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- 产品名称：甲醛检测管NO. 91P
- 产品型号：NO. 91P
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简单介绍
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。
产品描述
甲醛检测管NO. 91P
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。
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。
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-STEL | Explosive range |
| -- -- | C0.3ppm | 7.0×73% |
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