Gastec 4LT Quick-measuring Detector tubes Hydrogen sulphide H2S (0.1-4 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model4LT
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Indicator: 0.2~2.0ppm
Measuring Range:
+ 0.05 to 0.1 ppm, Number of Pump Strokes 2
+ (0.1) to 2.0 ppm, Number of Pump Strokes 1
+ 2.0 to 4.0 ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow →Pink
Coefficient of Variation: 5% (for 0.1 to 2.0 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.01 ppm (n=2) | |||
| Colour Change | Yellow →Pink | |||
| Reaction Principle |
Hydrogen Sulphide reacts with the reagent to form intermediate material which stains indicator pink |
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| Coefficient of Variation | 5% (for 0.1 to 2.0 ppm) | |||
| Shelf Life | 2 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia |  2.3 ppm |
 |
No discolouration |
| Ethyl Mercaptan | 0.5 ppm |
+ | Pink at 0.4 ppm |
| Hydrogen Chloride | 4.5 ppm |
+ | Pink at 4.0 ppm |
| Hydrogen Cyanide | 0.05 ppm |
+ | Pink at 0.05 ppm |
| Nitric Acid | 6.0 ppm |
+ | Pink at 5.0 ppm |
| Sulphur Dioxide | 10times |
+(dual layer) | Pale pink at 2.0 ppm |
| Nitrogen Dioxide | 5times |
|
Pink at 6.5 ppm |
| Hydrogen Fluoride | 12.0 ppm |
+ | Pink at 11.0 ppm |
| 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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