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简单介绍：
硫化氢气体检测管4HM H2S，Measuring Range 25 to 50 ppm 50 to 800 ppm 800 to 1600 ppm Number of Pump Strokes 2 1 1/2 Correction Factor 1/2 1 2 Sampling Time 1 minute per pump stroke Detecting硫化氢气体检测管价格
详情介绍：
硫化氢气体检测管4HM H2S
Hydrogen sulphide No.4HM
H2S
| Performance |
Measuring Range | 25 to 50 ppm | 50 to 800 ppm | 800 to 1600 ppm |
Number of Pump Strokes | 2 | 1 | 1/2 |
Correction Factor | 1/2 | 1 | 2 |
Sampling Time | 1 minute per pump stroke | ||
Detecting Limit | 5 ppm (n=2) | ||
Color Change | White → Brown | ||
Reaction Principle | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH | ||
| Coefficient of Variation | 5% (for 50 to 800 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 time | Minus error | No discoloration |
Sulfur dioxide | 1 time | Plus error | No discoloration |
Ammonia | - | No effect | No discoloration |
Carbon dioxide | - | No effect | No discoloration |
Carbon monoxide | - | No effect | No discoloration |
Mercaptans | - | No effect | No discoloration |
Organic gases & vapors | - | No effect | No discoloration |
| Other substance measurable with this detector tube |
| Calibration gas generation | High pressure gas cylinder method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 10ppm | 15ppm | 4.0 to 44% |