ATAGO PET-109 Digital Ethanol Refractometer (PALETTE Series)

Overview

The ATAGO PET-109 Digital Ethanol Refractometer is a compact, handheld optical instrument engineered for rapid, on-site quantification of ethanol concentration in aqueous solutions using the principle of total internal reflection. As part of ATAGO’s PALETTE series, it operates on Abbe refractometry—measuring the refractive index (n_D) of a sample at 589 nm (sodium D-line wavelength) and converting it to mass percentage (w/w %) of ethanol via a pre-calibrated polynomial algorithm optimized for ethanol–water binary systems. Designed for routine quality control in distilleries, beverage laboratories, biofuel production facilities, and pharmaceutical ethanol handling environments, the PET-109 delivers consistent readings without requiring solvent calibration or temperature stabilization—making it suitable for ambient-condition field use where portability and operational simplicity are critical.

Key Features

• High-resolution digital LCD display with automatic zero-point confirmation and intuitive one-button operation
• Optimized optical path geometry featuring a sapphire prism surface for enhanced scratch resistance and long-term measurement stability
• Factory-calibrated specifically for ethanol–water mixtures across the full 0.0–45.0% w/w range; calibration verification performed using NIST-traceable standard solutions
• Robust ergonomic housing constructed from impact-resistant polyetherimide (PEI), compliant with IP65 dust/water ingress protection for industrial environments
• No external power supply required—operates on two standard AAA alkaline batteries (typical service life: >10,000 measurements)
• Minimal sample volume requirement: only 0.3 mL per measurement, reducing reagent consumption and waste generation

Sample Compatibility & Compliance

The PET-109 is validated for use with clear, non-turbid, low-viscosity ethanol–water solutions at ambient temperatures between 10–30°C. It is not intended for samples containing suspended solids, high concentrations of glycerol, sugars, or organic solvents other than ethanol and water. While the instrument does not incorporate active temperature compensation, its built-in temperature reference sensor logs ambient temperature during each measurement to support post-acquisition correction using ASTM D1152-18 Annex A1 guidelines. The device conforms to IEC 61010-1:2010 safety standards for electrical equipment used in laboratory environments and supports GLP-compliant documentation workflows when paired with ATAGO’s optional data logging software (sold separately).

Software & Data Management

Although the PET-109 operates as a standalone unit, it is compatible with ATAGO’s free PC-based “Refractometer Data Manager” application via optional USB-to-serial adapter (Model: RS-232C Converter Kit). This software enables timestamped data export in CSV format, batch report generation, statistical analysis (mean, SD, CV%), and audit trail creation meeting FDA 21 CFR Part 11 requirements when deployed with user authentication and electronic signature modules. All firmware updates and calibration certificate templates are accessible through ATAGO’s secure customer portal—requiring valid serial number registration.

Applications

• Real-time ethanol concentration verification during spirit distillation and blending operations
• QC screening of denatured alcohol batches prior to formulation in cosmetics and topical antiseptics
• Field monitoring of fuel-grade ethanol purity in bioethanol distribution terminals
• Verification of ethanol content in hand sanitizer formulations per WHO-recommended specifications (e.g., 80% v/v ethanol equivalent to ~72.5% w/w)
• Educational demonstrations of colligative properties and binary phase behavior in chemistry laboratories

FAQ

Does the PET-109 require periodic recalibration?
Yes—ATAGO recommends annual recalibration against certified ethanol reference standards (e.g., 10.0%, 25.0%, and 40.0% w/w) by an ISO/IEC 17025-accredited service provider.
Can this refractometer measure methanol or isopropanol?
No—the PET-109’s calibration curve is mathematically constrained to ethanol–water systems only; using it for other alcohols will produce inaccurate results.
Is the prism surface resistant to ethanol-induced degradation?
Yes—the sapphire prism exhibits negligible swelling or etching after repeated exposure to undiluted ethanol, ensuring long-term optical fidelity.
What is the minimum detectable change in ethanol concentration?
The instrument resolves increments of 0.1% w/w ethanol under stable lighting and consistent sample application conditions.
How is measurement uncertainty determined for regulatory submissions?
Total measurement uncertainty (k=2) is calculated as ±0.5% w/w (repeatability) + ±0.3% w/w (calibration standard uncertainty) + ±0.2% w/w (temperature effect), yielding a combined expanded uncertainty of ±0.6% w/w.