Gastec 77 Quick-measuring Detector tubes tert-Butyl mercaptan & Dimethyl sulphide SH(CH3)3CSH (1 ~ 15 mg/m^3)
ManufacturerGastec(View more products from this manufacturer)
Model77
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Indicator: 1 ~ 15 mg/m^3
Measuring Range: 1 ~ 15 mg/m^3, Number of Pump Strokes 1
Sampling Time: 20 minute per pump stroke
Colour Change:
+ TBM tube: Yellow → Pink
+ DMS tube: Pink → Pale yellow
Reaction Principle:
+ (CH3)3CSH + HgCl2 → (CH3)CSHgCl + HCl,
+ HCl + Base → Chloride compound,
+ (CH3)2S + KMnO4 (Pink) → Pale yellow product
Coefficient of Variation: 10% (for 1 to 5 mg/m^3), 5% (for 5 to 15 mg/m^3)
Nr. of tests: 5
Pump: GV-100S/110S
Performance (Simultaneous detector tube)
| Detector Tube |
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| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 2 minutes per pump stroke | ||
| Detecting Limit | 0.2 mg/m3 (n=1) | ||
| Colour Change |
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| Reaction Principle | (CH3)3CSH + HgCl2 → (CH3)CSHgCl + HCl HCl + Base → Chloride compound (CH3)2S + KMnO4 (Pink) → Pale yellow product |
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| Coefficient of Variation | 10% (for 1 to 5 mg/m3), 5% (for 5 to 15 mg/m3) | ||
| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity | Temperature correction is necessary | ||
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | |||
Possible coexisting substances and their interferences (NOTE)
| TBM Tube | |||
| Substance | Concentration | Interference | Change colour by itself to |
| Hydrogen sulphide | + | Pink | |
| Mercaptans | + | Pink | |
| DMS Tube | |||
| Substance | Concentration | Interference | Change colour by itself to |
| Olefins | + | Pale yellow | |
| Tetrahydrothiophene | + | Pale yellow | |
| Calibration gas generation | TBM Tube:Diffusion tube method DMS Tube:Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| DMS:10ppm(2014) | - | - |
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