ATAGO PAL-43S Digital Portable Refractometer for Refractive Index and Brix Measurement
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | PAL-43S |
| Product Type | Handheld Refractometer |
| Display | Digital LCD |
| Temperature Compensation | Automatic (ATC), 10–35°C |
| Measurement Range | 0.0–45.0% Brix |
| Accuracy | ±0.4% Brix |
| Resolution | 0.1% Brix |
| Compliance | ISO 2173, AOAC 985.21, ASTM D1074 |
Overview
The ATAGO PAL-43S is a precision-engineered handheld digital refractometer designed for rapid, field-deployable measurement of refractive index and Brix concentration in aqueous solutions. Based on the fundamental optical principle of total internal reflection, the instrument determines solute concentration by measuring the critical angle shift at the prism-sample interface—calibrated to the standard sucrose/water scale per ISO 2173 and AOAC Official Method 985.21. Unlike benchtop Abbe-type instruments, the PAL-43S integrates a high-stability sapphire prism, thermally compensated optics, and a built-in temperature sensor enabling real-time Automatic Temperature Compensation (ATC) across 10–35°C. Its compact, ergonomic design meets IP65-rated ingress protection, ensuring reliable operation in production lines, quality control labs, food processing facilities, and field-based agricultural testing environments. The device delivers traceable, repeatable results without external power or consumables—ideal for GLP-aligned routine analysis where portability and metrological integrity are equally critical.
Key Features
- Digital LCD display with 0.1% Brix resolution and intuitive icon-driven interface
- Integrated sapphire prism for exceptional scratch resistance and long-term optical stability
- Automatic Temperature Compensation (ATC) compliant with ISO 2173 Annex A, eliminating manual correction tables
- Battery-powered operation (2× AAA, ~10,000 measurements per set) with auto-power-off after 3 minutes of inactivity
- Calibration verification via ATAGO-certified standard solution (e.g., 10.00% Brix @ 20°C, Cat. No. 4400)
- Non-destructive, single-drop sampling (0.3 mL typical); measurement completes in <2 seconds
- Robust housing with chemical-resistant casing rated IP65 for dust and water jet resistance
Sample Compatibility & Compliance
The PAL-43S is optimized for transparent, non-viscous, non-suspended aqueous solutions including fruit juices, soft drinks, syrups, honey, brines, and industrial coolant concentrates. It is not intended for opaque emulsions, highly viscous polymers, or volatile organic solvents without dedicated ATAGO PAL models (e.g., PAL-33S for ethanol, PAL-37S for IPA). Regulatory alignment includes full traceability to NIST-traceable calibration standards, conformance with ISO 2173 (fruit products), AOAC 985.21 (dairy and beverages), and ASTM D1074 (asphalt binder analysis). While not FDA 21 CFR Part 11–compliant out-of-the-box (lacking audit trail or electronic signature), its measurement records support GMP/GLP documentation when paired with controlled lab notebooks and validated SOPs.
Software & Data Management
The PAL-43S operates as a standalone instrument with no embedded memory or data export capability. All measurements are displayed in real time and must be manually recorded. For laboratories requiring digital traceability, ATAGO offers optional accessories including the RS-232 interface cable (Cat. No. 3110) and proprietary LogMaster™ software (sold separately), enabling PC-based data logging, statistical analysis (mean, SD, CV%), and CSV export compatible with LIMS integration. Calibration history, operator ID, and timestamping require external documentation per ISO/IEC 17025 clause 7.7; the device itself maintains no internal audit trail.
Applications
- Food & Beverage: Brix verification in juice blending, jam production, sugar syrup formulation, and wine must analysis
- Agriculture: Field assessment of grape, citrus, and mango ripeness prior to harvest
- Pharmaceutical Excipients: Concentration control of sucrose-based oral suspensions and syrup vehicles
- Chemical Manufacturing: Monitoring glycol-based antifreeze dilution ratios and cleaning solution strength
- Education & Research: Teaching optical principles, solution thermodynamics, and calibration methodology in undergraduate labs
- Quality Assurance: In-line spot-checking of incoming raw materials (e.g., invert sugar, corn syrup) against COA specifications
FAQ
What is the recommended calibration frequency?
ATAGO recommends calibration before each use session or at least every 2 hours during continuous operation, using certified 0.0% and 10.00% Brix reference solutions (Cat. Nos. 4400, 4401).
Can the PAL-43S measure non-sugar solutions like sodium chloride or ethylene glycol?
No—the PAL-43S is factory-calibrated exclusively to the sucrose scale (Brix % w/w). For NaCl or glycol, use ATAGO’s dedicated PAL models (e.g., PAL-ES for salt, PAL-Glycol for ethylene glycol) with appropriate scale conversion.
Is temperature compensation valid outside 10–35°C?
ATC compensation is only guaranteed within the specified 10–35°C ambient range. Measurements taken below 10°C or above 35°C will exhibit uncorrected thermal drift and fall outside stated accuracy limits.
How should the prism surface be cleaned between samples?
Wipe gently with lens tissue moistened with distilled water or isopropyl alcohol (≥99%), then dry with clean, lint-free cloth. Avoid abrasive cleaners or excessive pressure.
Does the PAL-43S comply with ISO/IEC 17025 requirements?
The instrument itself is not accredited, but it supports compliance when used within a documented quality system—including regular verification with traceable standards, environmental monitoring, and technician competency records.
