BM Optical Handheld Refractometer BM-FG116

Overview

The BM Optical Handheld Refractometer BM-FG116 is a precision analog optical instrument engineered for rapid, field-deployable assessment of soluble solids concentration in liquid samples—primarily honey, syrups, fruit juices, and other high-sugar aqueous solutions. Based on the principle of critical angle refraction, the device measures the refractive index of a sample and correlates it to standardized concentration scales (Brix, Baumé, and water content) via calibrated internal prisms and etched optical scales. Its design adheres to classical Abbe refractometer optics, utilizing total internal reflection at the prism-sample interface to generate a sharp shadow line visible through the eyepiece. No external power source or digital electronics are required, ensuring operational reliability under ambient laboratory, apiary, or warehouse conditions.

Key Features

• Large, optically optimized viewing field with high-contrast scale illumination for unambiguous visual interpolation—even under variable ambient lighting
• Integrated automatic temperature compensation (ATC) mechanism covering 10–30 °C, minimizing manual correction errors for samples within typical storage and processing environments
• Triple-scale engraved reticle displaying % Brix (58–92), degrees Baumé (38–43), and % water content (12–27) simultaneously—enabling cross-unit verification without recalibration
• Compact cylindrical form factor (Ø29 mm × 148 mm) and lightweight construction (175 g) for extended handheld use and portability across inspection points
• Robust all-metal body with corrosion-resistant aluminum alloy housing and scratch-resistant optical glass prism surface
• Calibration-ready design compatible with standard sucrose reference solutions (e.g., 58% and 92% Brix) per ISO 2173:2003 guidelines for routine verification

Sample Compatibility & Compliance

The BM-FG116 is validated for use with clear to mildly turbid aqueous sugar solutions exhibiting low viscosity and minimal suspended particulates. It is routinely applied in honey quality control per national standards (e.g., GB 14963–2014 in China) and aligns with internationally recognized methodologies referenced in AOAC Official Method 932.12 and IDF Standard 119A for honey analysis. While not intended for regulatory submission-grade documentation, its measurement traceability supports preliminary screening, lot release decisions, and process consistency monitoring in accordance with GLP-aligned workflows. The absence of electronic components eliminates electromagnetic interference concerns and ensures compliance with intrinsically safe environments where battery-powered instrumentation is restricted.

Software & Data Management

This is a fully analog, non-digital instrument; no software, drivers, or data export capabilities are included or required. All readings are interpreted visually by trained personnel using the ocular scale. For auditability, users may document results manually in laboratory notebooks or integrate measurements into LIMS via secondary entry. The device does not support FDA 21 CFR Part 11-compliant electronic records, nor does it provide audit trails, user authentication, or data encryption—consistent with its classification as a Class I passive optical measuring tool under IEC 61010-1 safety requirements.

Applications

• Routine honey grading and adulteration screening based on Brix and water content correlation
• Field verification of syrup concentration during food manufacturing and bottling operations
• Quality assurance checks for fruit nectars, molasses, and maple sap prior to evaporation
• Educational demonstrations of optical refraction principles in chemistry and food science curricula
• On-site validation of cleaning solution concentrations in CIP systems (where applicable to sucrose-based detergents)
• Pre-harvest assessment of fruit juice maturity in orchard settings

FAQ

Is the BM-FG116 suitable for measuring alcoholic beverages or high-ethanol solutions?
No. Ethanol significantly alters refractive index behavior outside the calibration envelope. This instrument is optimized for sucrose-water systems only.
Does it require periodic factory recalibration?
No. Users perform daily verification using certified sucrose standards. Full recalibration is unnecessary unless physical damage to the prism or scale occurs.
Can it measure viscous or particulate-laden samples like raw honey with pollen?
Clarified or filtered samples are required. Undissolved solids scatter light and distort the shadow line; centrifugation or filtration is recommended prior to measurement.
What is the typical measurement repeatability under controlled conditions?
±0.5% Brix (at 20 °C), consistent with ISO 2173:2003 reproducibility limits for handheld analog refractometers.
Is the ATC mechanism adjustable or user-serviceable?
No. The bimetallic ATC element is factory-integrated and sealed; it requires no maintenance or adjustment throughout the instrument’s service life.