ATAGO RX-5000i Advanced Temperature-Controlled Digital Desktop Refractometer

Overview

The ATAGO RX-5000i is a high-precision, temperature-controlled digital desktop refractometer engineered for laboratory and quality control environments requiring traceable, repeatable optical measurements of liquid samples. It operates on the principle of critical angle refraction—measuring the refractive index (n_D) of a sample at the sodium D-line wavelength (589.3 nm) using a synthetic sapphire prism and high-stability LED light source. The instrument integrates a Peltier-based thermoelectric cooling/heating system that enables precise, programmable temperature control from 5.00 to 75.00 °C without external water baths—ensuring compliance with standardized test conditions per ISO 21527 and ASTM D1218. Its core function is the determination of refractive index and corresponding Brix concentration (sucrose-equivalent % w/w), widely applied in food, pharmaceutical, chemical, and biotechnology workflows where solution composition must be quantified under controlled thermal conditions.

Key Features

• High-resolution touchscreen interface with intuitive icon-driven navigation and real-time graphical feedback during measurement cycles.
• Integrated Peltier temperature control system with ±0.05 °C stability and 0.01 °C resolution—eliminates dependency on external chillers or thermostatic baths.
• Optical path constructed with synthetic sapphire prism (Vickers hardness >2000 HV) and SUS316 stainless steel sample stage for corrosion resistance and long-term dimensional stability.
• Four configurable measurement modes: MODE-1 (temperature-stabilized precision mode), MODE-2 (interval-sampled n_D/temp logging), MODE-3 (non-temperature-controlled rapid measurement, <4 s response), and MODE-S (stability-triggered acquisition for volatile or thermally sensitive samples).
• Built-in calibration verification routine with automatic self-diagnostic checks before each measurement cycle, ensuring optical alignment, thermal equilibrium, and sensor integrity.
• Support for up to 100 user-defined concentration scales—including non-sucrose matrices (e.g., glucose, fructose, NaCl, ethanol, glycols)—with linear or polynomial curve fitting options.

Sample Compatibility & Compliance

The RX-5000i accommodates aqueous and organic liquid samples with viscosity ≤500 mPa·s and volatility compatible with closed-sample handling. Its sapphire prism and inert stainless-steel stage resist degradation from acids, alkalis, solvents, and high-sugar formulations—making it suitable for QC in juice processing, fermentation monitoring, pharmaceutical syrup formulation, and electrolyte testing. The instrument complies with international standards including ISO 21527 (microbiological analysis—enumeration of yeasts and molds), ASTM D1218 (refractive index of hydrocarbon liquids), and USP (Refractive Index). When paired with optional FDA 21 CFR Part 11-compliant data management software, it supports audit trails, electronic signatures, role-based access control, and secure export of raw n_D, Brix, temperature, timestamp, operator ID, and calibration history—meeting GLP and GMP documentation requirements.

Software & Data Management

Data output is supported via RS-232C serial interface for integration into LIMS or MES platforms. Optional thermal printer support enables immediate hard-copy generation of measurement reports. Internal memory retains ≥500 most recent records—including n_D, Brix, temperature, date/time stamp, scale ID, and operator code—with overwrite protection for critical batches. The optional FDA 21 CFR Part 11 software package provides full electronic record integrity: immutable audit trail, session locking, pre-defined user roles (administrator, analyst, reviewer), and encrypted database storage compliant with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Applications

• Food & Beverage: Brix validation in fruit juices, soft drinks, dairy concentrates, and honey; sugar recovery optimization in cane/beet processing.
• Pharmaceuticals: Excipient concentration verification in syrups and oral solutions; density correlation for API solubility studies.
• Chemical Manufacturing: Ethanol/water blend verification, glycol concentration in antifreeze, HCl/HNO₃ titration support.
• Biotechnology: Media osmolality screening, cell culture supernatant sugar profiling, fermentation broth monitoring.
• Academic Research: Refractive index calibration standards development, polymer solution characterization, nanoparticle dispersion stability assessment.

FAQ

Does the RX-5000i require external water circulation for temperature control?
No—the integrated Peltier element enables fully self-contained temperature regulation between 5.00 and 75.00 °C without auxiliary chillers or recirculators.
Can the instrument measure non-sucrose solutions accurately?
Yes—100 user-definable scales support custom calibration curves for diverse solutes including glucose, sodium chloride, propylene glycol, and industrial alcohols.
Is data export compatible with common laboratory informatics systems?
Yes—RS-232C output delivers ASCII-formatted measurement logs with configurable delimiters, supporting direct ingestion into Excel, LabWare LIMS, and Thermo Fisher SampleManager.
What maintenance is required for long-term accuracy?
Daily prism cleaning with lens tissue and recommended ATAGO cleaning fluid; annual verification using NIST-traceable sucrose standards (e.g., 10.00%, 30.00%, 60.00% Brix reference solutions) is advised.
How does MODE-S differ from standard temperature-controlled measurement?
MODE-S monitors real-time n_D drift and triggers measurement only after detecting sample thermal and optical stabilization—critical for low-boiling-point solvents or emulsions prone to evaporation or phase separation.