甲醛檢測管91 Formaldehyde HCHO
Formaldehyde No.91
HCHO
| Performance |
Measuring Range | 2 to 20ppm | 20 to 50ppm | 50 to 100ppm |
Number of Pump Strokes | 2 | 1 | 1/2 |
Correction Factor | 1 | 2.5 | 5 |
Sampling Time | 1 minute per pump stroke | ||
Detecting Limit | 0.5 ppm (n=2) | ||
Color Change | White → Brown | ||
Reaction Principle | HCHO + C6H4(CH3)2 + H2S2O7 → Condensation Polymer | ||
| Coefficient of Variation | 15% (for 2 to 6 ppm), 10% (for 6 to 20 ppm) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Unnecessary | ||
| Store the tubes at cool and dark place. | |||
| Possible coexisting substances and their interferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Aldehydes | 1/2 time | Plus error | Produce brown stain |
Esters, Ethers | 1000 ppm | Plus error | No discoloration |
Ketones | 1000 ppm | Plus error | No discoloration |
Styrene | 500 ppm | Plus error | Yellow at 500 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% |
Formaldehyde No.91
HCHO
| Performance |
Measuring Range | 2 to 20ppm | 20 to 50ppm | 50 to 100ppm |
Number of Pump Strokes | 2 | 1 | 1/2 |
Correction Factor | 1 | 2.5 | 5 |
Sampling Time | 1 minute per pump stroke | ||
Detecting Limit | 0.5 ppm (n=2) | ||
Color Change | White → Brown | ||
Reaction Principle | HCHO + C6H4(CH3)2 + H2S2O7 → Condensation Polymer | ||
| Coefficient of Variation | 15% (for 2 to 6 ppm), 10% (for 6 to 20 ppm) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Unnecessary | ||
| Store the tubes at cool and dark place. | |||
| Possible coexisting substances and their interferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Aldehydes | 1/2 time | Plus error | Produce brown stain |
Esters, Ethers | 1000 ppm | Plus error | No discoloration |
Ketones | 1000 ppm | Plus error | No discoloration |
Styrene | 500 ppm | Plus error | Yellow at 500 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% |
