توضیحات
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
- (2.5) to 60 ppm
- 60 to 120 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 |
