PULUODY PMT-2-U Ultra-Pure Water Particle Counter

Overview

The PULUODY PMT-2-U Ultra-Pure Water Particle Counter is an advanced optical particle counting system engineered specifically for the stringent requirements of semiconductor manufacturing, pharmaceutical water systems, and microelectronics cleaning validation. It operates on the principle of dual-laser narrow-beam light scattering—where two spatially separated, collimated laser sources illuminate a precisely defined flow path—to enable high-sensitivity detection of sub-micron particulates in ultra-pure water (UPW) and low-conductivity process fluids. Unlike conventional single-beam instruments, this 8th-generation sensor architecture minimizes Mie scattering interference and improves signal-to-noise ratio for particles as small as 0.05 µm, making it suitable for monitoring UPW resistivity >18.2 MΩ·cm and TOC <1 ppb environments. Its modular design supports both online integration into recirculation loops and offline portable analysis, fulfilling critical needs across cleanroom qualification, filter integrity verification, and post-rinse validation.

Key Features

• Dual-laser narrow-beam optical detection with independent wavelength alignment for enhanced resolution in the 0.05–0.5 µm range
• High-fidelity volumetric sampling via precision plunger pump and electromagnetic flow regulation (<±1% accuracy)
• Real-time analog output (4–20 mA) with programmable alarm thresholds for automated process intervention
• Multi-channel sizing capability: factory-configured 0.05–0.2 µm and 0.1–0.5 µm channels, plus customizable bins from 1–100 µm or 4–70 µm(c)
• Touchscreen HMI with wireless keyboard/mouse support and embedded V8.3 firmware for on-device calibration and reporting
• ISO 21501-4 and JJG 1061 compliant calibration traceability using NIST-traceable polystyrene latex standards
• Robust architecture rated for Class 100 (ISO 5) cleanroom deployment and continuous 24/7 operation

Sample Compatibility & Compliance

The PMT-2-U is validated for use with ultrapure water (UPW), deionized water, photoresist solvents, CMP slurries, etchants, and low-viscosity organic solvents (e.g., IPA, acetone). It accommodates conductivity ranges from 0.055–18.2 µS/cm without dilution or conditioning. All wetted materials—including fluidic path, sample cell, and inlet tubing—are constructed from electropolished 316L stainless steel and fluoropolymer (PFA/PTFE) to prevent leaching or adsorption artifacts. The instrument meets mechanical and electrical safety requirements per IEC 61010-1 and EMC compliance per IEC 61326-1. For regulated environments, optional V8.3 software modules provide full 21 CFR Part 11 compliance—including electronic signatures, audit trails, and role-based access control—enabling use in FDA-inspected pharmaceutical water systems and ISO 13485 medical device manufacturing.

Software & Data Management

PULUODY V8.3 is a dual-mode analytical platform supporting both PC-based laboratory management and iPad-enabled field operation. The software implements strict separation between measurement acquisition and calibration data storage—a design feature that eliminates cross-contamination of reference values during routine testing. Raw pulse-height histograms are preserved with timestamped metadata, enabling retrospective re-analysis without data loss. Reporting complies with ISO 4406:2017 and NAS 1638 standards, with automatic generation of contamination codes, particle concentration tables (particles/mL), and trend charts. Data export supports CSV, PDF, and XML formats compatible with LIMS integration. Optional cloud synchronization enables centralized fleet monitoring across multiple fab tools or QC labs.

Applications

• Semiconductor front-end process: UPW loop monitoring at point-of-use (POU), DI water polishing validation, and post-wafer rinse cleanliness assessment
• Pharmaceutical water systems: PW/WFI distribution loop surveillance per USP , including microbial particle correlation studies
• Flat-panel display manufacturing: particle load tracking in photoresist developers and etch rinse tanks
• Advanced packaging: contamination mapping in underfill and molding compound dispense lines
• Nanofiltration and ultrafiltration validation: challenge testing with monodisperse latex standards per ASTM F312-22
• Research applications: colloidal stability studies in polymer solutions and nanoparticle suspensions

FAQ

What calibration standards are supported?
The PMT-2-U accepts NIST-traceable polystyrene latex spheres (PSL), ISO 21501-4 reference materials, and national metrology institute-certified standards per JJG 1061. Calibration verification is performed using certified 0.1 µm and 0.5 µm PSL suspensions.
Can the instrument be integrated into a SCADA or MES system?
Yes—via its isolated 4–20 mA analog output and Modbus TCP option (available upon request), the PMT-2-U supports direct integration into industrial automation platforms for real-time particle event logging and alarm escalation.
Is the sensor susceptible to air bubble interference?
The optical chamber incorporates hydrophobic surface treatment and laminar flow optimization to minimize bubble adhesion; additionally, built-in acoustic degassing detection triggers automatic hold-and-flush protocols when entrained gas is identified.
How is data integrity ensured during long-term unattended operation?
All measurements include CRC-32 checksums, internal SD card write-cycling protection, and battery-backed real-time clock synchronization. Optional V8.3 audit trail module logs user actions, parameter changes, and calibration events with immutable timestamps.
Does the system meet semiconductor industry water purity specifications?
Yes—the PMT-2-U is routinely deployed in fabs adhering to SEMI F63 (UPW particle specifications) and SEMI F57 (monitoring methodology), with documented performance down to 0.05 µm in 18.2 MΩ·cm water at flow rates of 20–50 mL/min.