Top Cloud-agri WZ-105 Portable Refractometric Saccharimeter

Overview

The Top Cloud-agri WZ-105 Portable Refractometric Saccharimeter is a field-deployable optical instrument engineered for rapid, on-site quantification of soluble solids content (SSC) in liquid and semi-liquid agricultural and food matrices—expressed as degrees Brix (% w/w sucrose equivalent). It operates on the principle of critical-angle refractometry: incident light passing through a prism-sample interface undergoes refraction proportional to the sample’s refractive index, which correlates linearly with dissolved sugar concentration under controlled temperature conditions. Unlike non-destructive near-infrared (NIR) or acoustic methods, the WZ-105 requires minimal sample preparation—typically a few drops of expressed juice or homogenized pulp filtrate—making it a destructive yet highly reproducible tool for quality control across fruit cultivation, post-harvest grading, and beverage formulation workflows. Its compact form factor (≤180 g), integrated ambient temperature sensor, and automatic digital compensation (±0.1 °C resolution) ensure measurement stability across variable environmental conditions—from orchard rows to processing line stations.

Key Features

• Optical path calibrated to ISO 2173:2003 and AOAC Official Method 932.12 for refractometric Brix determination
• Digital LCD display with backlight for low-light field use; auto-zero function prior to each measurement cycle
• Stainless steel sample stage and tempered glass prism resistant to acidic fruit juices and cleaning agents
• Automatic temperature compensation (ATC) spanning 10–40 °C, eliminating manual correction tables
• No external power source required—operates on two AAA batteries (≥10,000 measurements per set)
• IP65-rated enclosure for dust and water resistance during outdoor or humid facility deployment

Sample Compatibility & Compliance

The WZ-105 is validated for direct measurement of clarified fruit juices (e.g., apple, orange, grape), crushed berry pulps (post-filtration), syrups, jams, soft drink concentrates, soy sauce, tomato paste dilutions, and textile sizing solutions. It is not suitable for opaque suspensions, viscous pastes without dilution, or samples containing suspended particulates >50 µm unless pre-filtered (0.45 µm membrane). The instrument complies with GLP documentation requirements for field-based QC: each measurement stores timestamp, ambient temperature, and user ID (via optional Bluetooth pairing with TopCloud LabManager v3.2 software). While not FDA 21 CFR Part 11 compliant out-of-the-box, audit trails generated via paired software meet ISO/IEC 17025 traceability standards for accredited laboratories.

Software & Data Management

When connected via Bluetooth to the TopCloud LabManager desktop application (Windows/macOS), the WZ-105 enables batch export of CSV-formatted datasets including Brix value, temperature reading, measurement duration, and operator ID. The software supports statistical process control (SPC) charting—X-bar/R charts for harvest lot consistency—and automated report generation aligned with internal SOPs or third-party certification schemes (e.g., GlobalG.A.P., BRCGS Food Safety Issue 9). Raw data files are digitally signed and time-stamped, enabling retrospective verification of measurement integrity during regulatory audits.

Applications

• Determining optimal harvest timing by tracking Brix accumulation curves across cultivars and growing seasons
• Grading incoming fruit lots at packing houses using ASTM D7420-18-defined tolerance bands
• Monitoring sugar concentration drift during juice concentration or fermentation stages in winemaking and cider production
• Verifying formulation consistency of beverage concentrates prior to dilution and bottling
• Validating cleaning-in-place (CIP) rinse efficacy by detecting residual sugar carryover in pipelines
• Supporting R&D in breeding programs through high-throughput phenotyping of SSC heritability traits

FAQ

Is the WZ-105 suitable for measuring intact fruit without juicing?
No. As a destructive refractometer, it requires liquid-phase contact with the prism; solid fruit must be crushed and filtered to obtain representative juice.
Does it measure glucose or fructose specifically?
No. It reports total soluble solids as % Brix—a sucrose-equivalent value—not individual monosaccharide concentrations. For speciation, HPLC or enzymatic assays are required.
Can it be recalibrated in the field?
Yes. Two-point calibration (distilled water at 0% Brix and NIST-traceable 30% sucrose standard) is supported via dedicated calibration mode.
What is the measurement repeatability under controlled conditions?
±0.2% Brix (n=10, same operator, 25 °C ambient, standardized juice extract).
Is firmware upgradable?
Yes. Firmware updates are distributed quarterly via TopCloud’s secure portal and applied via USB-C connection.