Gastec 171 Quick-measuring Detector tubes Acetylene
ManufacturerGastec(View more products from this manufacturer)
Model171
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Indicator: 0.2 to 2.0%
Measuring Range:
+ 0.05 to 0.1%, Number of Pump Strokes 2
+ 0.1 to 2.0%, Number of Pump Strokes 1
+ 2.0 to 4.0%, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: White → Brown
Reaction Principle: HCCH + I2O5→ H2S2O7 + I2
Coefficient of Variation: 15% (for 0.1 to 0.5 %), 10% (for 0.5 to 2 %)
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 | 45 seconds per pump stroke | |||
| Detecting Limit | 0.02 % (n=2) | |||
| Colour Change | White → Brown | |||
| Reaction Principle | HC CH + I2O5→ H2S2O7 + I2 |
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| Coefficient of Variation | 15% (for 0.1 to 0.5 %), 10% (for 0.5 to 2 %) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Temperature correction is necessary | |||
| Store the tubes in the cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Carbon monoxide | 0.1% | + | Brown( 0.1%) |
| Ethylene | 0.5% | + | Brown(0.5%) |
| More than C3 HCs | + | Brown |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Benzene | 0.3 | 4 | 0.03 to 0.6% |
| Ethylene | 1.0 | 1 | 0.1 to 2.0% |
| 1,1,1-Trichloroethane | 0.6 | 1 | 0.06 to 1.2% |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | 2.5 to 81% |
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