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简单介绍：
甲醛气体检知管91LL Formaldehyde，Measuring Range 0.05 to 1.0 ppm Number of Pump Strokes 5 Correction Factor 1 Sampling Time 1.5 minutes per pump stroke Detecting Limit 0.03 ppm (n=5)甲醛气体检知管价格
详情介绍：
甲醛气体检知管91LL Formaldehyde
Formaldehyde No.91LL
HCHO
| Performance |
Measuring Range | 0.05 to 1.0 ppm |
Number of Pump Strokes | 5 |
Correction Factor | 1 |
Sampling Time | 1.5 minutes per pump stroke |
Detecting Limit | 0.03 ppm (n=5) |
Color Change | Yellowish Brown → Reddish Brown |
Reaction Principle | 3HCHO + (NH2OH)3H3PO4 → H3PO4 |
| Coefficient of Variation | 10% (for 0.05 to 0.3 ppm), 5% (for 0.5 to 1.0 ppm) |
| Shelf Life | 1 Year |
| 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 |
Ammonia | - | Minus error | Faint dull yellow color to whole layer |
Nitrogen dioxide | - | No effect | Pale pink discoloration around zero |
Aldehydes | 1/3 time | Plus error | Faint reddish brown to whole layer |
Ketones | 1:1 | Plus error | Faint reddish brown to whole layer |
Toluene | 10ppm | No effect | No discoloration |
| 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% |