PULUODY PMT-2 Optical Liquid Particle Counter with Integrated Cleaning Agent Compatibility

Overview

The PULUODY PMT-2 Optical Liquid Particle Counter is an advanced, dual-laser narrow-beam light scattering instrument engineered for high-sensitivity particulate contamination monitoring in ultra-clean liquid process streams. Designed specifically for critical applications in semiconductor manufacturing, pharmaceutical water systems, microelectronics cleaning validation, and nanofiltration process control, the PMT-2 employs a proprietary eighth-generation dual-wavelength laser detection architecture that enables reliable quantification of sub-micron particles from 0.1 µm upward. Its optical design minimizes Mie scattering artifacts and optimizes signal-to-noise ratio across low-conductivity media—including deionized water, photoresist solvents, aqueous cleaning agents, and polymer solutions—without requiring refractive index compensation. Unlike conventional single-beam counters, the PMT-2’s coaxial dual-laser geometry provides orthogonal verification of particle transit events, significantly reducing false positives from air bubbles, dissolved gas nucleation, or optical noise. The system operates on the principle of single-particle optical sensing (SPOS), where each particle passing through the precisely defined sensing zone interrupts the laser path, generating a pulse proportional to its effective cross-sectional area.

Key Features

• Eighth-generation dual-laser narrow-beam sensor with real-time coincidence correction algorithm (validated up to 1000 particles/mL at ≤2.5% error)
• Integrated precision metering piston pump and electromagnetic flow control system ensuring volumetric accuracy better than ±1% across variable viscosity ranges (0.8–5 cP)
• Dual-mode operation: fully autonomous online monitoring (with 4–20 mA analog output and programmable alarm thresholds) and portable offline analysis (battery-supported sampling with traceable syringe-based injection)
• V8.3 firmware suite featuring separation of calibration routines and routine testing workflows—eliminating operator-induced drift during GxP-compliant validation cycles
• Modular optical path design supporting field-swappable fluidic cells for aggressive chemistries (e.g., SC1/SC2 cleans, HF blends, peroxide-based etchants) without sensor degradation
• Touchscreen HMI with multilingual UI (English, Simplified Chinese, Korean) and optional wireless keyboard/mouse support for lab-integrated data entry

Sample Compatibility & Compliance

The PMT-2 is validated for use with a broad spectrum of low-turbidity, low-absorbance liquids including ultrapure water (UPW), semiconductor-grade cleaning agents (e.g., ammonium hydroxide/hydrogen peroxide mixtures), photoresist developers, spin-on glass precursors, and polymer solutions used in OLED and display fabrication. It meets the physical detection requirements of ISO 21501-4 for liquid-borne particle counters and supports full traceability to national metrology institutes via JJG 1061–2010 (China) and ISO/IEC 17025-accredited calibration using NIST-traceable polystyrene latex standards. For regulated pharmaceutical environments, the system satisfies USP , Ph. Eur. 2.9.19, and ChP 2020 General Chapter 0903 for sub-visible particle enumeration in injectables and purified water. Optional 21 CFR Part 11 compliance packages include role-based access control, electronic audit trails, and digital signature logging—all independently verifiable during FDA or EMA inspections.

Software & Data Management

The embedded V8.3 software platform delivers dual-track functionality: a calibration mode (requiring administrator privileges and cryptographic timestamping) and a routine measurement mode (locked to predefined SOPs). All raw pulse data, histogram bins, and cumulative counts are stored in encrypted SQLite databases with SHA-256 hashing. Export formats include CSV (ASTM E2457-compliant), PDF analytical reports with embedded metadata (operator ID, instrument serial, calibration certificate ID, environmental temperature/humidity), and XML for LIMS integration. iPad-based remote acquisition leverages TLS 1.2–secured Wi-Fi streaming, enabling real-time dashboard visualization across cleanroom zones without compromising network segmentation policies. Audit logs record every parameter change, report generation, and calibration event—including IP address, session duration, and biometric or token-based login confirmation.

Applications

The PMT-2 serves as a primary contamination control tool in semiconductor front-end fabs for monitoring rinse tank effluent, CMP slurry purity, and photomask cleaning bath integrity. In pharmaceutical manufacturing, it validates WFI and PW distribution loops per Annex 1 and supports filter integrity trending through sequential upstream/downstream particle profiling. Additional deployment contexts include: qualification of nano-ceramic membrane filtrates in battery electrolyte production; tracking abrasive particle carryover in silicon wafer polishing slurries; assessing microplastic shedding from medical-grade tubing in dialysis equipment; and verifying cleanliness of display panel edge-sealing adhesives prior to lamination. Its modular inlet design permits direct integration into recirculating UPW loops via sanitary tri-clamp fittings or standalone batch analysis using ISO-standard sample bottles.

FAQ

What particle size ranges can the PMT-2 resolve with certified accuracy?
The base configuration is validated for 0.1–0.5 µm detection per ISO 21501-4 Annex B; extended ranges (1–100 µm or 4–70 µm(c)) require factory-installed optical filters and NIST-traceable recalibration.
Does the system support automated pass/fail reporting against ISO 4406 or NAS 1638 standards?
Yes—V8.3 includes built-in classification engines for both standards, with configurable reporting intervals and auto-generation of contamination grade certificates.
Can the PMT-2 operate continuously in Class 100 cleanroom environments?
It meets IEC 60529 IP54 ingress protection and has been deployed in ISO 14644-1 Class 5 zones with external HEPA-filtered air cooling; optional purge kits available for Class 3 operation.
Is third-party software integration possible via OPC UA or Modbus TCP?
Standard Ethernet port supports Modbus TCP for PLC interfacing; OPC UA gateway modules are available as OEM add-ons with pre-certified drivers for Siemens PCS7 and Rockwell FactoryTalk.
How often must the optical sensor be recalibrated under GMP conditions?
Annual calibration is recommended; however, the system supports intermediate verification using onboard reference beads (traceable to SRM 1963) every 72 operational hours per EU GMP Annex 11 §5.12.