ATAGO NAR-4T High-Range Abbe Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | NAR-4T (High Refractive Index) |
| Measurement Range | 1.4700–1.8700 nD |
| Accuracy | ±0.0002 nD |
| Temperature Control | Yes |
| Digital Display | Yes |
| Instrument Type | Benchtop Abbe Refractometer |
| Compliance | ISO 2163, ASTM D1218, JIS K0061 |
Overview
The ATAGO NAR-4T High-Range Abbe Refractometer is a precision optical instrument engineered for accurate and repeatable measurement of the refractive index (nD) of transparent liquids and solids across an extended high-refractive-index range—from 1.4700 to 1.8700 nD. Based on the classical Abbe principle, it utilizes total internal reflection at the prism-sample interface under monochromatic sodium D-line illumination (589.3 nm). The instrument incorporates a built-in temperature-controlled prism stage with Peltier-based regulation, ensuring thermal stability within ±0.1 °C—critical for minimizing thermal drift in high-precision applications involving oils, resins, optical glasses, and specialty polymers. Designed and manufactured in Japan, the NAR-4T conforms to international standards including ISO 2163 (Refractometers — Specification), ASTM D1218 (Standard Test Method for Refractive Index of Hydrocarbon Liquids), and JIS K0061 (Testing Methods for Optical Properties of Chemicals), making it suitable for QC laboratories operating under GLP or GMP frameworks.
Key Features
- Extended refractive index range (1.4700–1.8700 nD) optimized for high-n materials such as borosilicate glass, epoxy resins, silicone oils, and optical adhesives
- Integrated Peltier temperature control system with digital setpoint adjustment (range: 10–50 °C) and real-time monitoring via LCD display
- High-resolution digital readout with 0.0001 nD resolution and certified accuracy of ±0.0002 nD at 20 °C
- Benchtop ergonomic design with robust aluminum alloy housing, anti-vibration base, and adjustable eyepiece for operator comfort
- Calibration traceable to NIST-certified reference standards; includes factory calibration certificate with uncertainty statement
- Prism surface hardened with sapphire coating to resist scratching during repeated solid-sample measurements
Sample Compatibility & Compliance
The NAR-4T accommodates both liquid and solid transparent samples without requiring dilution or phase change. Liquid samples are applied directly onto the main prism; solid samples—including polished wafers, lens blanks, and polymer sheets—are measured using the optional solid-sample attachment (NAR-SK1), which employs critical-angle geometry with index-matching fluid. All measurements comply with ISO/IEC 17025 requirements for testing laboratories when operated within validated environmental conditions. The instrument supports audit-ready documentation per FDA 21 CFR Part 11 when paired with ATAGO’s optional PC interface software (ReflaSoft™), enabling electronic signatures, user access control, and full data integrity logs.
Software & Data Management
While the NAR-4T operates as a standalone benchtop unit, it is compatible with ATAGO’s ReflaSoft™ PC software via RS-232 or USB-to-serial adapter. ReflaSoft™ enables automated data logging, statistical process control (SPC) charting, batch reporting, and export to CSV or PDF formats. The software maintains full ALCOA+ compliance (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) and supports 21 CFR Part 11-compliant workflows—including role-based user authentication, electronic signature capture, and immutable audit trails for all measurement events and configuration changes.
Applications
- Quality control of optical-grade resins and encapsulants in LED and photonic device manufacturing
- Refractive index verification of specialty glasses (e.g., BK7, SF10, F2) during lens fabrication and coating validation
- Concentration analysis of high-boiling-point solvents and heat-transfer fluids where conventional digital refractometers lack sufficient upper-range coverage
- R&D characterization of novel transparent ceramics and amorphous metal oxides in academic and industrial materials labs
- Regulatory submission support for pharmaceutical excipients and ophthalmic solutions requiring refractive index specification per USP
FAQ
What types of solid samples can be measured with the NAR-4T?
Polished, optically flat solids with refractive indices between 1.4700 and 1.8700 nD, such as optical glass blanks, fused silica wafers, and cured epoxy lenses—provided they are free of surface defects and mounted using index-matching fluid.
Is temperature compensation automatic or manual?
Temperature is actively controlled via integrated Peltier elements; users set the desired prism temperature digitally—the system maintains stability within ±0.1 °C without external chiller units.
Does the NAR-4T meet ISO/IEC 17025 calibration requirements?
Yes—each unit ships with a factory calibration certificate referencing NIST-traceable standards; periodic recalibration by an accredited metrology lab satisfies ISO/IEC 17025 clause 6.6 requirements.
Can measurement data be exported for LIMS integration?
Yes—via ReflaSoft™ software, data can be exported in CSV format with timestamps, operator ID, sample ID, and environmental metadata for seamless LIMS ingestion.
Is the prism surface resistant to aggressive solvents like chloroform or carbon disulfide?
The sapphire-coated prism exhibits excellent chemical resistance; however, prolonged exposure to highly corrosive halogenated solvents is not recommended—cleaning should follow ATAGO’s protocol using ethanol or isopropanol only.
