PULUODY PMT-2 Online Ultra-Pure Water Liquid Particle Counter

Overview

The PULUODY PMT-2 Online Ultra-Pure Water Liquid Particle Counter is an industrial-grade, real-time particulate monitoring instrument engineered for continuous, non-invasive measurement of suspended solid contaminants in ultra-pure water (UPW) and other low-conductivity process liquids. It operates on the principle of dual-laser narrow-beam light scattering—where two spatially separated laser sources generate orthogonal detection zones to minimize signal noise, improve sizing resolution, and suppress false counts from refractive index fluctuations or bubble interference. This eighth-generation optical architecture enables stable, high-sensitivity quantification of sub-micron particles down to 0.1 µm(c) under dynamic flow conditions, meeting stringent requirements for semiconductor front-end fabrication, pharmaceutical water-for-injection (WFI) systems, and flat-panel display manufacturing. Unlike offline benchtop counters, the PMT-2 integrates directly into recirculating UPW loops via sanitary tri-clamp or DIN 11851 fittings, supporting uninterrupted 24/7 operation with minimal maintenance.

Key Features

• Dual-laser narrow-beam optical sensor with independent wavelength alignment and background noise suppression circuitry
• Precision plunger pump coupled with electromagnetic flow regulation for volumetric accuracy better than ±1% across 1–500 mL/min range
• Configurable detection thresholds: standard 0.1–1.0 µm; extended modes support user-defined channels (e.g., 4–70 µm(c) for filter integrity verification or 1–100 µm for post-polishing slurry analysis)
• Embedded color LCD touchscreen interface with intuitive navigation; supports optional wireless keyboard/mouse for remote configuration
• Analog 4–20 mA output with programmable alarm triggers for integration into DCS/SCADA systems
• V8.3 Particle Analysis Software Suite featuring separate calibration and analysis environments to eliminate software-induced bias during regulatory audits
• Compliance-ready data structure including electronic signatures, time-stamped audit trails, and export formats compatible with LIMS (ASTM E2500, ISO/IEC 17025)

Sample Compatibility & Compliance

The PMT-2 is validated for use with ultra-pure water (resistivity ≥18.2 MΩ·cm), deionized water, hydrogen peroxide solutions, SC1/SC2 cleaning baths, photoresist developers, and low-viscosity organic solvents used in microelectronics processing. It complies with pharmacopeial standards including United States Pharmacopeia , European Pharmacopoeia 2.9.19, Japanese Pharmacopoeia JP 6.07, and Chinese Pharmacopoeia 2020 Edition Volume IV. For medical device applications, it satisfies GB 8368–2018 (sterile infusion equipment) and ISO 8536-4. Calibration traceability follows JJG 1061–2010 (China National Metrology Verification Regulation) or ISO 21501-4 using NIST-traceable polystyrene latex (PSL) reference materials. Instrument qualification includes IQ/OQ documentation templates aligned with FDA Process Validation Guidance and Annex 15 of EU GMP.

Software & Data Management

The V8.3 software platform provides dual-mode operation: a locked-down “Calibration Mode” restricted to authorized metrology personnel and a fully functional “Analysis Mode” for routine operators. All calibration events—including flow rate verification, size bin validation, and background noise profiling—are digitally signed and archived with immutable timestamps. Reports generate compliant outputs in PDF/A-1b format, listing particle counts per milliliter, ISO 4406:2017 cleanliness codes, and cumulative/differential histograms. Data export supports CSV, XML, and direct SQL database push. Optional 21 CFR Part 11 compliance package includes role-based access control, electronic signature workflows, and automated backup to network-attached storage (NAS) with SHA-256 hash verification.

Applications

The PMT-2 serves as a critical control point in multiple regulated and high-precision industries. In semiconductor fabs, it monitors UPW distribution loops upstream of photolithography tools and chemical mechanical planarization (CMP) stations. In biopharmaceutical facilities, it verifies WFI quality at point-of-use and detects shedding from stainless-steel piping or membrane filters. For flat-panel display production, it validates cleaning bath purity prior to ITO sputtering and TFT array coating. Additional use cases include validation of nano-filtration membranes (NF), integrity testing of 0.1 µm absolute-rated cartridges, and trending of particulate generation during wafer scrubbing cycles. Its modular design allows field retrofitting for new fluid chemistries without hardware replacement.

FAQ

Does the PMT-2 require periodic recalibration?
Yes—calibration intervals are defined by risk assessment per ISO/IEC 17025; typical frequency is every 6 months for GMP environments, with intermediate verification using clean-water blanks performed daily.
Can the instrument detect air bubbles or dissolved gases?
No—the optical system discriminates against transient gaseous inclusions via dual-laser coincidence logic and dwell-time filtering; only solid-phase particles with refractive index contrast >1.05 relative to the medium are reported.
Is remote firmware update supported?
Yes—secure OTA updates are available via encrypted HTTPS connection with digital certificate authentication; update logs are appended to the audit trail.
What sample volume is required for statistically valid results?
Minimum recommended volume is 10 mL per test cycle; for trend analysis in UPW loops, continuous sampling at 50 mL/min over 1–5 minute windows yields robust 95% confidence intervals per ISO 21501-4 Annex B.
How does the PMT-2 handle high-particle-concentration samples?
It applies real-time coincidence correction up to 1000 particles/mL (2.5% error margin); beyond this, dilution protocols integrated into V8.3 guide operators through automated serial dilution sequences using external peristaltic pumps.