目錄:北京中恒日鑫科技有限公司>>日本氣體檢測管>> 3D日本gastec公司3D氨氣檢測管量程1.6-650ppm
| 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。也可用來進行長時間的檢測。 | |
特點 簡潔，輕巧，方便多用 直接讀數 不需取樣設備 圖例 A-切斷處 B-吸附劑 C-檢測劑 | 檢測管夾 No. 710 |
| Measuring Range | 2.5 to 1000 ppm |
| Sampling Hours | 0.5 to10 hours |
| Detecting Limit | 0.5 ppm (10 hours) |
| Colour Change | Purple → Yellow |
| Reaction Principle | 2NH3 + H2SO4 → (NH4)2SO4 |
| Coefficient of Variation | 10% (for 25 to 500 ppm-hr) |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes at cool and dark place. | |
| Substance | Concentration | Interference | Change colour by itself to |
| Amines, Hydrazine | + | Yellow | |
| Aromatic amines | No | No |
| Substance | Correction Factor | Sampling Time | Measuring Range |
| Dimethylamine | 0.75 | 0.5 to 10 hours | 1.9 to 750 ppm |
| N,N-Dimethylethylamine | 1.6 | 0.5 to 10 hours | 4 to 1600 ppm |
| Hydrazine | 0.65 | 0.5 to 10 hours | 1.6 to 650 ppm |
| Triethylamine | 2.1 | 0.5 to 10 hours | 5.3 to 2100 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | 35 ppm | 15 to 28% |
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