Hydrogen Cyanide (HCN) Detection Tubes (0.2 to 7 ppm)
Gastec Detection Tube No. 12LL measures Hydrogen Cyanide with a Range of 0.2 to 100 ppm.
- Measuring Range:
- Number of Pump Strokes: 2, 1
- Correction Factor: 1, 2
- Sampling Time: 1.5 minutes per pump stroke
- Detecting Limit: 0.05 ppm (2 pump strokes)
- Changes from Yellow to Pink
- Corrections for temperature & humidity: Unnecessary
- Reaction Principle:
- Hydrogen Cyanide reacts with the reagent to form intermediate material which stains indicator pink .
- Relative Standard Deviation: 5% (for 0.2 to 5 ppm)
- 2 Year Shelf Life
- Store the tubes at cool and dark place.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Ammonia |
≧ 2.2 ppm |
- |
No |
| Hydrogren chloride |
≧ 1.6 ppm |
+ |
Pink (≧ 2.0 ppm) |
| Nitric acid |
≧ 2.0 ppm |
+ |
Pink (≧ 3.0 ppm) |
| Sulfur dioxide |
≧ 0.5 ppm |
+ |
Pink (≧ 0.6 ppm) |
| Nitrogen dioxide |
≧ 5.0 ppm |
+ |
Pale pink (≧ 5.5 ppm) |
| Hydrogen fluoride |
≧ 10.0 ppm |
+ |
Pink (≧ 15.0 ppm) |
| Hydrogen sulfide |
|
+ |
Pink |
Hydrogen Cyanide (HCN) Detection Tubes (0.2 to 7 ppm)
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