Gastec 130L 快速偏二氯乙烯测量探测管CH2：CCl2（0.4~40.6 ppm）
制造商: Gastec Model: 130L - 联系
Indicator: 1 to 14 ppm
Measuring Range:
+ 0.4 to 1 ppm, Number of Pump Strokes 2
+ 1 to 14 ppm, Number of Pump Strokes 1
+ 14 to 40.6 ppm, Number of Pump Strokes 1/2 (45 seconds per of pumb stroke)
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CCl2 + Cr6+ + H2SO4 → HCl, HCl+ Base → Reddish brown product
Coefficient of Variation: 10% (for 1 to 4 ppm), 5% (for 4 to 14 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 |
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| Detecting Limit | 0.1 ppm (n=2) | |||
| Colour Change | Yellow → Reddish brown | |||
| Reaction Principle | CH2:CCl2 + Cr6+ + H2SO4 → HCl HCl+ Base → Reddish brown product |
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| Coefficient of Variation | 10% (for 1 to 4 ppm), 5% (for 4 to 14 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 | ≧ 300 ppm |  |
No |
| Vinyl chloride | ≧ 1/7 | + | Reddish brown |
| Tetrachloroethylene | ≧ 4 times | + | Reddish brown |
| Trichloroethylene | ≧ 1/1 | + | Reddish brown |
| Toluene | ≧ 500 ppm | |
No |
| Benzene | ≧ 400 ppm | |
No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 5 ppm(2014) | - | 5.6 to 11.4% |
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