Ambient Air Quality Monitor
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| Brand | Yuhong |
|---|---|
| Model | TH-2002H |
| Detection Principle | UV Fluorescence (214 nm excitation / 330 nm emission) |
| Detection Range | 0–10 ppm (selectable auto-ranging) |
| Resolution | 0.1 ppb |
| Accuracy | ±2% FS |
| Response Time (T90) | <60 s |
| Operating Temperature | −20 °C to +50 °C |
| Power Supply | Rechargeable Li-ion battery (≥10 h continuous operation) |
| Display | 7-inch capacitive touchscreen |
| Data Logging | Internal storage ≥12 months @ 5-min intervals |
| Compliance | Meets GB/T 15438–1995, EPA Method RFNA-01 (UV Fluorescence), ISO 7935:1990 (Ambient Air – SO₂ Measurement) |
| Brand | Yuhong |
|---|---|
| Model | TH-2004H |
| Measurement Principle | Gas Filter Correlation Infrared Absorption (GFC-IR) at 4.6 µm |
| Detection Range | Configurable across ppb to ppm levels |
| Output Units | ppb, ppm, µg/m³, mg/m³ |
| Display | 7-inch capacitive touchscreen |
| Data Logging | One record per 5 minutes with timestamped storage |
| Environmental Compensation | Automatic temperature and pressure compensation |
| Calibration | Remote zero/span calibration and internal diagnostic access |
| Compliance | Designed for ambient air monitoring per EPA Method TO-11A principles |
| Alarm Functions | Multi-threshold, user-configurable concentration alarms |
| Rotating Filter Wheel | Precision-machined, long-life CO/N₂ dual-channel correlation wheel |
| Signal Processing | Adaptive optimization algorithm for dynamic response time and SNR balancing |
| Software Interface | Menu-driven Chinese GUI with real-time waveform zoom, scaling, and historical trend replay |
| Data Export | USB mass storage or optional Ethernet/RS485 interface |