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简单介绍：
硫化氢快速气体检测管4LK，Measuring Range 1 to 2 ppm 2 to 20 ppm 20 to 40 ppm Number of Pump Strokes 2 1 1/2 Correction Factor 1/2 1 2 Sampling Time 1 minute per pump stroke Detecting
详情介绍：
硫化氢快速气体检测管4LK
Hydrogen sulphide No.4LK
H2S
| Performance |
MeasuringRange | 1 to 2 ppm | 2 to 20 ppm | 20 to 40 ppm |
Number of Pump Strokes | 2 | 1 | 1/2 |
CorrectionFactor | 1/2 | 1 | 2 |
SamplingTime | 1 minute per pumpstroke | ||
DetectingLimit | 0.25 ppm (n=2) | ||
ColorChange | White → Brown | ||
ReactionPrinciple | H2S + Pb(CH3COO)2 → PbS +2CH3COOH | ||
| Coefficient ofVariation | 10% (for2 to 6 ppm), 5% (for 6 to 20 ppm) | ||
| ShelfLife | 3Years | ||
| Correctionsfor temperature & humidity | Unnecessary | ||
| Store the tubes at cool and darkplace. | |||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Mercaptans | - | No effect | Nodiscoloration |
Sulfurdioxide | 1/2 time | Plus error | Nodiscoloration |
Nitrogendioxide | 1/4 time | Minus error | Nodiscoloration |
Ozone | 10 ppm | Bleaching | Nodiscoloration |
| Othersubstance measurable with this detector tube |
| Calibration gasgeneration | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 10ppm | 15ppm | 4.0to 44% |