Gastec 4M Quick-measuring Detector tubes Hydrogen sulphide H2S (12.5-500 ppm)
Manufacturer: Gastec Model: 4M - Contact
See more: Equipment Calibration-Inspection & Repair Service
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Indicator: 25 to 250 ppm
Measuring Range:
+ 12.5 to 25 ppm, Number of Pump Strokes 2
+ 25 to 250 ppm, Number of Pump Strokes 1
+ 250 to 500 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 5% (for 25 to 250 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Measuring Range |
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Number of Pump Strokes |
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Correction Factor |
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Sampling Time | 45 seconds per pump stroke | |||
Detecting Limit | 2.5 ppm (n=2) | |||
Colour Change | White → Brown | |||
Reaction Principle | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH | |||
Coefficient of Variation | 5% (for 25 to 250 ppm) | |||
Shelf Life | 3 Years | |||
Corrections for temperature & humidity | Unnecessary | |||
Store the tubes at cool and dark place. |
Substance | Concentration | Interference | Change colour by itself to |
Nitrogen dioxide | 1/4 | No | |
sulphur dioxide | 1/1 | + | No |
Mercaptans | No | No |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
1 ppm(2014) | 5 ppm(2014) | 4.0 to 44% |
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