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GASTEC为了满足用户在气体检测方面的需要，而开发出了电子自动采气泵。用传统的电子吸气泵几乎不能进行有效的采气，因为检测管里的填充试剂密度很高。而GASTEC开发的GSP电泵系列能提供强劲吸力，能满足特定的检测管的取样要求。电泵和检测管组成的新的检测系统能适用于作业环境的检测。甲醛检测管NO. 91P，GASTEC甲醛检测管NO. 91P气体检测管，甲醛HCHO检测管NO. 91P,GASTEC甲醛检测管NO. 91P电泵用气体检测管检测范围0.02-1.44ppm。
Formaldehyde
NO.91P
| HCHO |
| 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） |
| 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） |
| 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% |
