Tianhong TH-2000PM Outdoor Atmospheric Particulate Matter Monitor
| Brand | Tianhong |
|---|---|
| Origin | Hubei, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | TH-2000PM |
| Measurement Principle | Beta-ray Absorption (β-ray) with Dynamic Heating System (DHS) |
| Measured Parameters | PM₁₀ and PM₂.₅ |
| Compliance | Designed to meet Chinese Environmental Monitoring Standards (HJ 653–2013, HJ 93–2013) |
| Data Output | RS-232/RS-485, Analog 4–20 mA, Digital I/O |
| Display | 7-inch TFT color touchscreen (Chinese UI) |
| Data Storage | Internal flash memory supporting ≥1 year of 1-min interval data |
| Communication | Integrated GPRS module for remote telemetry |
| Environmental Rating | IP55 enclosure |
| Operating Temperature | −30 °C to +50 °C |
| Power Supply | AC 220 V ±10%, 50 Hz or optional DC 12 V backup |
Overview
The Tianhong TH-2000PM Outdoor Atmospheric Particulate Matter Monitor is an EPA-equivalent reference-grade ambient air monitoring instrument engineered for continuous, unattended measurement of mass concentrations of inhalable (PM₁₀) and fine (PM₂.₅) particulate matter. It operates on the beta-ray absorption principle—where a calibrated β-ray source (typically 14C or 85Kr) emits electrons through a continuously advancing filter tape; attenuation of the beam correlates linearly with deposited particle mass, enabling quantitative gravimetric determination without reliance on optical assumptions or calibration drift. The integrated Dynamic Heating System (DHS) actively controls sample air dew point prior to filtration, minimizing volatilization losses of semi-volatile compounds (e.g., ammonium nitrate, organic aerosols), thereby improving measurement accuracy and comparability with federal reference methods (FRM). Designed for permanent outdoor deployment, the TH-2000PM meets structural and environmental robustness requirements for rooftop, roadside, tunnel, industrial fence-line, and emergency response monitoring sites—requiring no external shelter, climate-controlled enclosure, or auxiliary power conditioning under standard operating conditions.
Key Features
- True co-located sampling and detection architecture: Filter tape advances incrementally while β-ray attenuation is measured in real time at the same physical location—eliminating transport artifacts and ensuring temporal fidelity.
- IP55-rated weatherproof enclosure with internal thermoelectric temperature control system, maintaining stable internal thermal environment across −30 °C to +50 °C ambient range.
- Onboard 7-inch resistive touchscreen display with intuitive Chinese-language menu navigation—supporting local configuration, real-time trend visualization, and diagnostic status review without external PC.
- Integrated GPRS modem with configurable APN and TLS-secured data transmission protocol for remote firmware updates, parameter reconfiguration, and alarm-triggered event reporting.
- Dual-channel analog output (4–20 mA) and digital interfaces (RS-232/RS-485 Modbus RTU) compliant with SCADA and central data acquisition systems (CDAS).
- Digital input port enables synchronized triggering from external sensors (e.g., rain gauge, door switch) or integration into multi-parameter environmental stations.
- Expandable meteorological interface: Standard M12 connector supports plug-and-play connection to certified wind speed/wind direction transducers (e.g., ultrasonic or cup/vane types), allowing concurrent recording of micro-meteorological context.
Sample Compatibility & Compliance
The TH-2000PM is validated for ambient air matrices meeting ISO 12103-1 A2 Fine Test Dust and ISO 12103-1 A4 Coarse Test Dust traceability benchmarks. Its DHS-modulated sampling train complies with the operational equivalency criteria defined in HJ 653–2013 (Technical Specification for Ambient Air Quality Continuous Monitoring Systems) and HJ 93–2013 (Technical Requirements for PM₁₀ and PM₂.₅ Samplers). While not certified as a US EPA FRM or EU EN 12341 reference method device, its measurement methodology aligns with the physical principles underlying those standards. The instrument’s data structure and metadata tagging support audit-ready logging per GLP-aligned quality assurance protocols—including timestamped filter change logs, flow calibration records, and heater temperature traceability.
Software & Data Management
Local data storage utilizes industrial-grade NAND flash memory capable of retaining ≥525,600 records (one-minute resolution over 12 months) with cyclic overwrite protection. All stored records include embedded checksums and hardware-monitored timestamps synchronized via NTP or GPRS network time. Remote data retrieval is supported through Tianhong’s proprietary TCloud™ platform (accessible via HTTPS web interface or RESTful API), which provides role-based access control, automated report generation (PDF/CSV), and configurable alert thresholds (SMS/email/GPRS push). Audit trail functionality logs all user-initiated configuration changes, including operator ID, timestamp, and pre-/post-value deltas—meeting baseline requirements for ISO/IEC 17025 laboratory information management system (LIMS) integration.
Applications
- Ambient air quality monitoring networks operated by municipal and provincial ecological environment bureaus.
- Industrial emission compliance verification at stack-perimeter and community fence-line locations.
- Temporary high-resolution monitoring during construction, demolition, or hazardous material spill events.
- Long-term epidemiological exposure assessment studies requiring spatially distributed, temporally consistent PM₂.₅/PM₁₀ time-series.
- Calibration and collocation validation of lower-cost optical particle counters (OPCs) and low-power sensor networks.
- Indoor-outdoor penetration factor analysis when deployed in paired configurations with indoor units.
FAQ
Does the TH-2000PM require periodic filter tape replacement? How often?
Yes—filter tape is consumable and typically replaced every 14–30 days depending on site-specific aerosol loading. The instrument automatically detects tape end-of-life and triggers visual/remote alerts.
Is the beta-ray source licensed for international shipment?
The 14C source is exempt from IAEA Category 5 regulatory controls under SSR-6 Annex III; however, import licensing may apply per national radiation safety authority requirements (e.g., NRC in USA, ONR in UK). Documentation provided upon order.
Can the instrument operate on solar power?
Yes—when configured with optional DC 12 V input and external charge controller, it supports off-grid operation with appropriate battery bank sizing (≥50 Ah recommended for 72-h autonomy).
What QA/QC procedures are recommended for field deployment?
Daily zero/span checks using clean air and NIST-traceable PM calibration aerosols (e.g., Arizona Road Dust A2) are advised per HJ 653–2013. Biweekly flow calibration and quarterly beta-source activity verification are required for long-term data integrity.
Is raw beta attenuation data accessible via serial interface?
Yes—Modbus RTU register map includes raw detector counts, tape position index, heater temperature, and flow sensor voltage, enabling third-party algorithm development and metrological traceability verification.
