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| Brand | 2B Technologies |
|---|---|
| Origin | USA |
| Model | 205 |
| Instrument Type | Portable |
| Measurement Range | 1 ppb–100 ppm (auto-ranging across 1 ppb–10 ppm, 1–10 ppm, and 10–100 ppm sub-ranges) |
| Detection Limit | 1 ppb |
| Accuracy | ±2% or ±1 ppb (whichever is greater) |
| Response Time (t₉₀) | 2 s |
| Sampling Flow Rate | 1.0 L/min |
| Data Storage Capacity | 20,480 data points |
| Logging Intervals | Configurable (2 s, 10 s, 1 min, 5 min, 1 h) |
| Power Supply | 12 VDC or 120/240 VAC |
| Dimensions | 9 cm × 21 cm × 29 cm |
| Weight | 0.9 kg (instrument only) |
| Output Interfaces | RS-232 serial, 0–2.5 VDC analog, built-in LCD display |
| Compliance | Designed for field-deployable environmental monitoring per EPA TO-11A guidance principles and ISO 13964:2022 (ambient air—determination of ozone by UV photometry) |
| Brand | BJBY |
|---|---|
| Origin | Beijing, China |
| Model | JC-RAD-14 |
| Sampling Method | Active Pump-aspiration |
| Measurement Range | Air Radon: 3–150,000 Bq/m³ |
| Soil Radon | 300–400,000 Bq/m³ |
| Radon Exhalation Rate | 0.001–10.000 Bq/(m²·s) |
| Water Radon | 0.003–100 Bq/L |
| Detection Repeatability | ≤5% (at 1800 Bq/m³, 65% RH, 25°C) |
| 8-h Drift | ≤10% |
| Power | Rechargeable Li-ion battery (≥30 h continuous operation) or AC adapter |
| Operating Temperature | −10°C to +40°C |
| Relative Humidity | ≤98% RH |
| Display | Backlit dot-matrix LCD |
| Data Storage | >200,000 records |
| Flow Rate | Up to 3 L/min (peak) |
| Communication Interfaces | USB, RS232, RS485, TCP/IP, Industrial Wireless |
| Inlet/Outlet Fittings | Anodized Aluminum |
| Self-background Count Rate | ≤0.3 cpm |
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