1,1,1-Trichloroethane |
NO.135 |
| CH3CCl3 |  |
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Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 3 minutes per pump stroke | ||
| Detecting Limit | 50 ppm (n=1) | ||
| Colour Change | White → Reddish orange | ||
| Reaction Principle | 1,1,1-Trichloroethane reacts with oxidizing agent to produce intermediate products then it react with detecting agent to produce reddish orange stain. | ||
| Coefficient of Variation | 10% (for 100 to 200 ppm), 5% (for 200 to 500 ppm) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Temperature 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 |
| Chlorine, Bromine, Iodine | + | Reddish orange | |
| Chloroform, Dichloromethane | + | Reddish orange | |
| Carbon tetrachroride | No | No | |
| Methyl bromide | + | Reddish orange | |
| Trichloroethylene, Tetrachloroethylene | + | Reddish orange |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Chlorobromomethane | Factor: 0.22 | 1 | 22 to 110 ppm |
| 1,1-Dichloroethane | Factor: 0.9 | 1 | 90 to 4500 ppm |
| 1,2-Dichloroethane | Factor: 4.0 | 1 | 400 to 2000 ppm |
| 1,1,2-Trichloroethane | Tube 135 Reading (n=2) | 100 | 200 | 300 | 400 | 500 |
| 1,1,2-Trichloroethane (ppm) | 220 | 350 | 480 | 610 | 750 |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 350 ppm | 450 ppm | - |
