Gastec 12LL Quick-measuring Detector tubes Hydrogen cyanide HCN (0.2~10ppm)
ManufacturerGastec(View more products from this manufacturer)
Model12LL
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Vạch chỉ thị: 0.2 ~ 5 ppm
Thang đo:
+ 0.2 ~ 5 ppm, bơm 2 lần
+ 5 ~ 10 ppm, bơm 1 lần
Thời gian lấy mẫu: 1.5 phút mỗi lần bơm
Chuyển đổi màu: vàng sang hồng
Hệ số biến đổi: 5% (0.2 ~ 5 ppm)
Số ống trong hộp: 10
Dùng thích hợp với bơm: GV-100S/110S
Performance
| Measuring Range | 0.2 to 5 ppm | 5 to 10 ppm |
| Number of Pump Strokes | 2 | 1 |
| Correction Factor | 1 | 2 |
| Sampling Time | 1.5 minutes per pump stroke | |
| Detecting Limit | 0.05 ppm (n=2) | |
| Colour Change | Yellow → Pink | |
| Reaction Principle | Hydrogen Cyanide reacts with the reagent to form intermediate material which stains indicator pink . | |
| Coefficient of Variation | 5% (for 0.2 to 5 ppm) | |
| Shelf Life | 2 Years | |
| Corrections for temperature & humidity | Unnecessary | |
| Store the tubes at cool and dark place. | ||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia |  2.2 ppm |
 |
No discolouration |
| Hydrogen Chloride | 1.6 ppm |
+ | Pink at 2.0 ppm |
| Nitric Acid | 2.0 ppm |
+ | Pink at 3.0 ppm |
| Sulphur Dioxide | 0.5 ppm |
+ | Pink at 0.6 ppm |
| Nitrogen Dioxide | 5.0 ppm |
+ | Pale pink at 5.5 ppm |
| Hydrogen Fluoride | 10.0 ppm |
+ | Pink at 15.0 ppm |
| Hydrogen Sulphide | + | Pink |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 4.7 ppm | 5.6 to 40% |
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