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| Brand | BJBY |
|---|---|
| Origin | Beijing, China |
| Model | BY-UV254 |
| Wavelength Range | 248–262 nm |
| Peak Wavelength | 254 nm |
| Measurement Range | 1 µW/cm² to 39.99 mW/cm² |
| Resolution | 1 µW/cm² |
| Spectral Band Rejection (Out-of-Band) | <0.1% |
| Accuracy | ±8% + 2 digits |
| Linearity Error | ±1% |
| Range Switching Error | ±1% |
| Sampling Rate | 2 Hz |
| Display | 3¾-digit LCD with backlight |
| Overload Indication | "OL" |
| Operating Temp./RH | 0–45 °C / 0–70% RH |
| Storage Temp./RH | −10–50 °C / 0–80% RH |
| Power | Three 3 V CR2032 coin cells |
| Battery Life | ~300 h (backlight off) |
| Auto Power-Off Delay | 5 min |
| Host Dimensions | 160 × 78 × 34 mm |
| Probe Dimensions | Ø50 × 40 mm |
| Telescopic Handle | 12 cm (single-stage), 24 cm (dual-stage) |
| Probe Cable Length | 1 m (including handle) |
| Weight | ~405 g (with batteries and probe) |
| Brand | BJBY |
|---|---|
| Origin | Beijing, China |
| Model | H5220(C) |
| Detection Limit | <1 µg/m³ (for benzene) |
| Repeatability | 1% |
| Linear Range | 10⁵ |
| Column Oven Temperature Range | Ambient to 200 °C (programmable) |
| Zero Drift | ≤1% FS/month |
| Span Drift | <1% FS/24 h |
| Power Supply | Internal Li-ion battery (6 h operation) |
| Operating Environment | −20 °C to +45 °C, 20–90% RH |
| Gas Inlet | 1/8″ stainless steel Swagelok fitting |
| Detector | Photoionization Detector (PID) |
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