Guangming Physical Chemistry
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| Brand | Guangming Physical Chemistry |
|---|---|
| Origin | Beijing, China |
| Model | 251U |
| Detection Principle | Colorimetric Reaction with Pre-impregnated Reagent |
| Measurement Range (Standard 2-Stroke) | 1–30 ppm |
| Extended Range (4-Stroke) | 0.5–12.5 ppm |
| Sampling Volume | 200 mL (2 strokes) or 400 mL (4 strokes) |
| Response Time | 3 min (2 strokes) / 6 min (4 strokes) |
| Detection Limit | 0.3 ppm (4 strokes) |
| Color Transition | White → Pale Green |
| Operating Temperature | 0–40 °C (temperature correction required) |
| Compatible Pumps | AP-20, AP-20S, AP-1S, 400A, 400B |
| Calibration Gas | Undecane (C₁₁H₂₄) |
| Scale Reference | Calibrated for 2-stroke sampling (200 mL) |
| Temperature Correction Required | Yes (provided correction tables for both 2- and 4-stroke modes) |
| Brand | Guangming Physical Chemistry |
|---|---|
| Origin | Beijing, China |
| Model | 250S |
| Detection Range | 0.21–100 ppm |
| Resolution | 0.1 ppm |
| Principle | Colorimetric Reaction with Pre-impregnated Reagent |
| Required Accessories | AP-20 Hand Pump (sold separately) |
| Compliance | Designed for field use per ISO 8573-1 (air quality), ASTM D679 (standard practice for colorimetric gas detection tubes), and OSHA 29 CFR 1910.1200 (Hazard Communication) |