Gastec 142 Quick-measuring Detector tubes Butyl acetate CH3CO2C4H9 (0.05 ~ 0.8%)
ManufacturerGastec(View more products from this manufacturer)
Model142
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Indicator: 0.05 to 0.8%
Measuring Range: 0.05 to 0.8%, Number of Pump Strokes 2
Sampling Time: 45 seconds per pump stroke
Colour Change: Orange →Greenish brown
Reaction Principle: CH3CO2(CH2)3CH3 + Cr6+ H2SO4 → Cr3+
Coefficient of Variation: 15% (for 0.01 to 0.2 %), 10% (for 0.2 to 0.8 %)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range | 0.05 to 0.8% |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 45 seconds per pump stroke |
| Detecting Limit | 0.015% (n=2) |
| Colour Change | Orange →Greenish brown |
| Reaction Principle | CH3CO2(CH2)3CH3 + Cr6+ H2SO4 → Cr3+ |
| Coefficient of Variation | 15% (for 0.01 to 0.2 %), 10% (for 0.2 to 0.8 %) |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes at cool and dark place. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| sulphur dioxide |  100 ppm |
Two layers (Greenish brown & Pale brown) |
Brown(50 ppm) |
| Hydrogen sulphide | 100 ppm |
Two layers (Greenish brown & Pale brown) |
Greenish brown(25 ppm) |
| Alcohols, Esters, Ketones | + | Greenish brown | |
| Propane | 0.2% |
Cannot use | Pale brown for whole layer ( 0.2%) |
| Toluene | 25 ppm |
Two layers (Greenish brown & Pale brown) |
Pale brown(15 ppm) |
| Calibration gas generation | Static gas dilution method |
| TLV-TWA | TLV-STEL | Explosive range |
| 150 ppm(2015) | 200 ppm(2015) | 1.7 to 7.6% |
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