacopeial standards?
It meets USP and EP 2.2.6 refractometry requirements when operated within specified temperature tolerance (±0.2 °C) and validated per user-defined SOPs.
