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简单介绍：
甲醛检测管91M HCHO Formaldehyde，Measuring Range 8 to 20ppm 20 to 2000ppm 2000 to 6400ppm Number of Pump Strokes 2 1 1/2 Correction Factor 0.4 1 3.2 Sampling，甲醛检测管价格
详情介绍：
甲醛检测管91M HCHO Formaldehyde
Formaldehyde No.91M
HCHO
| Performance |
Measuring Range | 8 to 20ppm | 20 to 2000ppm | 2000 to 6400ppm |
Number of Pump Strokes | 2 | 1 | 1/2 |
Correction Factor | 0.4 | 1 | 3.2 |
Sampling Time | 1.5 minutes per pump stroke | ||
Detecting Limit | 4 ppm (n=2) | ||
Color Change | Yellow → Red | ||
Reaction Principle | 3HCHO + (NH2OH)3H3PO4 → H3PO4 | ||
| Coefficient of Variation | 10% (for 8 to 200 ppm), 5% (for 500 to 2000 ppm) | ||
| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity | Temperature correction is necessary | ||
| Store the tubes in the refrigerator to keep at 10oC (50oF) or below. | |||
| Possible coexisting substances and their interferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Acrolein | 5 times | Plus error | Produces red stain at 20 ppm |
Acetaldehyde | 1/6 time | Plus error | Produces red stain at 3 ppm |
| Other substance measurable with this detector tube |
| Calibration gas generation | Diffusion tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 0.3ppm | 7.0 to 73% |