万喜堂彩票 
万喜堂彩票
简单介绍： 万喜堂app下载网页版 硫化氢气体检测仪 4LT H2S，Measuring Range 0.1 to 0.2 ppm 0.2 to 2.0 ppm 2.0 to 4.0 ppm Number of Pump Strokes 2 1 1/2 Correction Factor 1/2 1 2 Sampling Time 1 minute per pump ......
| Performance |
| MeasuringRange | 0.1 to 0.2 ppm | 0.2 to 2.0 ppm | 2.0 to 4.0 ppm |
| Number of Pump Strokes | 2 | 1 | 1/2 |
| CorrectionFactor | 1/2 | 1 | 2 |
| SamplingTime | 1 minute per pumpstroke | ||
| DetectingLimit | 0.05 ppm (n=2) | ||
| ColorChange | Pale Yellow → ReddishBrown | ||
| ReactionPrinciple | H2S + HgCl2 → HSHgCl + HCl | ||
| Coefficient ofVariation | 10% (for 0.2 to 0.5ppm), 5% (for 0.5 to 2 ppm) | ||
| ShelfLife | 2Years | ||
| Correctionsfor temperature & humidity | Temperature correction is necessary | ||
| Store the tubes inthe refrigerator to keep at 10oC (50oF) orbelow. | |||
| Possible coexisting substances and theirinterferences | (NOTE) |
| Substance | Concentration | Interference | Change color by itself |
| Ammonia | - | No effect | Nodiscoloration |
| Sulfurdioxide | - | No effect | Nodiscoloration |
| Nitrogendioxide | - | No effect | Nodiscoloration |
| Mercaptans | 1/10 time | Plus error | Produce reddish browncolor |
| Methylsulfide | - | No effect | Nodiscoloration |
| Othersubstance measurable with this detector tube |
| Calibration gasgeneration | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 10ppm | 15ppm | 4.0to 44% |
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