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| Brand | Tianwei Environmental (TW) |
|---|---|
| Origin | Shandong, China |
| Manufacturer | Yes |
| Model | TW-FZ3 |
| Measurement Principle | Asymmetric Capacitive Collector with Gerdien Tube Design |
| Negative Ion Range | 0–500,000 ions/cm³ (typical ambient range) |
| Resolution | 1 ion/cm³ |
| Accuracy | ±10% of reading (calibrated against NIST-traceable reference ion generator) |
| Temperature | −40°C to +60°C (±0.3°C) |
| Humidity | 0–100% RH (±0.3% RH, capacitive sensor) |
| Wind Direction | 0–360° (±2°, ultrasonic anemometer) |
| PM2.5 | 0–1000 µg/m³ (±10%, optical scattering) |
| Noise | 30–120 dB(A) (±1.5 dB, condenser microphone) |
| Oxygen Concentration | 0–100% vol (±3% vol, electrochemical sensor) |
| Data Storage | Local SD card or embedded flash — 1 year of raw 1-min interval data |
| Communication | GPRS / LTE Cat-1 / Fiber-optic (TCP/IP) |
| Power Supply | 220 VAC ±10% or optional solar + battery (12 VDC nominal) |
| Display | 2 m × 1 m P10 monochrome LED matrix (36 modules, 32 cm × 16 cm each) |
| Structural Frame | Dual carbon-steel uprights, flanged modular assembly, rated for Typhoon Level 15 (≥45 m/s) |
| Enclosure Rating | IP65 |
| Compliance | Meets GB/T 18801–2022 (Air Ion Detector General Requirements), HJ 93–2013 (Ambient Air Particulate Matter Monitoring), and supports HJ 212–2017 (Data Transmission Protocol for Environmental Monitoring) |
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