PULUODY PMT-2 Wipe Material Liquid Particle Counter

Overview

The PULUODY PMT-2 Wipe Material Liquid Particle Counter is a high-precision optical liquid particle counter engineered for quantitative assessment of insoluble particulate contamination in low-conductivity and non-aqueous liquids used in ultra-clean manufacturing environments. It operates on the principle of dual-laser narrow-beam light scattering—where two spatially separated laser sources illuminate the sample flow path to minimize signal ambiguity from transient optical noise or refractive index fluctuations. This eighth-generation sensor architecture enables robust discrimination of sub-100 nm particles in challenging matrices such as semiconductor cleaning solvents, deionized water, photoresist developers, and polymer-based coating solutions. Designed specifically for wipe material qualification and cleanroom consumables validation, the PMT-2 supports both offline batch analysis and online continuous monitoring configurations, making it integral to contamination control programs aligned with ISO 14644-1, IEST-G-CC1002, and SEMI F37 standards.

Key Features

• Dual-laser narrow-beam optical detection system with independent wavelength alignment for enhanced signal-to-noise ratio and reduced Mie scattering artifacts
• High-fidelity volumetric sampling via precision plunger pump and electromagnetic flow regulation—ensuring repeatable <±1% volumetric delivery across variable viscosity ranges (0.5–20 cP)
• Configurable particle size channels: standard 0.03–3000 µm range; optional user-defined bins including 1–100 µm, 4–70 µm(c), or 0.1 µm(c) thresholds for critical microcontamination screening
• Modular hardware architecture supporting inline integration into recirculating rinse loops, point-of-use ultrapure water (UPW) distribution lines, or solvent reclaim systems
• Calibration traceability to NIST-traceable PSL standards and compliance with JJG 1061 metrological verification protocol
• Real-time alarm logic with programmable threshold triggers (per size bin or cumulative count), integrated 4–20 mA analog output, and Ethernet-enabled remote supervision

Sample Compatibility & Compliance

The PMT-2 is validated for use with aqueous and non-aqueous liquids having conductivity below 5 µS/cm—including IPA, acetone, DMSO, hydrogen peroxide solutions, ultrapure water (≥18.2 MΩ·cm), and fluorinated solvents. It meets the performance requirements of SJ/T 11480–2014 (for cleanroom wipe testing), FZ/T 64056–2015 (nonwoven fabric particulate shedding), and IEST-RP-CC004.3 (particle counting methodology for cleanroom materials). All firmware and software modules are designed to support audit-ready data integrity per FDA 21 CFR Part 11 requirements, including electronic signatures, time-stamped audit trails, and role-based access control. The instrument’s mechanical design conforms to IP54 ingress protection and operates reliably within Class 100 (ISO 5) cleanroom environments without requiring external laminar flow shielding.

Software & Data Management

The V8.3 Integrated Analysis & Calibration Software separates measurement execution from calibration management—a deliberate architectural choice to eliminate cross-contamination between operational datasets and metrological reference records. The platform supports concurrent multi-user sessions, automated report generation in PDF/CSV/XLSX formats, and dynamic contamination grading per ISO 4406:2017, NAS 1638, and SAE AS4059 Rev E. Data acquisition is fully compatible with iPad-based field deployment via secure Wi-Fi pairing, enabling mobile validation of wipe efficacy during cleanroom qualification audits. All raw scatter pulse data are retained with full metadata (temperature, pressure, flow rate, calibration ID, operator ID), ensuring full traceability during GLP/GMP inspections.

Applications

The PMT-2 serves as a primary tool for quantifying wet-state particle shedding from critical cleanroom consumables—including lint-free wipes, antistatic polyester cloths, foam-tipped swabs, and pre-saturated cleaning pads. It is widely deployed in semiconductor front-end fabs for UPW loop monitoring, photomask cleaning validation, and CMP slurry purity verification. Additional application domains include flat-panel display manufacturing (ITO glass rinsing validation), medical device packaging cleanliness certification (per ISO 11607), pharmaceutical excipient filtration integrity testing, and nanofiltration membrane challenge studies. Its ability to resolve particles down to 30 nm enables early detection of colloidal silica agglomerates, metal oxide residues, and organic precipitates that conventional 0.5 µm counters cannot resolve.

FAQ

What particle size ranges can the PMT-2 detect?
The base configuration covers 0.03–3000 µm; however, sensor modules may be selected for optimized sensitivity in specific bands—such as 0.1 µm(c) for semiconductor UPW or 4–70 µm(c) for wipe material validation per IEST-RP-CC004.3.
Is the PMT-2 suitable for online installation in a UPW distribution system?
Yes—it supports continuous bypass sampling with pressure-rated wetted parts (316L SS + PFA), integrated temperature/pressure compensation, and 4–20 mA output for PLC interfacing.
How is calibration verified and maintained?
Calibration uses NIST-traceable PSL spheres per ISO 21501-4; routine verification follows JJG 1061 procedures, with full audit logs stored in encrypted database format.
Does the software comply with regulatory data integrity requirements?
Yes—V8.3 implements ALCOA+ principles, including attributable, legible, contemporaneous, original, accurate, complete, consistent, enduring, and available records per FDA 21 CFR Part 11 and EU Annex 11.
Can the PMT-2 analyze organic solvents like NMP or PGMEA?
Yes—its optical path and fluidic system are chemically resistant to common lithographic solvents; compatibility confirmation is performed per ASTM D4386 for material selection.