Mercaptans Detection Tubes (0.5 to 120 ppm)
Gastec Detection Tube No. 70 measures Mercaptans with a Range of 0.5 to 120 ppm.
- Measuring Range: 0.5 to 5 ppm, 5 to 120 ppm
- Number of Pump Strokes: 2 to 10, 1
- Correction Factor: 1/2 to 1/10, 1
- Sampling time: 1.5 minutes per pump stroke
- Detecting Limit: 0.2 ppm (10 pump strokes)
- Changes from White to Yellow
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle: 2R･SH+ PdSO4 → (RS)2Pd + H2SO4
- Relative Standard Deviation: 10% (for 5 to 40 ppm), 5% (for 40 to 120 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, Ethylene |
≧ 2000 ppm |
+ |
Pale brown (whole layer) |
| Carbon monoxide |
≧ 2000 ppm |
+ |
Pale brown (whole layer) |
| Hydrogen sulfide |
≧ 500 ppm |
+ |
No |
Other substance measurable with this detector tube:
| Substance: |
Correction Factor: |
No. of Pump Strokes: |
Measuring Range: |
| Ethyl mercaptan |
1.0 |
1 to 10 |
0.5 to 120 ppm |
| Isopropyl mercaptan |
2.0 |
1 |
10 to 240 ppm |
| Methyl mercaptan |
0.7 |
1 to 10 |
0.35 to 84 ppm |
| Propyl mercaptan |
4.5 |
1 |
22.5 to 540 ppm |
Mercaptans Detection Tubes (0.5 to 120 ppm)
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