Yuhong TH-810 Beta-Ray Attenuation Low-Concentration Stack Particulate Monitor

Overview

The Yuhong TH-810 Beta-Ray Attenuation Low-Concentration Stack Particulate Monitor is an industrial-grade continuous emission monitoring system (CEMS) instrument engineered for regulatory-compliant measurement of low-level particulate mass concentrations in flue gas streams—specifically targeting emissions below 50 mg/m³. It operates on the beta-ray attenuation principle: a calibrated ⁹⁰Sr radioactive source emits beta particles through a continuously advancing filter tape; particulate-laden gas is drawn onto the tape via controlled isokinetic or constant-flow sampling; attenuation of beta radiation intensity—proportional to deposited mass—is measured by a solid-state detector and converted into real-time PM₁₀ and PM₂.₅ mass concentration (mg/m³) using NIST-traceable calibration curves. Unlike optical scattering or tapered element oscillating microbalance (TEOM) methods, beta-ray attenuation provides direct gravimetric equivalence under high-temperature, high-humidity stack conditions—critical for accurate compliance reporting in thermal power plants, cement kilns, and glass furnaces.

Key Features

• Full-path heated sampling line with adjustable temperature control (up to 180 °C), preventing condensation-induced measurement bias and filter clogging in saturated or acidic flue gases
• Integrated pitot tube and thermocouple within the probe assembly for real-time stack velocity and temperature input—enabling dynamic isokinetic flow correction per ISO 9096 and EPA Method 17
• Dedicated internal industrial air conditioning unit maintains stable thermal environment for optical detector, electronics, and tape transport mechanism—ensuring long-term measurement reproducibility across ambient extremes
• 32-bit embedded microcontroller with deterministic real-time OS manages all sampling sequences, tape advancement, background subtraction, and self-diagnostic routines
• 7-inch high-brightness capacitive touchscreen interface with multilingual GUI (English default), supporting parameter configuration, real-time trend visualization, and event log review without external PC
• Configurable sampling intervals (1–240 minutes), programmable start/stop schedules, and automatic zero/background correction cycles aligned with HJ 76-2017 operational requirements

Sample Compatibility & Compliance

The TH-810 is validated for use with flue gases containing moisture content up to 25% v/v, SO₂ ≤ 5,000 ppm, NOₓ ≤ 1,000 ppm, and operating temperatures up to 200 °C at the probe inlet. Its heated sampling architecture eliminates water interference and ensures representative capture of semi-volatile aerosols. The instrument meets Chinese national standard HJ 653-2013 for PM₂.₅/PM₁₀ CEMS performance specifications—including precision (≤±5% of full scale), zero drift (≤±2% FS/24 h), span drift (≤±2% FS/24 h), and response time (<120 s). While not certified to EU MCERTS or U.S. EPA PS-11, its hardware architecture and data handling protocols support audit-ready documentation for GLP/GMP-aligned environmental QA programs. All stored measurement records include timestamp, flow-corrected concentration, tape position, detector voltage, and diagnostic flags—enabling traceability per ISO/IEC 17025 data integrity requirements.

Software & Data Management

Data acquisition and storage occur onboard using non-volatile flash memory with 32 GB capacity—retaining ≥12 months of 1-minute averaged records at default logging intervals. Raw and processed data are exportable via USB mass storage mode in CSV format, preserving field headers, units, and metadata tags. Remote access is supported via TCP/IP (LAN), GPRS cellular modem (with APN configuration), or serial protocols (RS232/RS485 Modbus RTU). Firmware supports secure firmware updates and remote configuration lockout. Audit trails record all user-initiated actions—including parameter changes, manual calibrations, and maintenance events—with timestamps and operator ID (if enabled). Optional software packages provide automated report generation compliant with provincial environmental monitoring center templates (e.g., Hubei MEP reporting formats).

Applications

• Continuous monitoring of low-concentration particulate emissions from coal-fired, gas-fired, and biomass power plant stacks
• Process-integrated dust monitoring in rotary kilns, clinker coolers, and raw mill exhausts in cement manufacturing
• Emission verification at baghouse and electrostatic precipitator outlets in glass melting furnaces and float glass lines
• Regulatory compliance verification for industrial boilers subject to China’s GB 13223-2011 and local ultra-low emission mandates
• Stack testing support during performance qualification (PQ) and periodic CEMS validation per HJ 75-2017

FAQ

What is the recommended maintenance interval for the beta source and filter tape mechanism?
The ⁹⁰Sr source has a half-life of 28.8 years and requires no routine replacement; however, annual verification of source activity and detector linearity against NIST-traceable standards is advised. Filter tape cartridges are consumables—typical service life is 30 days at 1-hour sampling intervals, depending on dust loading.
Does the TH-810 support dual-range measurement for both low- and high-concentration scenarios?
No—the TH-810 is optimized exclusively for low-concentration operation (0–30 mg/m³). For applications exceeding this range, Yuhong recommends the TH-820 series with extended range (0–200 mg/m³) and auto-range switching.
Can the instrument be integrated into existing SCADA or DCS platforms?
Yes—Modbus RTU over RS485 or TCP/IP Modbus TCP enables seamless integration with industry-standard control systems; register maps and communication protocol documentation are provided upon purchase.
Is the heating system certified for Class I, Division 1 hazardous locations?
No—the TH-810 is rated for general-purpose industrial environments (IP54 enclosure); explosion-proof variants require custom engineering and third-party ATEX/IECEx certification.
How is data integrity ensured during power interruption?
Onboard supercapacitor backup preserves volatile RAM contents for ≥10 minutes; non-volatile memory retains all measurements and configuration settings; “last-known-good” state is restored automatically upon power recovery.