Methyl Mercaptan Detection Tubes (0.25 to 140 ppm)
Gastec Detection Tube No. 70 measures Methyl Mercaptan with a Range of 0.25 to 140 ppm.
- Measuring Range:
- 0.25 to 2.5 ppm
- (2.5) to 70 ppm
- 70 to 140 ppm
- Number of Pump Strokes: 2 to 10, 1, 1/2
- Correction Factor: 1/2 to 1/10, 1, 2
- Sampling Time: 1.5 minutes per pump stroke
- Detecting Limit: 0.1 ppm (10 pump strokes)
- Changes from White to Yellow
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle: 2CH3SH + PdSO4 → (CH3S)2Pd + H2SO4
- Coefficient of Variation: 10% (for 2.5 to 20 ppm), 5% (for 20 to 70 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 |
| Acetylene |
≧ 2000 ppm |
+ (Two layers) |
Pale brown (whole layer) |
| Carbon monoxide |
≧ 2000 ppm |
+ (Two layers) |
Pale brown (whole layer) |
| Ethylene |
≧ 2000 ppm |
+ (Two layers) |
Pale brown (whole layer) |
| Hydrogen sulfide |
≦ 500 ppm |
No |
No |
| Mercaptans |
|
+ |
Yellow |
Methyl Mercaptan Detection Tubes (0.25 to 140 ppm)
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