GuanCe Instruments ZKMD-25571b Bulk Density Tester for Activated Clay

Overview

The GuanCe Instruments ZKMD-25571b Bulk Density Tester is a precision-engineered, portable instrument designed specifically for the standardized determination of bulk density in free-flowing powdered materials—particularly activated clay (activated bleaching earth), a critical functional additive in food processing, edible oil refining, and pharmaceutical excipient purification. Based on the principle of gravitational volumetric filling under controlled geometry, the device implements a standardized funnel-and-cylinder method: powder flows freely from a fixed-height conical funnel into a calibrated cylindrical cup of known volume (typically 100 mL per ASTM D1895 and GB/T 25571–2010). After manual leveling with a straightedge, the mass of the leveled sample is measured using an integrated high-resolution balance, and bulk density is calculated as mass per unit volume (g/cm³). This gravimetric method reflects real-world handling behavior—including aeration, particle cohesion, and interstitial void fraction—and is distinct from true (helium pycnometry) or tapped density measurements. The ZKMD-25571b is not a general-purpose densitometer; it is a dedicated, geometry-controlled bulk density apparatus compliant with static, non-compacted powder characterization protocols.

Key Features

• Optimized mechanical alignment system: Integrated spirit level and coaxial positioning fixtures ensure precise vertical alignment between funnel outlet and cylinder centerline—minimizing flow asymmetry and wall effects that compromise reproducibility.
• Calibrated volumetric cylinder: Stainless steel measurement cup with certified internal volume (100.00 ± 0.05 mL), traceable to national metrological standards.
• Dual-function digital balance: Built-in 20 g capacity analytical balance with 0.01 g resolution and ±0.001 g repeatability, internally temperature-compensated for stability across 0–40 °C ambient range.
• Standard-compliant funnel geometry: Conical brass funnel (60° apex angle, 2.5 mm orifice diameter) conforming to GB/T 25571–2010, HG/T 2764–2008, and GB/T 23771–2009 dimensional specifications.
• Modular, benchtop-portable architecture: Compact footprint (320 × 220 × 410 mm) with anti-vibration base plate; no external power supply required beyond standard USB-C or optional AC adapter.
• Material compatibility: All wetted parts constructed from corrosion-resistant stainless steel and anodized aluminum—suitable for acidic, alkaline, and low-moisture industrial powders including activated clays, sodium percarbonate, catalyst supports, and ceramic precursors.

Sample Compatibility & Compliance

The ZKMD-25571b is validated for use with dry, free-flowing, non-cohesive to moderately cohesive powders having particle sizes between 10 µm and 2 mm. It is explicitly referenced in three major Chinese national and industrial standards: GB/T 25571–2010 (Food Additives – Activated Clay), HG/T 2764–2008 (Sodium Percarbonate), and GB/T 23771–2009 (Inorganic Chemical Products – Determination of Bulk Density). While not certified to ISO 3953 or ASTM D1895 by default, its geometric and procedural conformity enables direct correlation with those international methods when operated under identical environmental controls (23 ± 2 °C, 50 ± 5 % RH) and operator training. The instrument supports GLP-aligned documentation through external data logging; full 21 CFR Part 11 compliance requires integration with validated third-party LIMS or ELN software.

Software & Data Management

The ZKMD-25571b operates as a standalone hardware platform with no embedded firmware or proprietary software. Density calculations are performed manually or via user-supplied spreadsheets (e.g., Excel templates preconfigured with GB/T 25571 calculation logic). All measurement data—including mass readings, ambient temperature, operator ID, and test date/time—must be recorded externally. Optional USB data export (via RS-232/USB converter) supports ASCII-formatted mass logs compatible with CSV ingestion into laboratory information management systems (LIMS) or statistical process control (SPC) platforms. Audit trails, electronic signatures, and automated report generation require integration with validated enterprise software—no onboard memory or user authentication is provided.

Applications

• Quality control of activated clay batches in edible oil refining plants, verifying consistency in decolorization efficiency and filtration performance.
• Raw material release testing for food-grade bentonite and acid-activated montmorillonite per GB/T 25571–2010 compliance.
• Process validation of sodium percarbonate granulation in detergent manufacturing (HG/T 2764–2008).
• Benchmarking bulk density shifts during catalyst support calcination or drying cycles in fine chemical synthesis.
• Routine assessment of flowability and compressibility indices in pharmaceutical excipient qualification (ICH Q5C supporting data).
• Research-scale screening of nanoparticle agglomeration behavior under varying humidity or surface treatment conditions.

FAQ

Is the ZKMD-25571b suitable for measuring tapped density?

No. This instrument implements only the *free-settled* (untapped) bulk density method per GB/T 25571–2010. Tapped density requires mechanical vibration or standardized tapping mechanisms per ISO 3953 or USP <616>.
Does it comply with FDA requirements for food contact materials?

The device itself is not subject to FDA clearance; however, its methodology is cited in GB/T 25571–2010, which aligns with Codex Alimentarius GSFA provisions for activated clay as a processing aid. Final regulatory acceptance depends on facility-level validation and documentation.
Can it measure slurries or pastes?

No. The ZKMD-25571b is strictly intended for dry, pourable powders. Slurry density requires hydrostatic weighing or inline ultrasonic densitometry.
What calibration certificates are supplied?

A factory-issued certificate of conformance for cylinder volume (traceable to CNAS-accredited lab) and balance linearity verification (±0.01 g at 20 g) are included. Periodic recalibration of the balance is recommended every 6 months under ISO/IEC 17025 guidelines.
Is technical support available in English?

Yes—application engineering support and method consultation are provided in English for international customers; documentation includes bilingual (EN/CN) operating instructions and standard interpretation guides.