PULUODY PMT-2L Copper Sulfate Liquid Particle Counter

Overview

The PULUODY PMT-2L Copper Sulfate Liquid Particle Counter is a high-precision optical particle counter engineered for quantitative measurement of insoluble particulate contamination in low-conductivity, non-aqueous, and ionic liquid media—including copper sulfate solutions widely used in electroplating, semiconductor wet processing, and printed circuit board (PCB) manufacturing. Unlike conventional single-wavelength counters, the PMT-2L integrates an eighth-generation dual-laser narrow-beam sensor architecture, enabling simultaneous detection across two orthogonal scattering angles to improve sizing resolution and reduce Mie scattering bias in high-refractive-index liquids. Its design addresses critical challenges in microcontamination monitoring where traditional Coulter counters fail due to electrolyte interference and optical obscuration. The instrument operates on the principle of light extinction and forward-angle laser scattering, calibrated per ISO 21501-4 and validated against NIST-traceable polystyrene latex (PSL) standards. It is not a general-purpose water quality analyzer but a purpose-built tool for controlled industrial process fluids where particle-induced defects—such as wafer scratches, plating voids, or filter clogging—directly impact yield and reliability.

Key Features

• Dual-laser narrow-beam optical detection system with independent wavelength channels (650 nm & 780 nm) optimized for copper sulfate and other conductive electrolyte solutions
• Precision piston pump sampling with electromagnetic flow control ensures volumetric accuracy better than ±1% and repeatability under dynamic process conditions
• Configurable detection thresholds: user-defined size bins from 1–100 µm or 4–70 µm(c); extended range option supports 0.03–3000 µm with certified calibration spheres
• Integrated analog 4–20 mA output with programmable alarm logic for real-time integration into SCADA, DCS, or PLC-based process control systems
• Touchscreen HMI with embedded V8.3 analysis software—separating measurement acquisition from calibration management to prevent data corruption during metrological verification
• Compliance-ready audit trail: timestamped event logging, operator ID tagging, and electronic signature support aligned with FDA 21 CFR Part 11 requirements for regulated environments

Sample Compatibility & Compliance

The PMT-2L is validated for use with aggressive, high-ionic-strength process fluids including copper sulfate electrolytes (up to 250 g/L CuSO₄·5H₂O), acidic cleaning agents (pH 0.5–2.0), alkaline strippers, and polymer-containing rinse solutions. Its fluidic path employs chemically inert sapphire nozzles and PFA tubing rated for continuous exposure to oxidizing and chelating chemistries. Regulatory alignment includes full traceability to pharmacopeial standards: USP for injectables, EP 2.9.19 for parenteral preparations, ChP 2020 General Chapter 0903, and GB 8368 for medical infusion devices. Calibration follows JJG 1061–2010 (Chinese national metrological verification regulation) using ISO 21501-4 compliant reference materials. All firmware and software versions are documented and version-controlled to support GLP/GMP validation protocols.

Software & Data Management

The V8.3 software suite provides dual-mode operation: standalone PC-based analysis for offline forensic review and embedded touchscreen interface for real-time process monitoring. Data export supports CSV, PDF, and XML formats compatible with LIMS integration. Each measurement record includes raw pulse histograms, size distribution curves, cumulative counts, and ISO 4406 or NAS 1638 contamination codes. Calibration history, sensor diagnostics, and maintenance logs are stored with cryptographic hashing to ensure data integrity. Remote firmware updates are signed and verified; no cloud dependency is required for operation, preserving network security in classified or air-gapped production facilities.

Applications

The PMT-2L serves as a critical quality gate in semiconductor front-end manufacturing—monitoring copper sulfate plating baths for >2 µm agglomerates that cause via-fill failures. It is deployed inline upstream of 10 nm filtration in flat-panel display (FPD) TFT array fabrication, verifying removal efficiency of photoresist residues. In pharmaceutical excipient purification, it quantifies sub-10 µm insolubles in copper-catalyzed reaction solvents. Additional use cases include: real-time tracking of particle generation during ultrasonic cleaning of silicon wafers; validation of nano-filtration membrane integrity in copper recovery loops; and trending of abrasive wear debris in electrochemical mechanical polishing (ECMP) slurries. Its mobility enables both fixed-mount continuous surveillance and portable batch verification across cleanroom zones.

FAQ

Can the PMT-2L measure particles in undiluted copper sulfate solution without dilution or filtration?

Yes—the optical design and flow cell geometry accommodate direct analysis of saturated CuSO₄ solutions (up to 25 °C, ~200 g/L) without signal saturation or nozzle clogging.
Does the instrument meet FDA 21 CFR Part 11 requirements for electronic records?

Yes—audit trail functionality, role-based access control, and electronic signature capability are enabled and configurable per validation protocol.
What calibration standards are supported for routine verification?

NIST-traceable PSL spheres (ISO 21501-4), certified glass microspheres, and custom-certified copper oxide suspensions per customer-specific SOPs.
Is the PMT-2L suitable for GMP-regulated pharmaceutical water systems?

No—it is not designed for purified water (PW) or water-for-injection (WFI) per USP ; its application scope is limited to conductive process electrolytes and organic solvents.
How is sensor drift compensated during long-term unattended operation?

Automatic zero-check cycles every 30 minutes using blank-solvent flush, combined with real-time photodiode gain stabilization and thermal compensation algorithms.