甲醛檢測管NO. 91P
GASTEC為了滿足用戶在氣體檢測方面的需要，而開發出了電子自動采氣泵。用傳統的電子吸氣泵幾乎不能進行有效的采氣，因為檢測管里的填充試劑密度很高。而GASTEC開發的GSP電泵系列能提供強勁吸力，能滿足特定的檢測管的取樣要求。電泵和檢測管組成的新的檢測系統能適用于作業環境的檢測。甲醛檢測管NO. 91P，GASTEC甲醛檢測管NO. 91P氣體檢測管，甲醛HCHO檢測管NO. 91P,GASTEC甲醛檢測管NO. 91P電泵用氣體檢測管檢測范圍0.02-1.44ppm。
Formaldehyde
NO.91P
| HCHO |
Specifications
| Calibration Range | 0.02-0.4 ppm |
| Measuring range | 0.02-1.44 ppm |
| Sampling （flow） Rate | 200mL/min |
| Sampling Volume | 6000mL, 2000mL |
| Sampling Time | 30min, 10min. |
| Detecting Limit | 0.01 ppm |
| Colour Change | Yellow → pink |
| Corrections for temperature/humidity | Temperature |
| Shelf life | 1 year （in the refrigerator） |
| Accuracy | CV=5-10% （CV: Coefficient of variation = σ: standard deviation / mean value x 100） |
Possibly coexisting substances and their interferences
| Substance（s） | Interference | Colour change by itself |
| Ammonia | 2 ppm （or less） | No | No |
| Nitrogen dioxide | 1 ppm （or less） | No | No |
| Acetaldehyde | "+" error （higher reading） | produces pinkish discolouration | |
| Acetone | 0.3 ppm （or less） | No | Produces pinkish stain around tube opening （inlet） |
| Ethanol | No | No | |
| Ethyl acetate | No | No | |
| p-dichlorobenzene | No | No | |
| Toluene | No | No | |
Scrubber 1 （black）: removes acetone Scrubber 2 （purple）: Ammonia and nitrogen dioxide are removed. The presence of ammonia causes the purple scrubber 2 to turn yellow. The presence of nitrogen dioxide causes scrubber 2 to turn a darker shade of purple | |||
| Calibration gas generation | Diffusion tube method （analysis: by absorptiometry, acetylacetone method） |
Miscellaneous
| Electric sampling pump This detector tube is suited for measuring formaldehyde in indoor environments. The GSP-200 / GSP-300FT series automatic gas samplers （or comparable sampling devices/pumps） should always be used for optimal performance. A deviation of +/-10% in the sampling flowrate （i.e. amount of air flowing through the tube at a given moment） or the sampling amount （total sampled amount of target substance） causes an average margin of error of approx. +/-10% （maximum +/-20%） in the indicated value. Formaldehyde indoor concentration threshold: 0.08 ppm （mean value during 30 minutes） |
| TLV-TWA | TLV-S | Explosive range |
| -- -- | C0.3ppm | 7.0×73% |
