Jingxin JL-A303 Hall Flowmeter & Apparent Density Tester

Overview

The Jingxin JL-A303 Hall Flowmeter & Apparent Density Tester is a precision benchtop instrument engineered for standardized measurement of two critical powder physical properties: Hall flow rate (in seconds per 50 g) and apparent (bulk) density (in g/cm³). It operates on the principle of gravity-driven powder flow through calibrated orifices under controlled geometric conditions—specifically conforming to the core methodology of the Hall funnel test as defined in GB/T 1482–2010 and ASTM B213. The device implements a fixed-height, fixed-orifice configuration where powder mass, orifice diameter (2.5 mm or 5.0 mm), funnel angle (60°), and vertical drop distance (25 mm ± 2 mm) are rigorously maintained to ensure inter-laboratory reproducibility. Unlike dynamic or vibrated density testers, the JL-A303 measures static apparent density—a parameter essential for predicting die fill behavior in powder metallurgy, metal injection molding (MIM), and additive manufacturing (AM) feedstock qualification.

Key Features

• Regulatory-Aligned Geometry: Stainless steel 304 funnel with precision-machined 60° conical angle and polished internal surface minimizes wall friction and ensures laminar, repeatable flow—critical for compliance with GB/T 1482–2010 and ISO 4490:2018.
• Dual-Orifice Flexibility: Interchangeable 2.5 mm and 5.0 mm outlet nozzles allow testing across broad particle size distributions—from fine spherical AM powders (e.g., Ti-6Al-4V, Inconel 718) to coarser electrolytic copper or iron powders.
• Traceable Height Adjustment: Micrometer-style vertical positioning mechanism enables precise, repeatable setting of the 25 mm ± 2 mm funnel-to-cylinder gap—directly supporting the dimensional tolerance requirement of GB/T 1479.1–2011.
• Corrosion-Resistant Construction: All wetted components—including funnel, scraper blade (25 mm wide), stopper rod, and 25 mL volumetric cylinder—are fabricated from AISI 304 stainless steel, ensuring long-term dimensional stability and resistance to oxidation or chemical degradation during routine handling of reactive metal powders.
• Modular Workflow Design: Separated base plate, support column, funnel mount, and powder collection tray enable rapid setup, cleaning, and cross-contamination control—essential in multi-material QC labs serving battery cathode producers or pharmaceutical excipient developers.

Sample Compatibility & Compliance

The JL-A303 is validated for free-flowing, non-cohesive, dry particulate solids with median particle sizes typically ranging from 10 µm to 250 µm. It is routinely deployed for quality control of gas-atomized and water-atomized metal powders (Fe, Cu, Al, Ni, Co-based alloys), ceramic precursors (Al₂O₃, ZrO₂), and battery electrode materials (LiCoO₂, NMC, graphite anodes). While not intended for cohesive, hygroscopic, or electrostatically charged powders without preconditioning (e.g., drying, anti-static treatment), its geometry satisfies the scope definition of ASTM B213 and ISO 4490 for “metallic powders capable of flowing freely through a 2.5 mm orifice.” Data generated using this instrument supports GLP-compliant documentation when paired with calibrated external balances (0.02 g resolution) and traceable timekeeping devices (0.01 s resolution). The system does not incorporate electronic data logging; therefore, manual entry into LIMS or ELN systems must follow 21 CFR Part 11–compliant audit trail procedures if used in regulated environments.

Software & Data Management

The JL-A303 is a fully mechanical, operator-driven instrument with no embedded electronics, firmware, or proprietary software. All measurements—flow time (s) and filled-cylinder mass (g)—are recorded manually by the user. Calculations for Hall flow rate (50 g ÷ t, units: g/s) and apparent density (m / 25 mL, units: g/cm³) are performed externally using laboratory calculators, spreadsheets, or LIMS platforms. This architecture eliminates software validation requirements but mandates strict adherence to documented SOPs covering balance calibration, environmental controls (temperature: 20–25 °C; RH < 60%), and minimum triplicate measurement protocols per GB/T 1482–2010 Section 7.2 and GB/T 1479.1–2011 Section 6.3. Raw data sheets must include operator ID, date/time, ambient conditions, orifice size used, and individual replicate values prior to arithmetic averaging.

Applications

• Additive Manufacturing Feedstock Qualification: Screening incoming metal powders for consistency in flow rate and bulk density—key indicators of spherical morphology, surface oxide content, and interparticle friction.
• Powder Metallurgy Process Development: Correlating Hall flow data with green density uniformity in uniaxial pressing; identifying batch deviations affecting die fill efficiency.
• Battery Material QC: Monitoring apparent density shifts in cathode active materials (e.g., NMC811) that correlate with tap density, electrode coating weight consistency, and calendering response.
• Research on Powder Rheology: Serving as a first-tier screening tool prior to advanced dynamic powder rheometry (e.g., FT4, RST-XS) for comparative studies of surface modification or moisture conditioning effects.
• Third-Party Certification Labs: Supporting ISO/IEC 17025-accredited testing for powder suppliers requiring GB, ASTM, or ISO standard conformance reports.

FAQ

Is the JL-A303 compliant with international standards such as ASTM or ISO?

Yes—it is explicitly designed to meet the dimensional, material, and procedural requirements of ASTM B213, ISO 4490:2018, and GB/T 1482–2010 for Hall flow testing, and GB/T 1479.1–2011 for apparent density.
Does the instrument include a built-in balance or timer?

No. A high-precision balance (1000 g capacity, 0.02 g readability) and a stopwatch with 0.01 s resolution must be supplied separately by the user.
Can it measure tapped density?

No. The JL-A303 performs only apparent (loose) density via gravity-fed filling. Tapped density requires a separate tap density tester (e.g., ASTM D4781 or ISO 3953).
What maintenance is required?

Routine cleaning with lint-free wipes and isopropyl alcohol after each sample type; periodic inspection of funnel orifice for burrs or deformation using optical magnification; annual verification of funnel-to-cylinder distance with calibrated gauge blocks.
Is calibration certification provided with purchase?

The unit ships with a factory inspection report verifying dimensional conformity to GB/T 1482–2010. Formal metrological calibration (e.g., NIST-traceable) of the funnel geometry or cylinder volume requires third-party service and is not included.