HUANKONG GHK-2051 Dilution Tunnel Particulate Matter (PM) Filter Sampler

Overview

The HUANKONG GHK-2051 Dilution Tunnel Particulate Matter (PM) Filter Sampler is a precision-engineered environmental monitoring instrument designed for quantitative sampling and physical characterization of fine particulate matter (PM_2.5, PM₁₀) emitted from stationary combustion sources—such as coal-fired boilers, industrial kilns, waste incinerators, and catalytic cracking units. It operates on the principle of controlled dilution thermophoresis: hot, humid flue gas is introduced into a stainless-steel dilution tunnel where it is mixed with pre-filtered, temperature-regulated clean air. This process simulates atmospheric cooling and condensation behavior while minimizing volatilization artifacts and particle coagulation. The diluted sample then passes through a residence chamber to ensure thermal and chemical equilibration before being split across multiple parallel sampling paths—each equipped with standardized inertial impactors or cyclonic cut-points per ISO 25500 and EPA Method 202. The system maintains traceable volumetric flow control under standard conditions (STP: 273.15 K, 101.325 kPa), enabling mass-based source apportionment in receptor modeling studies.

Key Features

• Dual-mode sampling operation: selectable constant-dilution-ratio mode or constant-volumetric-flow mode (referenced to standard temperature and pressure, STP)
• Modular multi-path architecture supporting up to five independent particulate sampling channels, each configurable with user-specified flow rates (1–150 L/min per path)
• Integrated capability for concurrent deployment of up to five commercial PM concentration analyzers (e.g., TEOM, β-attenuation, or optical scattering instruments) via standardized pneumatic interfaces
• Heated and insulated sample transport lines (maintained at ≥120 °C) prevent water condensation and semi-volatile organic compound (SVOC) loss
• Real-time monitoring of critical flow parameters: main sample flow, dilution air flow, impactor cut-point flow, bypass flow, and STP-normalized cumulative volume per channel
• Onboard electrochemical O₂ sensor and optional multi-gas module (SO₂, NO_x, CO) compliant with EN 15267-3 for co-emission profiling
• Embedded data logger with non-volatile memory for ≥100 complete sampling event records, including timestamps, flow profiles, temperature/humidity logs, and calibration metadata

Sample Compatibility & Compliance

The GHK-2051 is validated for use with quartz fiber, Teflon-coated glass fiber, and polycarbonate membrane filters (47 mm or 90 mm diameter), compatible with gravimetric analysis (ISO 12141), elemental carbon quantification (NIOSH Method 5040), and ion chromatography (EPA IO-3.2). It fully conforms to GB/T 16157–1996 “Method for Sampling Particulate Matter and Gaseous Pollutants from Stationary Source Exhaust”, and aligns with technical specifications outlined in the *Technical Guidelines for Ambient Particulate Source Apportionment Monitoring* (MEP, 2020). All flow sensors are NIST-traceable and calibrated per ISO/IEC 17025 requirements. Optional audit-ready configuration supports GLP-compliant data integrity protocols—including electronic signature, audit trail, and 21 CFR Part 11–compatible user access control.

Software & Data Management

The embedded firmware provides intuitive touchscreen navigation with multilingual UI (English, Chinese). Raw flow, temperature, humidity, and gas concentration data are timestamped and stored in CSV format. USB 2.0 interface enables direct export to laboratory information management systems (LIMS) or third-party statistical software (e.g., R, Python pandas). Optional PC-based desktop application offers automated report generation—including dilution factor validation, STP correction matrices, and QA/QC flagging per EPA QA/G-5. All data files include embedded metadata headers compliant with ISO 8601 date formatting and SI unit annotation.

Applications

• Source-specific PM emission factor development for regulatory inventories (e.g., China’s MEP Emission Inventory Guidelines)
• Secondary organic aerosol (SOA) precursor volatility assessment during dilution aging experiments
• Validation of real-time PM monitors against reference filter-based measurements
• Co-location studies between stack emissions and ambient receptor sites for positive matrix factorization (PMF) modeling
• Testing of particulate control devices (e.g., ESPs, baghouses, wet scrubbers) under variable load and fuel conditions

FAQ

What is the maximum allowable flue gas temperature at the inlet?
The system accepts flue gas up to 200 °C continuously; optional high-temp probe extension supports 300 °C short-term exposure.
Can the dilution ratio be adjusted in real time during sampling?
Yes—dilution ratio is programmable from 5:1 to 50:1 via PID-controlled mass flow controllers, with closed-loop feedback from differential pressure and thermal anemometry.
Is the GHK-2051 certified for use in EU or US regulatory compliance testing?
While not EPA-certified as a standalone reference method, it meets all functional requirements of EPA Method 202 and EN 13284-1 when operated with certified downstream analyzers and calibrated flow standards.
How is traceability maintained for flow measurements?
Each flow sensor undergoes factory calibration against a primary-standard dry calibrator (NIST-traceable piston prover), with calibration certificates provided and field verification supported via built-in leak-check routines.
Does the system support remote diagnostics or network connectivity?
Standard configuration includes RS-232 and USB; optional Ethernet/Wi-Fi module enables Modbus TCP integration with SCADA platforms and cloud-based telemetry (TLS 1.2 encrypted).