Tianhong TH-110F Dual-Channel 24-Hour Constant-Temperature and Constant-Flow Air Sampler

Overview

The Tianhong TH-110F Dual-Channel 24-Hour Constant-Temperature and Constant-Flow Air Sampler is an engineered solution for regulatory-compliant ambient air sampling in environmental monitoring, occupational health, and public health surveillance applications. Designed to operate under field conditions with high reproducibility and long-term stability, the instrument implements precision volumetric flow control via dual independent diaphragm pump circuits—each equipped with real-time pressure compensation and temperature-stabilized flow measurement. Its core operational principle adheres to the gravimetric and volumetric sampling protocols defined in HJ/T 375–2007 (Technical Requirements and Test Methods for Ambient Air Samplers) and JJG 956–2000 (Verification Regulation for Atmospheric Samplers), ensuring traceable metrological performance aligned with Chinese national environmental monitoring standards. The TH-110F maintains constant flow across variable filter media resistance and ambient temperature fluctuations (via integrated thermal regulation), minimizing sampling bias caused by flow decay—a critical requirement for PM_2.5, PM₁₀, VOCs, and gaseous pollutant (e.g., SO₂, NO_x) collection per EPA Method IO-3.1, ISO 7708, and EN 12341.

Key Features

• Dual independent sampling channels with imported diaphragm pumps, enabling simultaneous or sequential sampling without cross-interference;
• Microprocessor-controlled constant-flow algorithm with automatic backpressure compensation up to 25,000 Pa;
• Integrated temperature stabilization module to maintain consistent flow output across ambient temperatures from –10 °C to +45 °C;
• High-accuracy digital flowmeter calibrated to ±0.1% full-scale reading, with real-time flow display and logging;
• Programmable sampling modes: fixed-duration (0–24 h), interval-based cycling, and scheduled start/stop—all with ±1% timing fidelity;
• Rechargeable Li-ion battery pack supporting continuous operation up to 24 hours at 0.5 L/min; AC/DC dual-power architecture for lab and field deployment;
• Non-volatile memory retains all sampling parameters—including flow setpoints, duration, date/time stamps—even after power loss.

Sample Compatibility & Compliance

The TH-110F accommodates standard 47-mm and 90-mm diameter filter substrates (quartz fiber, PTFE, PVC, Teflon®), sorbent tubes (e.g., Tenax®, Carbopack™), and impingers for gaseous analyte capture. It meets mechanical and metrological requirements of HJ/T 375–2007 and JJG 956–2000, and its flow control architecture supports data integrity for audits under China’s Environmental Monitoring Technical Specifications (HJ 194–2017). While not certified to IEC 61000-6-2/6-4 or ATEX, the unit complies with GB/T 18204.1–2013 for indoor air quality monitoring setups. Its design facilitates integration into GLP-aligned workflows through timestamped, tamper-resistant parameter logs.

Software & Data Management

Data acquisition is managed via embedded firmware with RS-232 serial interface (optional USB adapter available). Field-collected metadata—including actual flow rate, cumulative volume, elapsed time, battery voltage, and pump duty cycle—is stored in binary format with UTC-synchronized timestamps. Exportable CSV files support post-processing in Excel, R, or EPA’s AirData tools. Firmware version 2.3+ includes audit-trail functionality: all parameter changes are logged with operator ID (if enabled), time, and pre-/post-values—supporting basic 21 CFR Part 11 readiness when paired with validated PC-based configuration software (sold separately).

Applications

• Ambient air quality monitoring networks (PM_2.5/PM₁₀ mass concentration determination per HJ 618–2011);
• Workplace exposure assessment for respirable dust and airborne metals (OSHA ID-121, NIOSH 0500/0600);
• Indoor air quality surveys in schools, hospitals, and office buildings;
• Source emission characterization during short-term stack or fugitive emission studies;
• Calibration verification of continuous ambient analyzers (e.g., beta attenuation monitors, chemiluminescence NO_x analyzers);
• Method validation and inter-laboratory comparison exercises under CNAS accreditation scope.

FAQ

Does the TH-110F comply with U.S. EPA or EU reference methods?
It is designed to meet Chinese national standards (HJ/T 375–2007, JJG 956–2000) and supports equivalent sampling protocols used in EPA IO-3.1 and EN 12341—but it is not EPA-certified or CE-marked as a standalone reference method device.
Can the instrument operate unattended for 24 hours at maximum flow?
Yes—when configured at 1.0 L/min against ≤25,000 Pa system resistance, the TH-110F sustains stable flow for 24 h on a fully charged battery, with <±1% time accuracy and <±5% flow deviation.
Is flow calibration traceable to national standards?
Each unit undergoes factory calibration using a NIST-traceable primary standard rotameter or critical orifice bank; calibration certificates list uncertainty budgets per ISO/IEC 17025 guidelines.
What maintenance intervals are recommended?
Diaphragm pumps require inspection every 6,000 operating hours; inlet filters should be replaced before each sampling campaign; flow sensor cleaning is advised quarterly under high-dust conditions.
Is remote monitoring or IoT integration supported?
No native Wi-Fi or cellular telemetry is built-in; however, the RS-232 port enables connection to third-party SCADA or data loggers via MODBUS RTU (custom protocol mapping required).