Gastec 137 Quick-measuring Detector tubes Chloroform CHCl3 (4~400ppm)
ManufacturerGastec(View more products from this manufacturer)
Model137
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Indicator: 10 to 100 ppm
Measuring Range:
+ 4 to 10 ppm, Number of Pump Strokes 7
+ 10 to 100 ppm, Number of Pump Strokes 5
+ 100 to 400 ppm, Number of Pump Strokes 3
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Orange
Reaction Principle: CHCl3 + I2O5 + H2S2O7 → Cl2, Cl2 + o-Tolidine → Orange products
Coefficient of Variation: 15% (for 10 to 20 ppm), 10% (for 20 to 100 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | |||
| Detecting Limit | 1 ppm (n=7) | |||
| Colour Change | White → Orange | |||
| Reaction Principle | CHCl3 + I2O5 + H2S2O7 → Cl2 Cl2 + o-Tolidine → Orange products |
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| Coefficient of Variation | 15% (for 10 to 20 ppm), 10% (for 20 to 100 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Humidity correction is necessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Cl2, Br2, I2 | 1/20 time | + | Orange |
| Unsaturated halogenated HCs | 1/20 time | + | Orange |
| Saturated halogenated HCs | 1/10 time | + | Orange |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 10 ppm | - | - |
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