ATAGO PAL-HIKARi 12 Non-Destructive Pear Refractometer
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Instrument Type | Non-Destructive |
| Model | PAL-HIKARi 12 |
| Category | Optical Refractometer for Soluble Solids Measurement (Brix) |
Overview
The ATAGO PAL-HIKARi 12 is a specialized non-destructive optical refractometer engineered for rapid, in-situ Brix (°Bx) measurement of intact pears and other thin-skinned fruits without tissue penetration or sample preparation. It operates on the principle of near-infrared (NIR) light absorption spectroscopy—specifically calibrated to the 940 nm wavelength band—where absorption intensity correlates linearly with sucrose concentration in the fruit’s cortical tissue. Unlike conventional prism-based refractometers requiring juice extraction, the PAL-HIKARi 12 employs a patented optical coupling interface that maintains consistent contact pressure and alignment on curved, heterogeneous fruit surfaces while minimizing ambient light interference. Its measurement range spans 8.0–20.0 °Bx with an instrument repeatability of ±0.2 °Bx under controlled environmental conditions (20–30 °C, <70% RH), making it suitable for field-deployable quality assessment during harvest, post-harvest sorting, and breeding trials.
Key Features
- Non-invasive measurement: No skin puncture, no juice expression—preserves fruit integrity for shelf-life and export compliance testing.
- Dedicated pear calibration: Factory-calibrated using over 500 reference pear samples (varieties including Kosui, Nijisseiki, and Hosui) across multiple growing seasons and maturity stages.
- Integrated temperature compensation: Built-in thermistor monitors fruit surface temperature in real time and applies ISO 2173:2003-compliant correction algorithms to Brix readings.
- Ergonomic handheld design: IP65-rated enclosure, rubberized grip, and angled optical head optimized for vertical fruit orientation and operator fatigue reduction during high-throughput field use.
- Auto-zero function: Compensates for minor optical drift caused by lens contamination or thermal stabilization lag prior to each measurement cycle.
Sample Compatibility & Compliance
The PAL-HIKARi 12 is validated for intact, mature pears with skin thickness between 0.3–0.8 mm and surface curvature radius ≥25 mm. It is not intended for apples, citrus, or stone fruits due to differing optical scattering properties and cuticle composition. The device complies with IEC 61000-4-2 (ESD immunity), JIS Z 8806:2015 (refractometric terminology and metrological traceability), and supports GLP documentation workflows via optional CSV export. While not FDA 21 CFR Part 11-certified out-of-the-box, audit-ready data logs—including timestamp, GPS coordinates (via Bluetooth pairing), operator ID, and raw spectral signature metadata—can be integrated into validated LIMS environments.
Software & Data Management
Measurements are stored internally (up to 1,000 records) with UTC timestamps and automatically synchronized to ATAGO’s free PC application “PAL-Link” via USB-C. The software enables batch statistical analysis (mean, SD, CV%, histogram distribution), custom report generation (PDF/Excel), and comparative trend mapping across orchards or harvest dates. All data files include embedded digital signatures compliant with ISO/IEC 17025:2017 Clause 7.8.2 requirements for result integrity. Firmware updates are delivered through signed binary packages verified via SHA-256 checksums to ensure cryptographic integrity.
Applications
- On-tree ripeness monitoring in commercial pear orchards to optimize harvest scheduling and reduce post-harvest losses.
- Pre-export quality screening at packinghouses to meet EU Regulation (EC) No 1129/2012 and USDA Grade Standards for Brix minimum thresholds.
- Plant breeding programs quantifying sugar accumulation kinetics across progeny lines under controlled irrigation and nutrient regimes.
- Academic horticultural research investigating genotype × environment interactions affecting carbohydrate partitioning in Rosaceae fruit.
- Contract farming verification where Brix values serve as contractual delivery metrics tied to pricing tiers.
FAQ
Can the PAL-HIKARi 12 measure other fruits besides pears?
No—it is optically and algorithmically tuned exclusively for pear epidermis and mesocarp optical properties. Cross-application to apples or kiwifruit yields non-linear bias exceeding ±1.5 °Bx and is not supported.
Does surface moisture affect measurement accuracy?
Yes. Fruit must be wiped dry prior to measurement; residual water film causes total internal reflection loss and systematic underestimation. A lint-free cellulose wipe is included in the standard kit.
Is calibration verification required before daily use?
ATAGO recommends verifying against the supplied 12.0 °Bx sucrose reference standard at start-up and after every 50 measurements in field conditions. Full recalibration requires return to an ATAGO-accredited service center.
What is the operational battery life?
With alkaline AA batteries, continuous operation lasts ≥8 hours; lithium AA batteries extend this to ≥12 hours. Low-battery indication activates at ≤1.1 V per cell.
How is measurement repeatability ensured across operators?
The device enforces standardized contact force (1.2 ± 0.1 N) via spring-loaded optical head and provides audible feedback upon achieving optimal coupling—minimizing inter-operator variability per ISO 5725-2:1994 guidelines.
