ATAGO PAL-15S Portable Digital Glucose Refractometer

Overview

The ATAGO PAL-15S Portable Digital Glucose Refractometer is a precision optical instrument engineered for rapid, field-deployable quantification of glucose concentration in aqueous solutions via the principle of critical-angle refractometry. It operates on the fundamental relationship between solution density and refractive index—calibrated specifically for glucose (not sucrose or general Brix), delivering direct % w/w glucose readings without conversion factors. Unlike generic refractometers, the PAL-15S incorporates ATAGO’s proprietary temperature-compensated optical system (ATC), which automatically corrects measurements across a functional ambient range of 10–40°C, eliminating manual correction tables and minimizing operator-induced variability. Its compact, ergonomic design and robust housing meet IP65 ingress protection standards—ensuring reliable operation in humid, dusty, or splash-prone environments typical of food processing lines, agricultural testing sites, clinical research labs, and quality control stations.

Key Features

• Glucose-specific calibration traceable to NIST-traceable reference standards, ensuring metrological integrity for regulatory documentation.
• High-stability Abbe-type prism with sapphire-coated measuring surface, resistant to scratching and chemical degradation from repeated sample contact.
• Auto-power-off after 3 minutes of inactivity, extending battery life; low-battery indicator alerts users prior to measurement drift.
• One-touch measurement cycle: single drop application → automatic prism wetting detection → 3-second stabilization → digital readout with 0.1% resolution.
• Non-invasive, solvent-free analysis requiring only 0.3 mL sample volume per test—ideal for precious or limited biological specimens.
• Rugged polycarbonate housing with rubberized grip zones and sealed optical chamber, certified to IP65 for dust-tightness and water-jet resistance.

Sample Compatibility & Compliance

The PAL-15S is validated for clear to mildly turbid aqueous glucose solutions—including cell culture media, fermentation broths, dialysates, fruit juice extracts, and pharmaceutical syrup formulations. It is not suitable for viscous, highly colored, or suspended-particle-laden samples without prior centrifugation or filtration. While not intended for diagnostic use under FDA 21 CFR Part 866.2100, the instrument supports GLP-compliant workflows through documented calibration logs (performed annually using ATAGO-certified standard solutions: 5.0%, 10.0%, and 30.0% glucose). Its measurement uncertainty budget aligns with ISO 5725-2:2019 guidelines for intermediate precision in routine laboratory settings. CE marking confirms conformity with EU Directive 2014/30/EU (EMC) and 2014/35/EU (LVD).

Software & Data Management

The PAL-15S operates as a standalone instrument with no embedded memory or USB interface; however, it integrates seamlessly into digital QA/QC ecosystems via optional ATAGO DataLogger software (compatible with Windows 10/11) when paired with the PAL-USB adapter (sold separately). This enables timestamped data export to CSV or Excel formats, batch ID assignment, user-defined pass/fail limits, and automated report generation compliant with ISO/IEC 17025 documentation requirements. Audit trails—including operator ID, calibration date, ambient temperature, and measurement sequence—are retained for internal review and external audit readiness.

Applications

• Monitoring glucose depletion kinetics during microbial fermentation in bioprocess development.
• Verifying final concentration of glucose-based IV admixtures in hospital pharmacy compounding units.
• Validating consistency of glucose fortification in infant formula and sports nutrition products.
• Field screening of grape must maturity in viticulture, supporting harvest timing decisions.
• Teaching core principles of optical density–concentration relationships in undergraduate biochemistry laboratories.
• Supporting stability studies of lyophilized glucose standards under accelerated aging conditions.

FAQ

Is the PAL-15S calibrated for sucrose or total soluble solids (TSS)?

No—the PAL-15S is factory-calibrated exclusively for D-glucose in water. Using it for sucrose, fructose, or mixed-sugar solutions will yield inaccurate results due to differing molecular refraction coefficients.
Can I use ethanol-based cleaning agents on the prism?

Yes, but only in concentrations ≤70% v/v and with immediate rinsing using deionized water followed by gentle drying with lens tissue. Prolonged exposure to >80% ethanol may degrade the prism’s anti-reflective coating.
Does the ATC function compensate for sample temperature or ambient temperature?

The ATC sensor measures the prism block temperature, which equilibrates rapidly with the applied sample—thus providing real-time compensation based on actual sample thermal state, not ambient air temperature.
How often should I recalibrate the instrument?

ATAGO recommends verification with certified glucose standards before each daily use in regulated environments; full recalibration by an authorized service center is required annually or after 10,000 measurements, whichever occurs first.
Is the PAL-15S compliant with FDA 21 CFR Part 11 for electronic records?

As a stand-alone analog-to-digital converter without audit trail or electronic signature capability, the PAL-15S itself does not meet Part 11 requirements—but its output data can be captured and managed within a compliant LIMS or ELN platform that satisfies those criteria.