Gastec 131LB Quick-measuring Detector tubes Vinylidene chloride CH2:CCl2 (0.25-70ppm)
ManufacturerGastec(View more products from this manufacturer)
Model131LB
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Indicator: 1 to 20 ppm
Measuring Range:
+ 0.25 to 1 ppm, Number of Pump Strokes 4
+ 1 to 20 ppm, Number of Pump Strokes 2
+ 20 to 70 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Purple
Reaction Principle: CH2:CHCl + PbO2 + H2SO4 → HCl, HCl + Base → Purple
Coefficient of Variation: 10% (for 1 to 5 ppm), 5% (for 5 to 20 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 | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.05 ppm (n=4) | |||
| Colour Change | Yellow → Purple | |||
| Reaction Principle | CH2:CHCl + PbO2 + H2SO4 → HCl HCl + Base → Purple |
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| Coefficient of Variation | 10% (for 1 to 5 ppm), 5% (for 5 to 20 ppm) | |||
| Shelf Life | 2 Years | |||
| Corrections for temperature & humidity | Temperature correction is necessary | |||
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Chlorine, Hydrogen chloride | ≧ 1/10 | + | Purple |
| Alcohols, Esters, Ketones | No | No | |
| 1,2-Dichloroethylene | ≧ 1/10 | + | Purple |
| Trichloroethylene, Tetrachloroethylene |
≧ 1/10 | + | Purple |
| Aromatic hydrocarbons | No | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm (2014) | - | 3.6 to 23% |
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