PULUODY PMT-2 Dual-Laser Narrow-Beam Optical Particle Counter for Liquid Micro/Nano Contamination Analysis

Overview

The PULUODY PMT-2 Dual-Laser Narrow-Beam Optical Particle Counter is a high-fidelity liquid contamination monitoring instrument engineered for micro- and nanoscale particle quantification in ultra-clean process fluids. It operates on the principle of dual-wavelength laser light scattering within a precisely collimated optical path—enabling simultaneous detection and sizing of insoluble particulates across an exceptionally broad dynamic range (0.03 µm to 3000 µm). Unlike conventional single-laser systems, the eighth-generation dual-laser architecture minimizes Mie scattering ambiguity and enhances resolution at sub-micron thresholds—critical for semiconductor rinse validation, pharmaceutical water system qualification, and nanofiltration integrity testing. The instrument supports both online (in-line or side-stream) and offline (batch sampling) configurations, delivering real-time, continuous particle concentration data (particles/mL) and ISO 4406 or NAS 1638 contamination grading per sample volume.

Key Features

• Dual-laser narrow-beam optical sensor with independent wavelength channels for improved refractive index discrimination and reduced signal noise floor
• Integrated precision metering system combining a stainless-steel ceramic piston pump and closed-loop electromagnetic flow control—ensuring volumetric repeatability better than ±1%
• Modular sensor configuration: selectable detection thresholds including 0.1 µm(c), 1–100 µm, or 4–70 µm(c) modes to align with pharmacopeial or industrial cleanliness specifications
• V8.3 software platform featuring physically separated calibration and analysis modules—eliminating software-induced bias during traceability verification
• Real-time analog output (4–20 mA) with programmable alarm thresholds for integration into SCADA, DCS, or PLC-based manufacturing execution systems
• Compliance-ready architecture supporting dual-standard operation: civil-grade (e.g., ChP, USP, EP) and defense-grade (e.g., MIL-STD-1246C, GJB 420B) contamination classification protocols

Sample Compatibility & Compliance

The PMT-2 is validated for use with low-conductivity and non-aqueous liquids including ultrapure water (UPW), semiconductor cleaning solvents (e.g., SC1, SC2, DI ethanol), photoresist developers, polymer solutions, and medical-grade glycols. Its fluidic pathway employs chemically inert wetted materials (316L SS, sapphire, fused silica) compatible with aggressive chemistries and low-particulate rinse protocols. Regulatory alignment includes full traceability to ISO 21501-4 (calibration of light-scattering particle counters), USP and (subvisible and visible particle testing), European Pharmacopoeia 2.9.19, Chinese Pharmacopoeia 2020 Edition, and national metrological verification regulation JJG 1061. Optional NIST-traceable latex sphere calibration and ISO 17025-accredited verification services are available through PULUODY’s certified metrology partners.

Software & Data Management

The V8.3 software suite provides audit-trail-enabled operation compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, user role-based access control, and immutable raw data logging. All calibration parameters, sample metadata, and measurement sequences are stored in encrypted SQLite databases with timestamped revision history. Reporting outputs include ISO 4406 contamination codes, particle size distribution histograms (log-normal or Rosin-Rammler fitting), cumulative counts per channel, and trend charts with statistical process control (SPC) overlays. iPad-native wireless acquisition allows remote sampling initiation, live waveform viewing, and report export via secure Wi-Fi—without compromising data integrity or network isolation requirements in GMP environments.

Applications

• Real-time UPW loop monitoring in semiconductor front-end fabs (per SEMI F63)
• In-process validation of final rinse steps for silicon wafers, flat-panel display substrates, and MEMS components
• Quality release testing of injectables, ophthalmic solutions, and biologics per USP
• Integrity assessment of nanofiltration membranes used in API purification and cell culture media preparation
• Contamination diagnostics in hydraulic fluid conditioning systems and aerospace lubricant reclamation lines
• Research-grade particulate stability profiling of colloidal dispersions, liposomal formulations, and nanoparticle suspensions

FAQ

What regulatory standards does the PMT-2 meet for pharmaceutical applications?

The instrument complies with USP , EP 2.9.19, ChP 2020, and ISO 21501-4; calibration and verification procedures follow JJG 1061 and can be extended to ISO/IEC 17025 accreditation.
Can the PMT-2 be integrated into an existing cleanroom monitoring network?

Yes—it supports Modbus TCP, OPC UA, and 4–20 mA analog interfaces for seamless integration with BMS, MES, or centralized particle surveillance platforms.
Is sensor recalibration required between different liquid matrices?

No; the dual-laser optical design compensates for refractive index variance across aqueous and organic solvents without hardware reconfiguration.
How is data integrity ensured during long-term unattended operation?

V8.3 enforces automatic checksum validation, cyclic redundancy checks on all acquired waveforms, and write-once archival storage with SHA-256 hashing for each measurement session.
Does the system support GLP/GMP-compliant audit trails?

Yes—full electronic record retention includes operator ID, timestamped parameter changes, calibration event logs, and digital signature capture aligned with Annex 11 and ALCOA+ principles.