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简单介绍：
7H 磷化氢检测管 Phosphine，Measuring Range 200 to 2500 ppm 2500 to 5500 ppm，多功能毒气体分析仪，突发事件气体检测箱，恶臭气体快速检测箱，便携式气体快速检测箱，试纸法，可用于各种状态的有害物质的测定，简便、快速、便于携带，一般可在数分钟内出结果
详情介绍：
7H 磷化氢检测管 Phosphine
Phosphine No.7H
PH3
| Performance |
Measuring Range | 200 to 2500ppm | 2500 to 5500ppm |
|
Number of Pump Strokes | 1 | 1/2 |
|
Correction Factor | 1 | 2.2 |
|
Sampling Time | 1 minute per pumpstroke | ||
Detecting Limit | 5 ppm(n=1) | ||
Color Change | Yellow → Darkbrown | ||
Reaction Principle | Phosphine reacts withpalladium to produce blackish discolouration | ||
| Coefficient ofVariation | 10% (for0.1 to 1 ppm), 5% (for 1 to 5 ppm) | ||
| ShelfLife | 2 Years | ||
| Correctionsfor temperature & humidity | Temperature correction is necessary | ||
| Store the tubes atcool and dark place. | |||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Ammonia |
| No | No |
Carbonmonoxide |
| + | Dark brown |
Carbondioxide |
| No | + |
| Othersubstance measurable with this detector tube |
| Calibration gasgeneration | High pressure gascylinder method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.3ppm | 1 ppm | - |