Hydrogen Sulfide (H2S) Detection Tubes (12.5 to 500 ppm)
Gastec Detection Tube No. 4M measures Hydrogen Sulfide with a Range of 12.5 to 500 ppm.
- Measuring Range:
- 12.5 to 25 ppm
- 25 to 250 ppm
- 250 to 500 ppm
- Number of Pump Strokes: 2, 1, 1/2
- Correction Factor: 1/2, 1, 2
- Sampling Time: 45 seconds per pump stroke
- Detecting Limit: 2.5 ppm (2 pump strokes)
- Changes from White to Brown
- Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
- Relative Standard Deviation: 5% (for 25 to 250 ppm)
- 3 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 |
| Nitrogen dioxide |
≧ 1/4 |
- |
No |
| Sulfur dioxide |
≧ 1/1 |
+ |
No |
| Mercaptans |
|
No |
No |
Hydrogen Sulfide (H2S) Detection Tubes (12.5 to 500 ppm)
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