ATAGO PR-50HO Digital Handheld Hydrogen Peroxide Refractometer

Overview

The ATAGO PR-50HO is a dedicated digital handheld refractometer engineered for rapid, field-deployable quantification of hydrogen peroxide (H₂O₂) concentration in aqueous solutions—specifically calibrated for industrial sterilization applications. Unlike general-purpose Brix refractometers, the PR-50HO employs a custom optical dispersion curve optimized for the refractive index–concentration relationship of H₂O₂ across the 0.0–50.0% (w/w) range. Its measurement principle relies on total internal reflection at the prism–sample interface; incident light undergoes angular deviation proportional to the solution’s refractive index, which is then converted to % H₂O₂ using an embedded polynomial calibration derived from gravimetric reference standards traceable to NIST-traceable protocols. Designed for use in aseptic packaging lines—including carton sterilization for UHT milk and soft drink containers—the instrument delivers repeatable results without requiring laboratory infrastructure or operator training in optical alignment.

Key Features

• Dedicated H₂O₂ scale with linearized output from 0.0 to 50.0% (w/w), eliminating manual conversion from Brix or RI units.
• Automatic Temperature Compensation (ATC) integrated into the sapphire-coated measuring prism, ensuring stable readings across 5–40°C ambient and sample temperature ranges—critical for production-floor environments where thermal drift compromises accuracy.
• High-contrast LCD display with backlight-independent contrast, readable under factory lighting or shaded outdoor conditions.
• Rugged, IP64-rated housing resistant to dust ingress and water splashes, validated for operation in humid cleanroom corridors and wet processing zones.
• Single-button operation: press START/ON to initiate measurement; result stabilizes within ≤3 seconds after sample application.
• No external calibration required during routine use—factory calibration remains stable over ≥12 months under typical handling, verified via optional ATAGO Calibration Check Liquid (Cat. No. 3825).

Sample Compatibility & Compliance

The PR-50HO is validated exclusively for clear, low-viscosity, non-particulate aqueous H₂O₂ solutions used in food and beverage aseptic packaging sterilization—such as those applied to polyethylene-coated paperboard cartons. It is not suitable for viscous formulations, emulsions, suspensions, or organic solvent-based H₂O₂ carriers. The instrument complies with ISO 21748:2017 (Guidance for the evaluation of measurement uncertainty in quantitative analysis) and supports GLP-aligned documentation when paired with ATAGO’s optional RS-232 data logging interface (cable Cat. No. 3821). While not certified to FDA 21 CFR Part 11, its fixed calibration architecture and absence of user-modifiable parameters facilitate audit readiness in GMP-regulated facilities where procedural controls govern instrument use.

Software & Data Management

The PR-50HO operates as a standalone optical sensor with no onboard memory or wireless connectivity. All measurements are displayed in real time and must be manually recorded. For traceability, ATAGO provides optional accessories: the RS-232 serial cable (Cat. No. 3821) enables direct connection to PCs running terminal emulation software (e.g., Tera Term) for ASCII-formatted output capture. Output format is standardized as “PR-50HO, [YYYY-MM-DD HH:MM:SS], [X.X]% H₂O₂”, supporting integration into LIMS or MES systems via simple text ingestion. No proprietary software installation is required, minimizing IT validation burden in regulated environments.

Applications

• Real-time verification of H₂O₂ bath concentration on aseptic filling lines prior to carton immersion.
• Quality control spot-checking of incoming H₂O₂ stock solutions before dilution.
• Validation of residual H₂O₂ removal efficacy during post-sterilization rinsing cycles.
• Process troubleshooting during concentration drift events linked to evaporation or decomposition in open tanks.
• Supplier qualification audits requiring on-site verification of delivered H₂O₂ titer against certificate of analysis.

FAQ

Can the PR-50HO measure other chemicals such as ethanol or sodium hydroxide?
No. The optical calibration is specific to hydrogen peroxide/water binary systems. Using it for other solutes introduces systematic bias exceeding ±5% error.
Does the instrument require periodic recalibration by the user?
No. Factory calibration is stable under normal operating conditions. Recalibration is only advised after mechanical shock, prism contamination, or exposure beyond 40°C ambient temperature.
Is the prism surface scratch-resistant?
Yes. The measuring prism is coated with synthetic sapphire (Mohs hardness 9), resistant to abrasion from standard cleaning wipes and glass rods.
What is the minimum sample volume required?
Only 0.3 mL is needed—typically 2–3 drops applied directly to the prism surface.
Can the battery be replaced in the field?
Yes. The 9V alkaline battery (IEC 6LR61, 006P) is user-replaceable without tools; battery life exceeds 5,000 measurements per set.