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简单介绍：
二氯甲烷检测管138 Methylene chloride，Measuring Range 20 to 50 ppm 50 to 500 ppm，醋酸乙烯酯检测管143 Vinyl acetate，三氯乙烯检测管132M Trichloroethylene
详情介绍：
二氯甲烷检测管138 Methylene chloride
Methylene chloride No.138
CH2Cl2
| Performance |
Measuring Range | 20 to 50 ppm | 50 to 500 ppm |
Number of Pump Stroke | 2 | 1 |
Correction Factor | 0.4 | 1 |
SamplingTime | 3 minutes per pumpstroke | |
DetectingLimit | 10 ppm (n=2) | |
ColorChange | White → PalePink | |
ReactionPrinciple | CH2:Cl2 + CrO3 + H2S2O7 → Cl2 | |
| Coefficient ofVariation | 15% (for 50 to 100ppm), 10% (for 100 to 500 ppm) | |
| ShelfLife | 3Years | |
| Correctionsfor temperature & humidity | Temperature correction is necessary | |
| Store the tubes at cool and darkplace. | ||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Cl2, Br2, I2 | - | Plus error | Discolors palepink |
Unsaturatedhalogenated HCs | - | Plus error | Discolors palepink |
Saturatedhalogenated HCs | - | Plus error | Discolors palepink |
| Othersubstance measurable with this detector tube |
Substance | CorrectionFactor | PumpStrokes | MeasuringRange |
Ethyl Chloride | 0.3 | 1 | 15 to 150ppm |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| 50ppm | - | 15.5 to 66.9% |