PSS AccuSizer 7000 Online Particle Size Analyzer

Overview

The PSS AccuSizer 7000 Online Particle Size Analyzer is an industrial-grade, in-process particle characterization system engineered for continuous, real-time monitoring of dispersed phase stability in liquid suspensions and colloidal formulations. Leveraging Single Particle Optical Sensing (SPOS) technology—distinct from ensemble methods such as laser diffraction—the instrument detects and sizes individual particles passing through a precisely defined optical sensing zone. This enables high-resolution, statistically robust counting of particles in the 0.5–400 µm range with exceptional sensitivity to low-abundance submicron and micron-scale contaminants or agglomerates. Unlike offline batch analysis, the 7000 Online integrates directly into production loops via sanitary or process-compatible wetted-path interfaces, delivering traceable, time-stamped size distribution data synchronized with process parameters. Its design targets applications where particle count, oversized particle presence, and dispersion consistency directly impact product safety, efficacy, or regulatory compliance—particularly in pharmaceutical parenterals, biologics fill-finish lines, semiconductor slurries, and high-value coatings.

Key Features

• Integrated automated dilution module: Dynamically adjusts sample concentration in real time to maintain optimal particle flux across the SPOS sensor, eliminating manual intervention and enabling stable measurement across variable feed concentrations (e.g., undiluted process streams up to 10⁶ particles/mL).
• Time-scheduled in-line sampling: Programmable sampling intervals (1 min to 24 h) with per-cycle purge-and-rinse protocol to prevent carryover and ensure measurement repeatability between cycles.
• Real-time alarm logic engine: Configurable thresholds for particle counts per size bin (e.g., >5 particles >10 µm in 1 mL), triggering audible/visual alerts and optional PLC or SCADA integration via digital I/O or Modbus TCP.
• Concentration-referenced data reconstruction: Raw SPOS counts are mathematically scaled back to original process concentration using dilution factor metadata, ensuring comparability with laboratory reference measurements (e.g., AccuSizer 780 APS benchtop data).
• Ruggedized optical path: Sealed flow cell with sapphire windows and temperature-stabilized LED illumination ensures long-term photometric stability under ambient plant conditions (15–40 °C, non-condensing).
• Modular wetted materials: Standard 316L stainless steel and PEEK fluidic path; optional EPDM, Viton, or Kalrez seals available for aggressive solvents or high-pH environments.

Sample Compatibility & Compliance

The AccuSizer 7000 Online accommodates aqueous and organic dispersions with viscosity ≤ 50 cP and solids content ≤ 20% w/w. It supports Newtonian and mildly shear-thinning systems typical of polymer emulsions, ceramic slurries, and protein-based formulations. All firmware and data handling modules comply with foundational requirements for regulated environments: audit trail logging (user actions, method changes, calibration events), electronic signature support (when paired with validated LIMS or ELN), and raw data export in CSV and ASTM E2917-compliant formats. While the base hardware meets IP65 enclosure rating and CE/UL safety standards, full 21 CFR Part 11 compliance requires deployment with PSS’s validated AccuSizer IQ software suite and documented system qualification (IQ/OQ/PQ).

Software & Data Management

Data acquisition and visualization are managed via the web-based AccuSizer Control Center (ACC) interface, accessible via secure HTTPS on any modern browser. ACC provides live histogram overlays, trend charts of D10/D50/D90 and total particle count over time, and configurable report templates aligned with internal SOPs. All measurement metadata—including dilution ratio, sampling timestamp, flow rate, and sensor health diagnostics—is embedded in each exported dataset. Historical data is stored locally on an industrial SSD (optional RAID-1 redundancy) with automatic rollover and encrypted backup to network shares. For enterprise integration, RESTful API endpoints enable bidirectional communication with MES or PI System platforms, supporting automated release decisions based on predefined particle quality gates.

Applications

• Pharmaceutical final-fill monitoring: Detection of silicone oil droplets, glass delamination fragments, or protein aggregates in vials or syringes pre-sterilization.
• Bioprocess clarification validation: Real-time tracking of residual cell debris or host-cell protein aggregates post-centrifugation or depth filtration.
• Electrolyte slurry QC in battery manufacturing: Monitoring graphite or cathode particle deagglomeration stability during mixing and storage.
• Chemical mechanical polishing (CMP) slurry control: Ensuring consistent abrasive particle size distribution to minimize wafer scratching.
• Paint & coating formulation: Early detection of pigment flocculation or resin phase separation during bulk storage or transfer.

FAQ

How does the automated dilution system maintain measurement accuracy across varying process concentrations?
The system uses a dual-piston metering pump calibrated against NIST-traceable standards to deliver precise diluent volumes. Flow sensors continuously verify dilution ratio, and the software applies real-time correction factors to raw counts before reconstructing the original concentration distribution.
Can the 7000 Online replace laboratory particle testing entirely?
It is designed for trend monitoring and early fault detection—not absolute metrological equivalence. Benchtop instruments (e.g., AccuSizer 780 APS) remain required for method validation, reference standards, and regulatory submission data.
What maintenance is required for uninterrupted operation?
Daily visual inspection of inlet filters; monthly cleaning of the flow cell with recommended solvents; annual recalibration of the dilution pump and optical alignment verification by certified PSS field service engineers.
Is the system compatible with hazardous area classifications (e.g., Class I Div 1)?
The standard unit is rated for general-purpose industrial use. Explosion-proof variants (ATEX/IECEx) are available under custom engineering order with modified enclosure and intrinsically safe signal conditioning.