ATAGO PAL-Peracetic Acid Handheld Refractometer

Overview

The ATAGO PAL-Peracetic Acid Handheld Refractometer is a dedicated optical instrument engineered for rapid, on-site quantification of peracetic acid (PAA) concentration in aqueous disinfectant solutions. Unlike general-purpose refractometers, this model employs a custom-calibrated optical path and temperature-compensated algorithm optimized specifically for the refractive index–concentration relationship of PAA within the physiologically and industrially critical range of 10–1000 ppm. It operates on the principle of total internal reflection at the prism–sample interface, where incident light undergoes angular deviation proportional to the solution’s refractive index—a property linearly correlated with PAA mass concentration under controlled ionic strength and pH conditions. Designed for routine quality control in healthcare sterilization workflows, pharmaceutical cleanroom validation, food processing sanitation verification, and environmental hygiene monitoring, the PAL-Peracetic Acid eliminates reliance on time-consuming titrimetric or spectrophotometric methods while maintaining traceable accuracy suitable for GLP-aligned documentation.

Key Features

• Dedicated optical calibration for peracetic acid across 10–1000 ppm—no user interpolation or curve-fitting required
• Digital LCD display with automatic zero-point compensation and real-time measurement stabilization in ≤3 seconds
• Titanium-coated sample prism surface ensuring long-term resistance to oxidative corrosion and acidic degradation
• IP65-rated enclosure providing dust-tight and water-jet resistant protection for use in wet, high-humidity, or splash-prone environments (e.g., hospital decontamination zones, food wash lines)
• Compact ergonomic design (100 g, 5.5 × 3.1 × 10.9 cm) enabling single-hand operation and field deployment without external power infrastructure
• Factory-calibrated using NIST-traceable peracetic acid reference standards; optional recalibration service available via ATAGO-certified labs

Sample Compatibility & Compliance

The PAL-Peracetic Acid is validated for use with clear, low-turbidity aqueous PAA solutions containing typical stabilizers (e.g., hydrogen peroxide, acetic acid, dipicolinic acid) at ambient temperatures (10–30 °C). It is not intended for viscous, emulsified, or heavily particulate matrices without prior filtration (≤5 µm pore size). The instrument complies with ISO 21748:2017 (Guidance for the evaluation of measurement uncertainty in quantitative analysis) and supports audit readiness under FDA 21 CFR Part 11 when paired with ATAGO’s optional data logging accessories and electronic signature-enabled reporting software. Its measurement protocol aligns with ASTM E2698-21 (Standard Practice for Validation of Disinfectant Concentration Monitoring Devices) for point-of-use verification in healthcare facility environmental services programs.

Software & Data Management

While the standalone unit operates without connectivity, the PAL-Peracetic Acid is compatible with ATAGO’s PAL-Link PC software (Windows/macOS) via optional USB-Serial adapter. This enables export of timestamped measurement logs (CSV/Excel), batch-level statistical summaries (mean, SD, CV%), trend charting over time, and generation of PDF reports compliant with internal QA templates. All data files include embedded instrument ID, calibration date, operator ID field, and environmental temperature metadata—supporting full traceability for ISO 13485 or GMP Annex 1 documentation requirements. Audit trail functionality records all calibration events, firmware updates, and user-defined parameter changes with immutable timestamps.

Applications

• Verification of PAA concentration in automated endoscope reprocessors (AERs) prior to cycle initiation
• Routine monitoring of PAA levels in pharmaceutical-grade clean-in-place (CIP) systems for bioreactor trains
• On-the-spot validation of disinfectant dilutions used in USDA-FSIS-regulated meat and poultry processing facilities
• Field assessment of fogging or vaporized hydrogen peroxide (VHP)-PAA hybrid formulations during hospital terminal cleaning audits
• QC release testing of commercial PAA-based disinfectant concentrates against label claims (e.g., 15% w/w stock solutions diluted to 200 ppm working strength)
• Educational use in university microbiology and industrial hygiene laboratories for teaching quantitative disinfectant management principles

FAQ

Does this refractometer measure total oxidant concentration or only peracetic acid?
It measures peracetic acid-specific concentration based on its unique refractive index contribution. Coexisting hydrogen peroxide may cause minor positive bias ( 500 ppm); confirm accuracy via titration if H₂O₂ exceeds 10% of total oxidant load.
Can it be used with acidic or buffered PAA formulations containing surfactants?
Yes—provided turbidity remains below 3 NTU and surfactant concentration is <0.1% w/v. High foaming agents require degassing prior to measurement.
Is temperature correction applied automatically?
No active thermoelectric control is included, but the built-in algorithm applies digital temperature compensation using an integrated thermistor (accuracy ±0.5 °C) referenced to 20 °C calibration standard.
What maintenance is required to ensure long-term accuracy?
Wipe prism with lint-free cloth and distilled water after each use; avoid alcohol or abrasive cleaners. Perform daily zero-check with supplied blank solution; recalibrate monthly or per SOP using certified PAA standards.
Is firmware upgradable in the field?
Yes—via PAL-Link software and USB adapter. ATAGO releases periodic updates addressing new regulatory thresholds (e.g., EPA List N PAA minimum efficacy concentrations) and expanded calibration linearity ranges.