產品詳情
簡單介紹：
甲醛檢測管91D，GASTEC甲醛檢測管91D檢測范圍0.1-20ppm，檢測管檢測時間在1-10小時左右。甲醛檢測管91D采用自然擴散的方式。其特點：簡潔，輕巧，方便多用、直接讀數(shù)、不需取樣設備。
詳情介紹：
甲醛檢測管91D，GASTEC甲醛檢測管91D檢測范圍0.1-20ppm，檢測管檢測時間在1-10小時左右。甲醛檢測管91D采用自然擴散的方式。其特點：簡潔，輕巧，方便多用、直接讀數(shù)、不需取樣設備。
| 被動擴散式檢測管是用來測定較長時間下氣體濃度的時量平均值（TWA），采用自然擴散的方式。 這種檢測管里面填充有吸附劑及反應劑，氣體以一定的速率被均勻吸附，從而出現(xiàn)較為明顯均勻的變色。 檢測工作場所人員的有害氣體暴露量時，用右圖的檢測管夾（710）放置在人員衣領處即可。 檢測有害氣體在工作場所的分布時，把該檢測管固定放置一段時間后就可檢測出來。也可用來進行更長時間的檢測。 |
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特點
簡潔，輕巧，方便多用 直接讀數(shù) 不需取樣設備 |
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Formaldehyde |
NO.91D |
| HCHO |
Performance
| Measuring Range | 0.1 to 20 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.05 ppm (10 hours) |
| Colour Change | Yellow → Reddish Brown |
| Reaction Principle |
3HCHO + (NH2OH)3 H3PO4 → H3PO4 |
| Coefficient of Variation | 10% (for 1 to 20 ppm-hr) |
| Shelf Life | 1 Year |
| Corrections for temperature & humidity | Unnecessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | |
Possible coexisting substances and their interferences
| Substance | Interference | Change colour by itself to |
| Aldehydes, Ketones, Acid gases | + | Reddish brown |
Other substance measurable with this detector tube
| Substance | Correction Factor | Sampling Time | Measuring Range |
| Acetaldehyde | 1.0 | 1 to 10 hours | 0.1 to 20 ppm |
| Furfural | 3.0 | 1 to 10 hours | 0.3 to 60 ppm |
| Methyl ethyl ketone | 1.25 | 1 to 10 hours | 0.125 to 25 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 0.3 ppm | 7.0 to 73% |