ATAGO PAL-BX/RI Dual-Scale Portable Digital Refractometer

Overview

The ATAGO PAL-BX/RI Dual-Scale Portable Digital Refractometer is a precision optical instrument engineered for rapid, field-deployable measurement of both refractive index (n_D) and Brix concentration in liquid samples. Based on the fundamental principle of Snell’s law, the device determines sample concentration by measuring the critical angle of total internal reflection at the prism–sample interface. Its dual-scale functionality enables simultaneous readout of Brix (% w/w sucrose equivalent) and absolute refractive index—two complementary parameters essential for quality control, formulation verification, and process monitoring across food, beverage, pharmaceutical, and chemical industries. Integrated Automatic Temperature Compensation (ATC) ensures traceable accuracy across a wide operational range (10–100°C), eliminating manual correction and reducing operator-dependent error. Designed and manufactured in Japan to ATAGO’s stringent metrological standards, the PAL-BX/RI complies with ISO 21748 (guidance on uncertainty of measurement) and supports routine calibration using certified sucrose standards or distilled water per ASTM D1218.

Key Features

• Simultaneous dual-scale digital display: Brix (%) and refractive index (n_D) updated in real time
• High-resolution optical prism system with sapphire-coated surface for scratch resistance and long-term refractive stability
• Automatic Temperature Compensation (ATC) calibrated to the internationally accepted sucrose–temperature relationship (ICUMSA standard)
• IP65-rated enclosure for dust-tight operation and protection against low-pressure water jets—suitable for production floor, warehouse, and outdoor use
• Compact ergonomic form factor (5.5 × 3.1 × 10.9 cm; 100 g) optimized for one-handed operation and extended field deployment
• Low-power design powered by two standard AAA batteries, delivering >10,000 measurements per set under typical usage conditions

Sample Compatibility & Compliance

The PAL-BX/RI accepts aqueous solutions, syrups, juices, coolants, antifreeze mixtures, and transparent cleaning agents—provided they are optically homogeneous and non-volatile during measurement. It is not intended for highly viscous, turbid, or strongly absorbing media without prior dilution or filtration. Sample volume requirement is ≤0.3 mL, applied directly onto the temperature-stabilized prism surface. The instrument meets IEC 61000-4 electromagnetic compatibility requirements and conforms to JIS K 0063 (Japanese Industrial Standard for refractometers). For regulated environments—including pharmaceutical QC labs operating under GLP or GMP—the device supports documented calibration procedures and traceable verification using NIST-traceable sucrose reference materials (e.g., USP compliant standards).

Software & Data Management

While the PAL-BX/RI operates as a standalone, battery-powered instrument with no onboard data logging, its measurement output is fully compatible with external documentation workflows. Users may record readings manually into laboratory notebooks or electronic lab notebooks (ELNs) with full metadata (operator ID, timestamp, sample ID, ambient temperature). For audit-ready environments, the instrument’s consistent repeatability (RSD <0.15% for Brix at 20°C) and factory calibration certificate support 21 CFR Part 11–aligned validation protocols when integrated into broader quality management systems. Optional ATAGO accessories—including calibration kits, carrying cases with humidity control, and prism cleaning tools—are available to maintain measurement integrity across extended service intervals.

Applications

• Food & Beverage: Rapid Brix verification of fruit juices, jams, soft drinks, honey, and dairy-based concentrates
• Automotive & Industrial Fluids: Glycol concentration monitoring in engine coolants and heat-transfer fluids
• Pharmaceutical Manufacturing: Excipient solution concentration checks (e.g., dextrose, sorbitol) during syrup preparation
• Agricultural Extension: On-site ripeness assessment of horticultural crops via juice Brix screening
• Academic Teaching Labs: Demonstrating optical principles, solution thermodynamics, and calibration traceability in physical chemistry courses

FAQ

Does the PAL-BX/RI require periodic recalibration?

Yes—ATAGO recommends annual recalibration using certified reference standards; more frequent verification is advised in high-use or regulated settings.
Can it measure samples below 10°C or above 100°C?

No—the ATC system is validated only within 10–100°C; measurements outside this range will trigger an error warning and halt acquisition.
Is the prism surface resistant to acidic or alkaline samples?

The sapphire-coated prism withstands pH 2–12 exposure when cleaned promptly after use; prolonged contact with strong oxidizers (e.g., hypochlorite) is not recommended.
How does ATC affect measurement uncertainty?

ATC reduces temperature-induced bias to <±0.02% Brix per °C deviation from 20°C, significantly improving inter-laboratory reproducibility compared to manual correction methods.
Is the device suitable for ISO/IEC 17025 accredited testing?

Yes—when operated per ATAGO’s documented procedure and supported by traceable calibration records, it satisfies clause 6.4.10 (measurement equipment suitability) and 6.5.2 (metrological traceability) requirements.