Hydrogen Sulfide (H2S) Detection Tubes (0.25 to 120 ppm)
Gastec Detection Tube No. 4LL measures Hydrogen Sulfide with a Range of 0.25 to 120 ppm.
- Measuring Range: 0.25 to 2.5 ppm
- Number of Pump Strokes: 2 to 10, 1, 1/2
- Correction Factor: 1/2 to 1/10, 1, 2
- Sampling Time: 1 minute per pump stroke
- Detecting Limit: 0.1 ppm (10 pump strokes)
- Changes from White to Brown
- Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
- Relative Standard Deviation: 5% (for 2.5 to 60 ppm)
- 3 Year Shelf Life
- Store the tubes at a cool and dark place.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Nitrogen dioxide |
≧ 1/4 |
- |
No |
| Sulfur dioxide |
≧ 1/1 |
+ |
No |
| Ozone |
|
Bleaching |
No |
| Hydrogen cyanide |
|
No |
No |
| Mercaptans |
|
No |
No |
Hydrogen Sulfide (H2S) Detection Tubes (0.25 to 120 ppm)
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