Gastec 131 Quick-measuring Detector tubes Vinylidene chloride CH2:CCl2 (0.025~2 %)
ManufacturerGastec(View more products from this manufacturer)
Model131
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Indicator: 0.05 to 1 %
Measuring Range:
+ 0.025 to 0.05 %, Number of Pump Strokes 2
+ 0.05 to 1 %, Number of Pump Strokes 1
+ 1 to 2 %, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: Orange → Dark green
Reaction Principle: CH2:CHCl + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 10% (for 0.05 to 0.2 %), 5% (for 0.2 to 1 %)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
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| Sampling Time |
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| Detecting Limit | 0.005 % (n=2) | |||
| Colour Change | Orange → Dark green | |||
| Reaction Principle | CH2:CHCl + Cr6+ + H2SO4 → Cr3+ | |||
| Coefficient of Variation | 10% (for 0.05 to 0.2 %), 5% (for 0.2 to 1 %) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Organic solvents | + | Dark green |
| Calibration gas generation | Static gas dilution method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm (2014) | - | 3.6 to 23 % |
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