Hydrogen |
NO.30 |
| H2 |  |
 |
Performance
| Measuring Range | 0.5 to 2.0 % |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 3 minutes per pump stroke |
| Detecting Limit | 0.5%(n=1) |
| Colour Change | Yellow → Yellowish brown |
| Reaction Principle | H2 + Na2Pd(SO3)2 → Pd + Na2SO3 + H2SO3 |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Unnecessary |
| Store the tubes at cool and dark place. | |
Special note
This is not a direct reading tube. Concentrations should be determined by using the concentration chart attached with this tube.
Possible coexisting substances and their interferences (NOTE)
| Substance | Interference | Change colour by itself to |
| Carbon monoxide, Hydrogen sulphide | Produce 2 layers (Yellowish brown and blackish brown) |
Dark brown |
| Acetylene | Produce 2 layers (Yellowish brown and blackish brown) |
Darkh brown |
| Ethylene | + | Blackish brown |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | 4 to 75% |
