| Hydrogen cyanide | HCN | NO.12M |
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| Performance |
|
Measuring Range |
17 to 50 ppm |
50 to 800 ppm |
800 to 2400 ppm |
|
Number of Pump Strokes |
2 |
1 |
1/2 |
|
Correction Factor |
1/3 |
1 |
3 |
|
Sampling Time |
1 minute per pump stroke |
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|
Detecting Limit |
1 ppm (n=2) |
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|
Color Change |
Yellow |
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Reaction Principle |
Hydrogen cyanide reacts with mercuric Chloride to form |
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| Coefficient of Variation |
10% (for 50 to 200 ppm), 5% (for 200 to 800 ppm) |
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| Shelf Life | 3 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 color by itself |
|
Hydrogen sulfide |
500 ppm |
Plus error |
Red discoloration |
|
Sulfur dioxide |
500 ppm |
Plus error |
Red discoloration |
| Calibration gas generation | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 4.7 ppm | 5.6 to 40% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Red
Hg(CN)2+ 2HCl HCl + Base 
Chloride product