Beijing Hangfeng KLD-BA Portable Particle Counter

Overview

The Beijing Hangfeng KLD-BA Portable Particle Counter is an engineered field-deployable instrument designed for quantitative assessment of solid particulate contamination in liquid media using the light obscuration (LO) principle—also known as the optical blockage or photometric blocking method. In this technique, particles suspended in a fluid stream pass through a focused laser beam; each particle generates a transient reduction in transmitted light intensity proportional to its cross-sectional area. The instrument converts these pulses into particle size channels and cumulative counts per unit volume, enabling direct reporting of contamination levels according to internationally recognized standards including ISO 4406:2017, NAS 1638:2015, and GJB 420B–2006. Its primary application domain encompasses condition monitoring of in-service lubricants and hydraulic fluids across aerospace, power generation, marine propulsion, and industrial machinery sectors—where real-time particle load data directly informs maintenance scheduling, filter performance evaluation, and root-cause analysis of wear mechanisms.

Key Features

• Laser-based light obscuration detection with KLD-TC sensor architecture, optimized for dynamic range and signal-to-noise ratio in viscous and low-conductivity oils
• Dual-mode operation: discrete offline sampling and continuous online monitoring via optional flow cell integration
• Programmable sampling intervals (1–999 minutes), supporting unattended long-term trending of contamination dynamics
• Three embedded calibration reference curves—ACFTD (Air Cleaner Fine Test Dust), ISO Medium Test Dust (MTD), and GOST 17216–2018—enabling traceable conversion between particle count distributions and standardized codes
• Embedded Android operating system with intuitive 7-inch capacitive touchscreen interface, supporting multi-language UI and contextual help overlays
• Precision metering pump system ensuring repeatable sample draw volumes (±1% volumetric accuracy over 5–100 mL range) and stable flow rates (0.5–50 mL/min)
• Integrated thermal printer for immediate hardcopy output of test reports, including date/time stamp, sample ID, standard selected, and full particle count histogram (e.g., >4 µm(c), >6 µm(c), >14 µm(c), >21 µm(c))
• USB 2.0 port for secure data export (CSV/Excel-compatible format), firmware upgrades, and configuration backup—compatible with Windows/Linux host systems

Sample Compatibility & Compliance

The KLD-BA accommodates a broad spectrum of petroleum-based and synthetic fluids, including but not limited to mineral and PAO-based lubricants, phosphate ester and polyol ester fire-resistant hydraulic fluids, naphthenic and paraffinic transformer oils, jet fuel (JP-5, JP-8), and water-glycol hydraulic media. It maintains measurement integrity across kinematic viscosities from 2 to 400 cSt at 40 °C and particle concentrations up to 20,000 particles/mL (>4 µm(c)). All reported contamination grades adhere strictly to the binning logic and rounding rules defined in ISO 4406:2017 Annex A, NAS 1638 Class Code Table, and GJB 420B–2006 Clause 5. Instrument validation protocols align with ASTM D7647–18 (Standard Practice for Calibration and Verification of Automatic Particle Counters) and support GLP-compliant audit trails when used with external laboratory information management systems (LIMS).

Software & Data Management

Data acquisition, processing, and reporting are managed through a dedicated embedded application built on Android 9.0 (Pie). Each measurement record includes immutable metadata: operator ID, instrument serial number, calibration curve identifier, temperature reading (via optional external probe), and GPS-derived location tag (if enabled). Historical datasets are stored in encrypted SQLite databases with automatic rollover after 10,000 entries. Exported CSV files conform to ASTM E2457–22 formatting conventions for interoperability with third-party analytics platforms such as MATLAB, Python Pandas, or commercial CMMS tools. Firmware updates preserve user-configured defaults and maintain backward compatibility with previously generated report templates.

Applications

• Routine in-field verification of hydraulic system cleanliness prior to commissioning or after filter replacement
• On-site troubleshooting of abnormal wear in gearboxes, servo valves, and hydrostatic transmissions
• Acceptance testing of new oil batches against OEM-specified cleanliness targets (e.g., ISO 4406 16/13/10)
• Monitoring degradation of insulating oils in power transformers per IEC 60296 and IEEE C57.106
• Supporting ISO 12103-1 and ISO 4402 traceability during filter efficiency testing (beta-ratio determination)
• Research-grade particle profiling in polymer solution processing and additive manufacturing fluid formulations

FAQ

What particle size ranges does the KLD-BA resolve?
The KLD-BA reports counts across four standardized thresholds: ≥4 µm(c), ≥6 µm(c), ≥14 µm(c), and ≥21 µm(c), consistent with ISO 4406:2017 requirements.
Can the instrument be calibrated using customer-supplied reference standards?
Yes—users may import custom calibration coefficients via USB, provided they are derived from NIST-traceable ACFTD or ISO MTD suspensions tested under ASTM D7647–18 conditions.
Is the thermal printer compatible with continuous label stock?
No—the integrated module accepts only standard 57 mm wide thermal paper rolls with auto-cutter functionality.
Does the device meet FDA 21 CFR Part 11 requirements for electronic records?
While the KLD-BA supports audit-ready timestamps and operator authentication, full Part 11 compliance requires integration with validated LIMS or ELN infrastructure; standalone use falls outside regulated GxP environments.
How often must the KLD-TC sensor be cleaned or serviced?
Optical path cleaning is recommended after every 500 mL of high-contamination samples (>1,000 particles/mL); no scheduled recalibration is required unless physical damage or performance drift is observed.