Gastec 174 快速1,3-丁二烯检测检测管 CH2：CHCH：CH2（50~800 ppm）
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Model174
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Indicator: 50 ~ 800 ppm
Measuring Range: 50 ~ 800 ppm, Number of Pump Strokes 1
Sampling Time: per pump stroke
Colour Change:
Reaction Principle:
Coefficient of Variation:
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range | 50 to 800 ppm |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 1.5 minutes per pump stroke |
| Detecting Limit | 10 ppm (n=1) |
| Colour Change | Pale yellow → White |
| Reaction Principle |
CH2:CHCH:CH2 + (NH4)2MoO4 + PdSO4 → White product |
| Coefficient of Variation | 10% (for 50 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 |
| Acetylene, Carbon monoxide | 10 ppm | + | Blue |
| Ammonia, Hydrogen cyanide | + | White | |
| Hydrogen | 20% | + | Blue (whole layer) |
| Hydrogen sulphide | 10 ppm | + | Black |
| Ethylene | 1 ppm | + | Blue |
| Styrene | + | Pale blue |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| 1,3-Pentadiene | 5.0 | 1 | 250 to 4000 ppm |
| Calibration gas generation | Static gas dilution method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm(2014) | - | 2.0 to 12% |
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