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18121126516
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氯乙烯气体检测管131La Vinyl chloride Vinyl chloride No.131LA
CH2:CHCl
| Performance |
MeasuringRange | 0.25to 0.5ppm | 0.5to 1ppm | 1to 20ppm | 20to 54ppm |
Number of Pump Strokes | 4 | 2 | 1 | 1/2 |
CorrectionFactor | 1/4 | 1/2 | 1 | 2.7 |
SamplingTime | 1 minute per pumpstroke | |||
DetectingLimit | 0.05 ppm (n=4) | |||
ColorChange | Yellow → Reddishbrown | |||
ReactionPrinciple | CH2:CHCl + Cr6+ + H2SO4 → HCl | |||
| Coefficient ofVariation | 10% (for1 to 6 ppm), 5% (for 6 to 20 ppm) | |||
| ShelfLife | 2Years | |||
| Correctionsfor temperature & humidity | Unnecessary | |||
| Store the tubes inthe refrigerator to keep at 10oC (50oF) orbelow. | ||||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Ethylene | 0.1% | Minus error | Nodiscoloration |
Tetrachloroethylene | 3 times | Plus error | Produce reddishbrown |
Trichloroethylene | 1/2 time | Plus error | Produce reddishbrown |
Toluene,Xylene | 500 ppm | Minus error | Nodiscoloration |
Benzene, | 400 ppm | Minus error | Nodiscoloration |
| Othersubstance measurable with this detector tube |
Substance | Correction | Pump Strokes | Measuring Range |
1,3-Dichloropropane | Factor: 0.5 | 2 | 0.5 to 10 ppm |
p-Ethylbenzylchloride | Factor: 2.5 | 2 | 2.5 to 50 ppm |
Ethylchloroformate | Factor: 7 | 2 | 7 to 140 ppm |
2-Methyl allylchloride | Factor: 2.75 | 1 | 2.8 to 55 ppm |
MethylChloroformate | Factor: 58 | 5 | 58 to 1160 ppm |
Propylenedichloride | Factor: 40 | 2 | 40 to 800 ppm |
1,2,4-Trichlorobenzene | Factor: 0.65 | 4 | 0.65 to 13ppm |
| Calibration gasgeneration | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm | - | 3.6 to 23% |