产品分类
PRODUCT CENTER
联系我们
销售电话：时经理
18121126516
021-64835787
产品详情
简单介绍：
硫化氢气体检知管4M H2S，Measuring Range 12.5 to 25 ppm 25 to 250 ppm 250 to 500 ppm Number of Pump Strokes 2 1 1/2 Correction Factor 1/2 1 2 Sampling Time 30 seconds硫化氢气体检知管价格
详情介绍：
硫化氢气体检知管4M H2S
Hydrogen sulphide No.4M
H2S
| Performance |
Measuring Range | 12.5 to 25 ppm | 25 to 250 ppm | 250 to 500 ppm |
Number of Pump Strokes | 2 | 1 | 1/2 |
Correction Factor | 1/2 | 1 | 2 |
Sampling Time | 30 seconds per pump stroke | ||
Detecting Limit | 2.5 ppm (n=2) | ||
Color Change | White → Brown | ||
Reaction Principle | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH | ||
| Coefficient of Variation | 5% (for 25 to 250 ppm) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Unnecessary | ||
| Store the tubes at cool and dark place. | |||
| Possible coexisting substances and their interferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Nitrogen dioxide | 1/4 timer | Minus error | No discoloration |
Sulfur dioxide | 1 time | Plus error | No discoloration |
Mercaptans | - | No effect | No discoloration |
| Other substance measurable with this detector tube |
| Calibration gas generation | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 10ppm | 15ppm | 4.0 to 44% |