PULUODY PMT-2GK High-Viscosity Photoresist Liquid Particle Counter

Overview

The PULUODY PMT-2GK High-Viscosity Photoresist Liquid Particle Counter is an engineered solution for quantitative micro- and nano-scale particulate contamination analysis in demanding semiconductor manufacturing and advanced materials processing environments. It operates on the principle of dual-laser narrow-beam light scattering—where two spatially separated laser sources illuminate the sample flow path simultaneously—to enhance signal-to-noise ratio, suppress Mie scattering artifacts, and improve sizing resolution for sub-micron particles suspended in high-viscosity photoresist formulations and other non-aqueous process fluids. Unlike conventional single-beam optical particle counters, the eighth-generation sensor architecture enables robust discrimination of 0.1 µm (c) particles even in optically dense, viscous media such as g-line, i-line, and chemically amplified resists. The instrument is designed for both online integration into cleanroom fluid loops (e.g., resist recirculation lines, developer delivery systems) and offline laboratory use with portable sampling modules.

Key Features

• Dual-laser narrow-beam optical detection system optimized for high-viscosity, low-transmittance photoresist liquids and polymer solutions
• Precision metering piston pump with < ±1% volumetric accuracy and integrated electromagnetic flow stabilization for repeatable sample aspiration
• Customizable detection thresholds: standard 0.1–0.5 µm range; extended options include 1–100 µm or 4–70 µm (c) channels with user-defined counting logic
• Integrated 7-inch color LCD touchscreen interface with optional wireless keyboard/mouse support for flexible lab or cleanroom operation
• Analog 4–20 mA real-time output with programmable alarm thresholds for integration into SCADA, DCS, or MES platforms
• V8.3 proprietary software suite supporting dual-mode operation: independent calibration module (traceable to JJG 1061 and ISO 21501-4) and analytical testing module—eliminating cross-contamination of calibration parameters during routine measurement
• Configurable reporting compliant with ISO 4406:2017 (code-based contamination grading) and NAS 1638 Class ratings

Sample Compatibility & Compliance

The PMT-2GK is validated for use with a broad spectrum of process-critical fluids including photoresists (positive/negative tone, solvent-based and aqueous formulations), developers, strippers, CMP slurries, ultrapure water (UPW), and organic solvents (e.g., PGMEA, ethyl lactate). Its wetted path employs chemically inert materials—quartz flow cell, PTFE/PFA tubing, and sapphire optical windows—to ensure compatibility with aggressive chemistries and prevent leaching or surface adsorption artifacts. The system meets mechanical and electrical safety standards per IEC 61010-1 and is designed to operate within ISO Class 1–5 cleanroom environments. For regulated applications, firmware and software configurations support 21 CFR Part 11 compliance—including electronic signatures, role-based access control, and immutable audit trails—when deployed under documented GLP or GMP quality systems.

Software & Data Management

The V8.3 software platform provides full traceability from raw pulse data to final contamination report. It features separate calibration and analysis workspaces to prevent accidental modification of reference settings during production testing. All calibration events—including PSL sphere verification, background noise profiling, and flow-rate validation—are timestamped, user-logged, and exportable as PDF or CSV. Measurement sessions store full histograms, cumulative distributions, and temporal trend logs. Data export supports ASTM E2457-compliant formats for integration with enterprise LIMS or statistical process control (SPC) tools. Remote diagnostics and firmware updates are supported via secure HTTPS connection, with optional TLS 1.2 encryption for network-deployed units.

Applications

• In-line monitoring of photoresist filtration integrity in semiconductor fab toolsets
• Batch release testing of resist formulations prior to spin-coating
• Contamination tracking across wafer cleaning, etch, and lithography process steps
• Validation of nano-filtration membrane performance in UPW and chemical delivery systems
• Quantitative insoluble particle assessment in polymer precursor solutions used in OLED and display manufacturing
• Root-cause analysis of defect excursions correlated with particle count spikes in real time

FAQ

What viscosity range is the PMT-2GK rated for?
The system is engineered for liquids with dynamic viscosities up to 500 cP at 25°C, including standard and high-solids photoresists. Optional heated flow cells (up to 60°C) extend usability to higher-viscosity formulations.
Can it detect metallic or refractory particles in resist?
Yes—the dual-laser configuration improves sensitivity to high-refractive-index particles (e.g., Al₂O₃, SiO₂, TiN) commonly found in CMP-related contamination, though material identification requires complementary techniques such as SEM-EDS.
Is ISO 21501-4 calibration included with purchase?
A full calibration certificate traceable to NIST-traceable PSL standards and aligned with ISO 21501-4 Annex B is provided upon delivery. Annual recalibration services are available through PULUODY’s accredited metrology partners in Asia and Europe.
Does the system support automated pass/fail decision logic?
Yes—user-defined limit tables can be loaded to trigger visual/audible alarms, relay outputs, or data flagging based on ISO 4406 code thresholds or absolute particle counts per size channel.
How is carryover minimized between high-concentration samples?
The system includes an automated purge-and-rinse sequence using compatible solvents (e.g., IPA, acetone), with programmable rinse volume, dwell time, and flow rate—validated to achieve <0.1% residual carryover per ASTM F3219.