Gastec 131La Quick-measuring Detector tubes Vinylidene chloride CH2:CCl2 (0.25 ~ 54 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model131La
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Indicator: 1 to 20 ppm
Measuring Range:
+ 0.25 to 0.5 ppm, Number of Pump Strokes 4
+ 0.5~1ppm, Number of Pump Strokes 2
+ 1 to 20 ppm, Number of Pump Strokes 1
+ 20 to 54 ppm, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CHCl + Cr6+ + H2SO4 → HCl, HCl+ Base → Chlorides
Coefficient of Variation: 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm)
Nr. of tests: 5
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 | 0.05 ppm (n=4) | ||||
| Colour Change | Yellow → Reddish brown | ||||
| Reaction Principle | CH2:CHCl + Cr6+ + H2SO4 → HCl HCl+ Base → Chlorides |
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| Coefficient of Variation | 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm) | ||||
| Shelf Life | 2 Years | ||||
| Corrections for temperature & humidity | Unnecessary | ||||
| 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 |
| Ethylene |  0.1% |
 |
No |
| Tetrachloroethylene | 3 times |
+ | Reddish brown |
| Trichloroethylene | 1/2 time |
+ | Reddish brown |
| Toluene, Xylene | 500 ppm |
|
No |
| Benzene | 400 ppm |
|
No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| 1,3-Dichloropropane | Factor: 0.5 | 2 | 0.5 to 10 ppm |
| p-Ethyl benzylchloride | Factor: 2.5 | 2 | 2.5 to 50 ppm |
| Ethyl chloroformate | Factor: 7 | 2 | 7 to 140 ppm |
| 2-Methyl allyl chloride | Factor: 2.75 | 1 | 2.8 to 55 ppm |
| Methyl chloroformate | Factor: 58 | 5 | 58 to 1160 ppm |
| Propylene dichloride | Factor: 40 | 2 | 40 to 800 ppm |
| 1,2,4-Trichlorobenzene | Factor: 0.65 | 4 | 0.65 to 13 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm (2014) | - | 3.6 to 23% |
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