Gastec 172 Quick-measuring Detector tubes Ethylen C2H4 (25~1680 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model172
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Indicator: 50 to 800 ppm
Measuring Range:
+ 25 to 800 ppm, Number of Pump Strokes 1
+ 800 to 1680 ppm, Number of Pump Strokes 1/2
Sampling Time: 3 minute per pump stroke
Colour Change: Pale yellow → Blue
Reaction Principle: CH2:CH2 + (NH4)2MoO4 + PdSO4→ Molybdenum blue
Coefficient of Variation: 10% (for 25 to 200 ppm), 5% (for 200 to 800 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 |
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| Detecting Limit | 5 ppm (n=1) | ||
| Colour Change | Pale yellow → Blue | ||
| Reaction Principle | CH2:CH2 + (NH4)2MoO4 + PdSO4→ Molybdenum blue | ||
| Coefficient of Variation | 10% (for 25 to 200 ppm), 5% (for 200 to 800 ppm) | ||
| 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 |
| Ammonia, Hydrogen cyanide | + | White | |
| Carbon monoxide, Hydrogen | + | Blue (whole layer) | |
| Hydrogen chloride | + | Pink | |
| Hydrogen sulphide | + | Black | |
| Butadiene | + | White | |
| Butane, Pentane | + | Blue (whole layer) | |
| Butylene, Propylene | 1/4 | + | Blue |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Acetylene | 1.3 | 1 | 32.5 to 1040 ppm |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200ppm(2014) | - | 2.7 to 36% |
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