Hydrogen Sulfide (H2S) Detection Tubes (0.1 to 4.0 ppm)
Gastec Detection Tube No. 4LT measures Hydrogen Sulfide with a Range of 0.05 to 4.0 ppm.
- Measuring Range:
- 0.05 to 0.1 ppm
- (0.1) to 2.0 ppm
- 2.0 to 4.0 ppm
- Number of Pump Strokes: 2, 1, 1/2
- Correction Factor: 1/2, 1, 2
- Sampling Time: 1.5 minute per pump strokes
- Detecting Limit: 0.01 ppm (2 pump strokes)
- Changes from Yellow to Pink
- Corrections for temperature & humidity: Unnecessary
- 2 Year Shelf Life (in the refrigerator)
- Reaction Principle: Hydrogen sulfide reacts with the reagent to form intermediate material which stains indicator pink
- Relative Standard Deviation: 5% (for 0.1 to 2 ppm)
- Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Ammonia |
≧ 2.3 ppm |
- |
No |
| Ethyl mercaptan |
≧ 0.5 ppm |
+ |
Pink (≧ 0.4 ppm) |
| Hydrogen chloride |
≧ 4.5 ppm |
+ |
Pink (≧ 4.0 ppm) |
| Hydrogen cyanide |
≧ 0.05 ppm |
+ |
Pink (≧ 0.05 ppm) |
| Nitric acid |
≧ 6.0 ppm |
+ |
Pink (≧ 5.0 ppm) |
| Sulfur dioxide |
≧ 10 times |
+ (Two layers) |
Pale pink (≧ 2.0 ppm) |
| Nitrogen dioxide |
≧ 5 times |
- |
Pink (≧ 6.5 ppm) |
| Hydrogen fluoride |
≧ 12.0 ppm |
+ |
Pink (≧ 11.0 ppm) |
Hydrogen Sulfide (H2S) Detection Tubes (0.1 to 4.0 ppm)
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