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简单介绍：
二氯甲烷检知管138L Methylene chloride，二氯甲烷检知管138LCH2Cl2 Methylene chloride，Measuring Range 10 to 60 ppm 60 to 150 ppm气体检测管有一氧化碳、硫化氢、氨、甲醛、苯 、苯系物中苯 、甲苯 、二甲苯 、二氧化硫、氮氧化物、汽油 、液化石油汽 、氯气 、氯化氢、二氧化碳、磷化氢、二硫化碳、臭氧 、氟化氢
详情介绍：
二氯甲烷检知管138L Methylene chloride
Methylene chloride No.138L
CH2Cl2
| Performance |
MeasuringRange | 10 to 60 ppm | 60 to 150 ppm |
Number of PumpStroke | 2 | 1 |
CorrectionFactor | 1 | 2.5 |
Sampling Time | 3 minutes per pumpstroke | |
Detecting Limit | 5 ppm (n=2) | |
Color Change | White → PalePink | |
Reaction Principle | CH2:Cl2 + CrO3 + H2S2O7 → Cl2 | |
| Coefficient ofVariation | 15% (for10 to 20 ppm), 10% (for 20 to 60 ppm) | |
| ShelfLife | 2Years | |
| 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 | 6 ppm | Plus error | Discolors palepink |
Saturatedhalogenated HCs | 3 ppm | Plus error | Discolors palepink |
| Othersubstance measurable with this detector tube |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| 50ppm | - | 15.5 to 66.9% |