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四氯化碳检测管134Carbon tetrachloride Carbon tetrachloride No.134
CCl4
| Performance |
MeasuringRange | 0.5 to 2.5 ppm | 2.5 to 60 ppm |
Number of Pump Strokes | 2 to 5 | 1 |
Correction Factor | 1/2 to 1/5 | 1 |
SamplingTime | 1.5 minutes per pumpstroke | |
DetectingLimit | 0.2 ppm (n=5) | |
ColorChange | White → Yellow | |
ReactionPrinciple | CCl4 + I2O5 + H2S2O7 → COCl2 | |
| Coefficient ofVariation | 15% (for 2.5 to 20ppm), 10% (for 20 to 60 ppm) | |
| ShelfLife | 1Years | |
| Correctionsfor temperature & humidity | Unnecessary | |
| Store the tubes in the refrigerator to keep at 10oC(50oF) or below. | ||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Hydrogen chloride | 100ppm | Plus error | Produce yellowstain |
Chlorine, Bromine | 50ppm | Plus error | Produce yellowstain |
Vinyl chloride, | - | None | Nodiscoloration |
Chloroform | - | None | Nodiscoloration |
Methyl bromide | 100ppm | Plus error | Produce yellowstain |
Tetrachloroethylene | - | None | Nodiscoloration |
Methyl chloroform | 100ppm | Plus error | Produce yellowstain |
Trichloroethylene | - | None | Nodiscoloration |
| Othersubstance measurable with this detector tube |
Substance | Correction Factor | Pump Strokes | Measuring Range |
Chloropicrin | 1.0 | 1 | 25 to 60% |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| 5ppm | 10ppm | - |