PULUODY PMT-20 Coal Powder Liquid Particle Counter

Overview

The PULUODY PMT-20 Coal Powder Liquid Particle Counter is a high-precision optical particle counter engineered for quantitative analysis of suspended particulate contamination in liquid media—specifically optimized for coal-derived slurries, cleaning agents, ultrapure water, semiconductor process chemicals, and polymer solutions. It operates on the principle of dual-laser narrow-beam light scattering, utilizing two spatially separated laser sources with collimated illumination to minimize Mie scattering interference and enhance resolution across the sub-100 nm to 3 mm range. Unlike conventional single-wavelength systems, this eighth-generation sensor architecture enables simultaneous detection of both refractive-index-sensitive and size-discriminative scattering signatures—critical for distinguishing carbonaceous coal fines from mineral ash or organic agglomerates in complex slurry matrices. The instrument supports both online continuous monitoring and offline batch analysis, fulfilling critical requirements for quality control in coal beneficiation, power generation feedstock preparation, and industrial fluid cleanliness certification.

Key Features

• Dual-laser narrow-beam optical detection system with independent wavelength alignment and real-time beam stabilization, enabling robust discrimination of particles as small as 0.03 µm in opaque or turbid coal suspensions.
• Precision volumetric sampling via calibrated piston pump and ultra-stable electromagnetic flow control, achieving <±1% volumetric accuracy and repeatable aspiration under variable viscosity conditions (up to 50 cP).
• Modular design supporting oil/water dual-phase compatibility—validated for use with aqueous coal wash water, diesel-based coal transport fluids, and solvent-based cleaning formulations without sensor fouling or calibration drift.
• Embedded 7-inch color LCD touchscreen interface with optional wireless keyboard/mouse support; fully functional offline operation with onboard data logging (≥10,000 sample records).
• Configurable detection channels: user-definable size bins including standard 1–100 µm(c), 4–70 µm(c), or custom 0.1 µm(c) thresholds—aligned with ISO 4406, NAS 1638, and ASTM D7619 reporting conventions.
• Integrated analog output (4–20 mA) with programmable alarm thresholds for integration into SCADA or DCS environments; alarm triggers support multi-level severity classification (warning, alert, shutdown).

Sample Compatibility & Compliance

The PMT-20 is validated for use with coal-water slurries (CWS), hydrocarbon-based coal carriers, deionized water, alkaline cleaning solutions, and polymer-modified suspensions. Its wetted path employs chemically inert sapphire flow cells and PTFE-sealed valves, ensuring compatibility with pH 2–12 media and resistance to abrasive coal particulates. Regulatory compliance includes full alignment with pharmacopeial standards (USP , EP 2.9.19, ChP 2020 Appendix IX R), ISO 21501-4 for light-scattering instrumentation, and GB/T 18854 for liquid particle counters. For GMP/GLP environments, audit-trail functionality is enabled through time-stamped calibration logs, operator ID tagging, and electronic signature support—fully compatible with FDA 21 CFR Part 11 requirements when deployed with validated networked software configurations.

Software & Data Management

The V8.3 Particle Analysis Software Suite provides dual-mode operation: standalone embedded firmware for field deployment and PC-hosted analytical workstation for laboratory-grade reporting. Crucially, measurement acquisition and calibration verification are functionally isolated—eliminating cross-contamination between routine testing and metrological traceability workflows. Data export supports CSV, PDF, and XML formats with embedded metadata (sample ID, operator, timestamp, environmental conditions). Statistical modules include cumulative/differential distribution plots, ISO 4406 code assignment, trend analysis over time-series batches, and comparative overlay of multiple sample runs. All software binaries are digitally signed and version-controlled per IEC 62304 Class B medical device software guidelines.

Applications

Primary application domains include coal preparation plant effluent monitoring, thermal power station feedwater purity assurance, coal-to-liquids (CTL) process fluid qualification, and environmental release compliance for coal handling facilities. In manufacturing contexts, the PMT-20 serves as a reference-grade tool for validating filter integrity in coal slurry filtration systems, assessing dispersion stability in nanocoal additives, and verifying cleanliness of reclaimed process water used in coal pelletization. Additional use cases span semiconductor wafer rinse validation, pharmaceutical excipient suspension characterization, and microfiltration membrane performance benchmarking—leveraging its extended low-end sensitivity down to 30 nm for colloidal carbon detection.

FAQ

Does the PMT-20 require annual recalibration by an accredited lab?
Yes—per ISO/IEC 17025 recommendations, baseline calibration using NIST-traceable polystyrene latex (PSL) standards or ISO 21501-4-compliant reference materials should be performed annually; field verification with secondary standards is recommended before each critical measurement campaign.
Can the instrument differentiate coal particles from silica or clay contaminants?
While size distribution alone cannot identify composition, the dual-laser ratio signature combined with refractive index modeling (via optional software module) allows empirical classification of high-carbon vs. mineral-dominated populations within overlapping size bands.
Is the flow cell resistant to erosion from abrasive coal slurry?
The sapphire capillary flow cell exhibits Mohs hardness ≥9 and has been tested for >5,000 hours of continuous operation with 30 wt% coal slurry at 1.5 m/s velocity without measurable wear-induced signal drift.
What cybersecurity provisions exist for network-connected units?
Firmware v8.3+ supports TLS 1.2 encrypted data transmission, role-based access control (RBAC), and disabled default credentials—meeting IEC 62443-3-3 SL2 requirements for industrial control systems.
How is compliance with Chinese national standards verified?
Type evaluation reports issued by CNAS-accredited institutes (e.g., China Institute of Metrology) confirm conformance with JJG 1061–2010 and GB/T 18854–2015, including linearity, limit of detection, and counting efficiency validation protocols.