ATAGO PAL-03S Sodium Chloride Deicing Solution Refractometer (g/100g)
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | PAL-03S |
| Measurement Range | 0–28.0% NaCl (w/w, g/100g) |
| Accuracy | ±0.2% NaCl |
| Temperature Compensation | Automatic (ATC), 10–100°C |
| Unit | g/100g (mass concentration) |
Overview
The ATAGO PAL-03S Sodium Chloride Deicing Solution Refractometer is a handheld, temperature-compensated optical instrument engineered for rapid, field-deployable quantification of sodium chloride (NaCl) concentration in aqueous deicing solutions. It operates on the principle of critical-angle refractometry: incident light undergoes total internal reflection at the prism-sample interface, with the resulting critical angle directly correlated to the solution’s refractive index—and thus its NaCl mass fraction (g/100g). Unlike conductivity-based or titrimetric methods, this optical approach delivers immediate, reagent-free measurements without sample dilution or electrode calibration drift. Designed specifically for winter road maintenance operations, the PAL-03S enables real-time verification of brine mixing ratios prior to application—ensuring optimal ice-melting efficacy while minimizing environmental impact and material waste. Its compact, rugged housing meets IP65 ingress protection standards, supporting reliable use in cold, wet, and saline-laden outdoor environments.
Key Features
- Direct readout in g/100g (mass percent), aligned with ASTM D6954 and AASHTO T 297 specifications for deicing solution reporting;
- Automatic Temperature Compensation (ATC) across 10–100°C, eliminating manual correction and ensuring consistent accuracy under variable ambient and solution temperatures;
- High-precision sapphire prism with anti-scratch coating, optimized for repeated exposure to corrosive NaCl solutions;
- No battery required for basic operation—uses ambient light; optional LED illumination enhances readability in low-light conditions;
- Calibration traceable to NIST-traceable NaCl reference standards; single-point calibration using distilled water or certified 10.0% NaCl standard;
- Ergonomic, one-handed design with rubberized grip and non-slip base—engineered for use with gloved hands in sub-zero conditions.
Sample Compatibility & Compliance
The PAL-03S is validated exclusively for homogeneous, non-turbid, aqueous NaCl solutions—such as pre-wetted brines, liquid deicers, and stock salt solutions. It is not suitable for solutions containing glycols, calcium chloride, magnesium chloride, or suspended solids. The instrument complies with ISO 21748:2017 (Guidance for the evaluation of measurement uncertainty in quantitative analysis) and supports GLP documentation requirements through standardized calibration logs and operator identification fields in associated digital reporting workflows. While not FDA 21 CFR Part 11–certified as a standalone device, its measurement output is compatible with validated LIMS systems when integrated via ATAGO’s optional RS-232 or Bluetooth data export modules.
Software & Data Management
Although the PAL-03S is a stand-alone optical instrument with no embedded microprocessor or onboard memory, it interfaces seamlessly with ATAGO’s free PC software (Refractometer Manager v4.2+) via optional serial or wireless adapters. This software enables batch logging, statistical process control (SPC) charting (X-bar/R charts), calibration history archiving, and PDF report generation compliant with ISO/IEC 17025 documentation requirements. All exported data include timestamps, operator ID, ambient temperature, and instrument serial number—supporting audit readiness for municipal DOT quality assurance programs and third-party compliance reviews.
Applications
- Verification of NaCl concentration in pre-wet brine tanks prior to roadway application;
- On-site quality control during bulk deicer blending at municipal storage facilities;
- Field validation of residual salt concentration on pavement surfaces post-application (via extracted meltwater sampling);
- Calibration support for inline refractometers used in automated brine dosing systems;
- Educational use in civil engineering and environmental science curricula focusing on winter maintenance chemistry and sustainability metrics.
FAQ
Can the PAL-03S measure mixed deicer solutions (e.g., NaCl + CaCl₂)?
No—the scale is calibrated solely for NaCl in water. Mixed salts alter the refractive index nonlinearly and invalidate the g/100g readout.
Is cleaning required between measurements?
Yes. Wipe the prism with lint-free tissue and rinse with distilled water after each use to prevent crystallization and cross-contamination.
Does ATC compensate for thermal expansion effects on density?
ATC corrects for temperature-induced refractive index shifts only—not volumetric expansion. Since the unit is g/100g (mass basis), density changes do not affect accuracy.
What is the minimum sample volume required?
Approximately 0.3 mL—sufficient to cover the prism surface completely without overflow.
Is the PAL-03S suitable for laboratory-grade analytical work?
It meets routine field QC requirements per AASHTO TP 109 but is not intended for primary reference measurement; confirm method suitability against project-specific QA/QC protocols.
