YDWG WZB-HN1 Portable Digital Refractometer

Overview

The YDWG WZB-HN1 Portable Digital Refractometer is an optical measurement instrument engineered for precision and field-deployable reliability in quality control and process verification environments. It operates on the fundamental principle of critical angle refractometry: incident light passes through a high-grade optical prism in contact with a small liquid sample (typically one drop), and the resulting refraction angle is measured to determine the sample’s refractive index (RI). This RI value is then algorithmically converted—using built-in calibration curves compliant with internationally recognized empirical correlations—into multiple concentration units including Brix (%w/w sucrose equivalent), Baumé degree (°Bé), and moisture content per the IHC2002 standard for honey analysis. Designed specifically for apicultural and high-sugar liquid applications, the WZB-HN1 targets the elevated RI range of 1.4370–1.5233, corresponding to dense, viscous matrices such as raw honey, concentrated syrups, and floral nectars where conventional low-range refractometers lack resolution or linearity.

Key Features

• High-resolution digital LCD display with automatic 3-second measurement response time—eliminating parallax error and subjective scale interpretation inherent in analog Abbe-type instruments.
• Integrated automatic temperature compensation (ATC) across 10–40 °C, utilizing a precision thermistor embedded in the prism block to correct RI readings in real time per ISO 2173 and AOAC 932.12 standards.
• Dual-unit temperature display (°C/°F) with configurable output, supporting international lab documentation requirements and multi-regional operational use.
• Extended service life: rated for ≥10,000 measurement cycles; robust aluminum-magnesium alloy housing with IP65-rated ingress protection against dust and incidental water exposure.
• Intelligent power management including low-battery warning, auto-power-off after 3 minutes of inactivity, and CR2032 coin-cell battery operation (typical service life >12 months at 50 measurements/day).

Sample Compatibility & Compliance

The WZB-HN1 is validated for direct measurement of undiluted, non-turbid aqueous sugar solutions with viscosity ≤500 mPa·s and particulate content <5 ppm. It is routinely employed in honey grading per Codex Alimentarius STAN 12-1981, EU Directive 2001/110/EC, and national standards including GB 14963–2014 (China) and USDA Honey Grading Manual. The instrument conforms to general metrological requirements outlined in ISO/IEC 17025 for in-house calibration traceability, and its ATC algorithm adheres to the temperature coefficient model specified in ASTM D1218–19 (Standard Test Method for Refractive Index of Hydrocarbon Liquids). While not FDA 21 CFR Part 11–compliant out-of-the-box (as it lacks audit trail or user authentication), its measurement data may be recorded manually or via external logging systems compliant with GLP/GMP documentation protocols.

Software & Data Management

The WZB-HN1 is a standalone, firmware-based instrument with no Bluetooth, USB, or PC connectivity. All calibrations—including factory-default and user-defined offset adjustments—are stored in non-volatile memory. Calibration verification is performed using certified NIST-traceable sucrose reference standards (e.g., 60.00 ± 0.02% Brix at 20 °C). While no proprietary software is provided, measurement outputs are fully compatible with LIMS integration when transcribed into structured spreadsheets or CSV files. The device supports manual calibration using distilled water (RI = 1.3330 at 20 °C) and a second-point check with a certified honey standard, satisfying internal QA requirements under ISO 9001 Clause 7.1.5.

Applications

• Honey quality assessment: Determination of moisture content (IHC2002), Brix, and Baumé for compliance with maximum 20% moisture thresholds in commercial honey.
• Apiary field testing: Rapid on-site verification of nectar concentration prior to extraction and storage.
• Food processing QC: Monitoring syrup density in confectionery, jam, and marmalade production lines.
• Research laboratories: Screening of plant exudates, floral nectars, and osmotic stress responses in botany and entomology studies.
• Regulatory inspection: Supporting official controls by national food safety authorities during market surveillance of honey adulteration.

FAQ

What calibration standards are recommended for routine verification?
Distilled water (RI = 1.3330 at 20 °C) for zero-point check; a certified 60.00% Brix sucrose solution or NIST-traceable honey reference material for span verification.
Can the WZB-HN1 measure samples below 58% Brix?
It is technically capable but not optimized—accuracy degrades outside its designated 58–92% Brix range due to reduced signal-to-noise ratio and nonlinear RI–concentration mapping in dilute solutions.
Is cleaning the prism required between measurements?
Yes—use lens tissue and reagent-grade isopropanol; avoid abrasive cloths or acetone, which may damage the anti-reflective coating.
Does the instrument comply with ISO 2173 for fruit juice analysis?
No—ISO 2173 specifies 0–35% Brix range and 20 °C thermostatted measurement; the WZB-HN1 is purpose-built for high-Brix honey and does not meet that standard’s scope or temperature control requirements.
How is moisture content calculated from RI in honey?
Using the IHC2002 polynomial equation (published by the International Honey Commission), which correlates RI at 20 °C to water mass fraction with ±0.1% repeatability under controlled ambient conditions.