Potable & Ultra-Pure Liquid Particle Counter PMT-2QY by PULUODY

Overview

The PULUODY PMT-2QY Potable & Ultra-Pure Liquid Particle Counter is an optical particle counter engineered for high-sensitivity, real-time particulate contamination monitoring in demanding liquid media—particularly potassium hydroxide (KOH) solutions, semiconductor process chemicals, ultrapure water (UPW), electronic cleaning agents, and other aggressive or low-conductivity aqueous and organic solvents. It operates on the principle of dual-laser narrow-beam light scattering, where two spatially separated laser sources (typically 405 nm and 635 nm) illuminate particles sequentially within a laminar flow cell, enabling enhanced signal discrimination, reduced coincidence error, and improved sizing resolution in sub-micron regimes. Unlike conventional single-wavelength counters, this eighth-generation sensor architecture minimizes Mie scattering artifacts and improves detection fidelity for non-spherical or refractive-index-variable contaminants common in KOH etchants, CMP slurries, and nanofiltration effluents. The instrument supports both online continuous monitoring and offline portable analysis, fulfilling critical requirements for GMP-compliant pharmaceutical water systems, ISO Class 1–5 cleanroom UPW loops, and front-end semiconductor fab chemical delivery networks.

Key Features

• Dual-laser narrow-beam optical detection system with independent wavelength channels for improved size resolution and refractive index compensation
• Precision dual-stage fluidic control: high-stability metering piston pump combined with ultra-fast electromagnetic flow regulation (<±1% volumetric accuracy)
• Real-time, continuous online sampling capability with integrated 4–20 mA analog output and programmable contamination threshold alarms
• Configurable detection thresholds: standard 0.1–0.5 µm range; optional extended ranges (1–100 µm or 4–70 µm(c)) with user-defined counting channels
• V8.3 Integrated Software Suite supporting simultaneous analysis, calibration traceability, and audit-ready reporting—fully compliant with FDA 21 CFR Part 11 data integrity requirements
• Touchscreen HMI with wireless keyboard/mouse support; fully isolated wetted path constructed from chemically resistant materials (e.g., sapphire flow cell, PFA/ETFE tubing)
• Calibration traceable to NIST-certified latex standards and certified per JJG 1061 and ISO 21501-4 for metrological validity

Sample Compatibility & Compliance

The PMT-2QY is validated for use with highly caustic liquids—including concentrated KOH solutions (up to 50% w/w), TMAH, ammonium hydroxide, and organic solvents such as IPA and PGMEA—without sensor degradation or flow path corrosion. Its wetted materials meet USP Class VI biocompatibility and SEMI F57 chemical compatibility standards. Regulatory alignment includes ISO 4406:2017 (hydraulic fluid cleanliness), ISO 14644-1 (cleanroom airborne particle limits extrapolated to liquid phase), USP and for injectable-grade water particulate testing, and ASTM F3239 for semiconductor process chemical purity verification. All measurement records include full metadata (timestamp, operator ID, calibration status, environmental conditions) to support GLP/GMP audits and internal quality system documentation.

Software & Data Management

PULUODY V8.3 software provides a modular, role-based interface for calibration management, method setup, real-time trend visualization, and automated report generation. Calibration workflows enforce separation between analysis execution and calibration parameter modification—preventing inadvertent configuration drift during routine operation. Raw scatter pulse data is stored in vendor-neutral HDF5 format, enabling third-party reprocessing and statistical validation. Audit trails log all user actions, parameter changes, and calibration events with immutable timestamps and digital signatures. Export options include CSV, PDF, and XML formats compatible with LIMS integration (e.g., LabWare, Thermo Fisher SampleManager). Remote diagnostics and firmware updates are supported via secure TLS-encrypted Ethernet connection.

Applications

• In-line monitoring of KOH-based silicon wafer etching baths to detect slurry agglomeration or chamber shedding
• Continuous UPW loop surveillance in semiconductor fabs per SEMI F63 specifications
• Final rinse water qualification for photomask and flat-panel display manufacturing
• Particulate release testing of medical device packaging materials in saline or buffer solutions
• Stability assessment of nanoparticle suspensions in polymer electrolytes and battery electrolyte formulations
• Validation of nanofiltration and ultrafiltration membrane integrity during pharmaceutical water system commissioning

FAQ

Is the PMT-2QY suitable for measuring particles in 45% w/w KOH solution at 80°C?
Yes—the flow cell and wetted components are rated for sustained exposure to ≥50% KOH at temperatures up to 85°C, with thermal expansion compensation embedded in the optical alignment algorithm.
Can it be integrated into a SCADA system for centralized factory monitoring?
Yes—via native 4–20 mA analog output, Modbus TCP/IP, and OPC UA protocol support (optional module), enabling seamless integration with Siemens PCS7, Rockwell FactoryTalk, or Yokogawa CENTUM VP.
Does the system comply with FDA 21 CFR Part 11 for electronic records?
Yes—V8.3 software implements full electronic signature enforcement, audit trail retention (≥10 years), and role-based access control aligned with Part 11 Annex 11 expectations.
What calibration standards are included with shipment?
Each unit ships with NIST-traceable 0.1 µm, 0.3 µm, and 0.5 µm polystyrene latex standards (PSL), plus a full calibration certificate compliant with ISO/IEC 17025 through CNAS-accredited partner labs.
How is coincidence error managed at high particle concentrations?
The dual-laser temporal gating and adaptive pulse-height discrimination reduce coincidence error to ≤2.5% at 1000 particles/mL; optional dilution module (PULUODY DM-100) extends dynamic range to 10⁶ particles/mL.