Gastec 128 Quick-measuring Detector tubes Stoddard Solvent (50 ~ 8000 mg/m3)
ManufacturerGastec(View more products from this manufacturer)
Model128
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Indicator: 50 ~ 8000 mg/m3
Measuring Range: 50 ~ 8000 mg/m3, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Brown (ring)
Reaction Principle: Stoddard Solvent + I2O5 + H2S2O7 → I2
Coefficient of Variation: 15% (for 50 to 1000 mg/m3), 10% (for 1000 to 8000 mg/m3)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range | 50 to 8000 mg/m3 |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 1.5 minutes per pump stroke |
| Detecting Limit | 5 mg/m3 (n=1) |
| Colour Change | White → Brown (ring) |
| Reaction Principle | Stoddard Solvent + I2O5 + H2S2O7 → I2 |
| Coefficient of Variation | 15% (for 50 to 1000 mg/m3), 10% (for 1000 to 8000 mg/m3) |
| 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 colour by itself to |
| Carbon monoxide | ≧0.1% | + | Pale brown (whole layer) |
| Acetylene, Hexane, Ethylene | ≧0.2% | + | Pale brown (whole layer) |
| Alcohols, Ketones,Esters | No | Pale brown (whole layer) | |
| Aromatic hydrocarbons | + | Dark green |
| Calibration gas generation | Vaper pressure method |
| TLV-TWA | TLV-STEL | Explosive range |
| 100ppm(2014) | - | 0.8 % or higher |
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