Brookfield PFT Powder Flow Tester
| Brand | Brookfield |
|---|---|
| Origin | USA |
| Model | PFT |
| Instrument Type | Powder Flow Tester |
| Measurable Parameters | Cohesive Strength, Internal Friction Angle, Wall Friction Angle |
| Vertical Load Range | 7 kg (±0.6% FSR) |
| Axial Speed | 0.1 mm/s (adjustable up to 1 mm/s) |
| Displacement Accuracy | ±0.3 mm |
| Torque Range | ±7.0 N·m (±1.2% FSR) |
| Hopper Rotation Speed | 1–5 rpm |
| Temperature Sensing | –20°C to 120°C |
| Humidity Sensing | 10–95% RH (±5% accuracy) |
| Dimensions (W×D×H) | 36.2 × 39.7 × 67.6 cm |
| Weight | 34 kg |
Overview
The Brookfield PFT Powder Flow Tester is a precision-engineered shear cell-based instrument designed for the quantitative characterization of bulk powder flow behavior under controlled consolidation and shear conditions. It operates on the fundamental principles of Jenike shear testing—applying vertical normal stress followed by controlled rotational shear to determine yield loci, flow functions, and wall friction relationships. Unlike empirical indices (e.g., angle of repose or compressibility), the PFT delivers physics-based, reproducible metrics essential for hopper design, silo specification, feeder selection, and process scale-up in pharmaceutical, chemical, food, and battery materials manufacturing. Its modular architecture enables both R&D-level mechanistic analysis and routine QC screening, supporting regulatory-compliant documentation workflows required under GMP and GLP environments.
Key Features
- Integrated axial loading and rotational shear mechanism with calibrated 7 kg normal force capability (±0.6% full-scale repeatability)
- Programmable shear rate control (1–5 rpm) and axial displacement speed (0.1–1 mm/s), enabling consistent shear history application across sample batches
- Real-time torque and displacement acquisition at ≥10 Hz sampling rate, ensuring high-fidelity yield locus construction
- Dual-sensor environmental monitoring: embedded PT100 temperature probe (–20°C to 120°C) and capacitive RH sensor (10–95% RH, ±5% accuracy)
- Modular shear cell kits (PFT-610: 263 cm³ standard volume; PFT-620: 43 cm³ low-volume option) with interchangeable 304 stainless steel wall surfaces (Ra ≈ 2B finish) for wall friction calibration
- Pre-configured test protocols—including 25-minute comprehensive flow function analysis, time consolidation studies, and rapid QA/QC flow index determination
- Compliance-ready data structure with timestamped metadata, operator ID fields, and audit-trail-capable export logs
Sample Compatibility & Compliance
The PFT accommodates free-flowing to highly cohesive powders ranging from nanoscale API particles to granular excipients and cathode active materials. Sample preparation follows ASTM D6393 “Standard Test Method for Flow Properties of Powders Using the Shear Cell” and aligns with ISO 4762 (powder rheology terminology) and USP <1174> “Powder Flow and Density.” All hardware components meet CE/UL safety directives. When operated with Powder Flow Pro software configured for 21 CFR Part 11 compliance (electronic signatures, user access tiers, and immutable audit trails), the system satisfies FDA-regulated environments for pharmaceutical process validation and quality assurance documentation.
Software & Data Management
Powder Flow Pro is a Windows-native application (compatible with Windows 7–10, 2 GHz CPU, 1 GB RAM, USB/RS-232 interface) that automates test execution, real-time curve visualization, and standardized reporting. It calculates critical parameters—including unconfined yield strength (fc), major principal stress (σ₁), flow function (ffc), internal friction angle (φ), wall friction angle (δ), and hopper half-angle (θmin)—using established Jenike methodology. Raw data exports directly to CSV or Excel formats with full traceability: each dataset includes instrument serial number, environmental readings, operator ID, date/time stamps, and raw torque/displacement arrays. Report templates conform to internal SOPs and external regulatory submissions, supporting PDF generation with embedded graphs, statistical summaries, and pass/fail thresholds.
Applications
- Hopper and silo design validation via hopper half-angle and arching dimension calculations
- Feeder performance prediction using measured flow function and consolidation stress profiles
- Batch-to-batch consistency monitoring for excipient blends, micronized APIs, or lithium-ion cathode powders
- Excipient compatibility assessment through comparative wall friction analysis against stainless steel, polymer, or coated surfaces
- Process troubleshooting—e.g., bridging, ratholing, or inconsistent discharge rates—in tablet compression, capsule filling, or continuous manufacturing lines
- Stability evaluation of moisture-sensitive powders via time-consolidation tests under controlled RH conditions
FAQ
What standards does the PFT comply with?
The PFT implements shear testing methodologies aligned with ASTM D6393, ISO 4762, and USP <1174>. With appropriate software configuration, it supports 21 CFR Part 11 compliance for electronic records and signatures.
Can the PFT measure wall friction against non-stainless-steel surfaces?
Yes—custom wall inserts (e.g., anodized aluminum, HDPE, or electropolished titanium) can be fabricated to match process equipment materials; contact Brookfield Applications Engineering for qualification protocols.
Is calibration traceable to NIST standards?
All load cells and torque sensors are factory-calibrated with NIST-traceable reference standards, and calibration certificates are supplied with each instrument.
How long does a full flow function test take?
A complete 5-point flow function test—including consolidation, shearing, and data reduction—requires approximately 25 minutes per sample, depending on selected consolidation stress levels and dwell times.
Does the system support automated data archiving?
Powder Flow Pro supports scheduled backups to network drives or cloud storage via Windows Task Scheduler; all exported files retain full metadata for long-term archival integrity.
