ATAGO NAR-2T Benchtop Digital Refractometer with Temperature Control

Overview

The ATAGO NAR-2T is a high-precision benchtop digital refractometer engineered for accurate, repeatable measurement of refractive index (n_D) and Brix concentration in liquid and semi-solid samples under controlled thermal conditions. Based on the principle of total internal reflection at the prism-sample interface, the instrument determines n_D by detecting the critical angle of light refraction—directly correlated to solute concentration and temperature-dependent optical density. Unlike handheld or analog units, the NAR-2T integrates active Peltier-based temperature control and real-time digital readout, eliminating manual calibration drift and operator-dependent interpretation. Its design conforms to international refractometric standards including ISO 21745:2021 (refractometry for sugar solutions), ASTM D1218 (refractive index of hydrocarbon liquids), and supports traceable QC workflows in regulated environments such as food & beverage QA, pharmaceutical excipient verification, and chemical formulation labs.

Key Features

• Peltier-controlled thermostatic sample stage enabling precise temperature regulation from 5°C to 120°C, with dual-zone accuracy: ±0.2°C (0–100°C) and ±0.5°C (100–120°C)
• High-resolution digital display showing both refractive index (n_D) and Brix (%) simultaneously, with 0.0001 n_D and 0.1% Brix resolution
• Calibration traceability via ATAGO-certified reference standards (e.g., distilled water at 20°C: n_D = 1.3330; sucrose solution at 20°C: 10.00% Brix)
• Robust stainless-steel prism assembly with scratch-resistant sapphire coating, rated for repeated exposure to aggressive solvents, acids, and viscous media
• Integrated temperature monitoring with external sensor input and independent digital display unit for real-time thermal validation
• Compliance-ready architecture supporting GLP/GMP documentation: auto-log timestamped measurements, user ID tagging, and non-editable data export (CSV format)

Sample Compatibility & Compliance

The NAR-2T accommodates a broad spectrum of homogeneous liquid and semi-solid samples—including aqueous sugar solutions, glycerol-water mixtures, polymer emulsions, pharmaceutical syrups, fruit juices, and industrial coolants—provided they exhibit optical clarity at the measurement wavelength (589 nm sodium D-line). It is not intended for highly scattering, turbid, or strongly fluorescent matrices without prior filtration or dilution. For solid-phase characterization (e.g., thin films, optical resins), optional prism adapters enable surface contact measurement per ISO 489:2016. All operational parameters adhere to IEC 61010-1 safety requirements for laboratory electrical equipment. The instrument’s temperature-controlled measurement protocol satisfies USP and EP 2.2.12 refractometric testing guidelines for concentration verification in pharmacopeial applications.

Software & Data Management

While the NAR-2T operates as a standalone instrument, its RS-232 interface enables seamless integration with laboratory information management systems (LIMS) and enterprise quality databases. Measurement data—including n_D, Brix, temperature, date/time stamp, operator ID, and instrument serial number—is output in ASCII format for direct ingestion into statistical process control (SPC) platforms. Optional ATAGO Data Manager software (v3.2+) provides audit-trail functionality compliant with FDA 21 CFR Part 11, including electronic signatures, role-based access control, and immutable record archiving. Raw data files retain metadata required for ISO/IEC 17025 accreditation audits.

Applications

• Food & Beverage: Brix quantification in fruit concentrates, honey, soft drink syrups, and dairy-based beverages for consistency control and labeling compliance
• Pharmaceuticals: Excipient concentration verification (e.g., dextrose, sorbitol, propylene glycol) in oral solutions and injectables per USP monographs
• Chemical Manufacturing: Monitoring glycol concentration in heat-transfer fluids, ethylene oxide/water ratios in sterilant formulations, and resin solids content
• Academic Research: Solvent purity assessment, polymer solution thermodynamics, and phase behavior studies requiring temperature-resolved refractive index profiling
• Quality Assurance Labs: Incoming raw material screening, in-process checks during blending operations, and final product release testing

FAQ

What is the maximum operating temperature for continuous measurement?
The NAR-2T supports sustained operation up to 120°C at the prism surface, with thermal stability maintained within ±0.5°C in the upper range.
Can the instrument measure non-aqueous solvents like ethanol or acetone?
Yes—provided the solvent is optically clear and does not chemically attack the sapphire-coated prism; ATAGO recommends verifying compatibility using Material Safety Data Sheets (MSDS) prior to routine use.
Is calibration verification required before each use?
Per ISO/IEC 17025 and internal QA protocols, daily calibration verification using certified reference standards is recommended; full recalibration is performed annually or after mechanical impact.
Does the NAR-2T support custom concentration scales beyond Brix?
Yes—the instrument allows user-defined conversion tables for NaCl (% w/w), alcohol (% v/v), or proprietary formulations, stored in non-volatile memory.
How is temperature uniformity ensured across the prism surface?
A microprocessor-controlled Peltier module, coupled with embedded platinum RTD sensors and closed-loop feedback, maintains spatial temperature deviation below ±0.1°C across the 25 mm² measurement area.