Gastec 131L 快速偏二氯乙烯测量探测管 CH2：CCl2（0.1-6.6ppm）
制造商: Gastec Model: 131L - 联系
Indicator: 0.2 to 3.0 ppm
Measuring Range:
+ 0.1 to 0.2 ppm, Number of Pump Strokes 4
+ 0.2 to 3.0 ppm, Number of Pump Strokes 2
+ 3.0 to 6.6 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CHCl + Cr6+ + H2SO4 → HCl, HCl + Base → Chlorides
Coefficient of Variation: 10% (for 0.2 to 1.0 ppm), 5% (for 1.0 to 3.0 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Details
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 | 0.02 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 0.2 to 1.0 ppm), 5% (for 1.0 to 3.0 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 |
| Ethylene |  200 ppm |
 |
No |
| Tetrachloroethylene | 1/3 |
+ | Reddish brown |
| Trichloroethylene | 1/5 |
+ | Reddish brown |
| Benzene, Toluene | 200 ppm |
|
No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Allyl chloride | Factor: 16 | 2 | 3.2 to 48 ppm |
| 1,1,2,2-Tetrachloroethane | Factor: 10 | 2 | 2 to 30 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm (2014) | - | 3.6 to 23% |
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