Gastec 138L Quick-measuring Detector tubes Methylene chloride CH2Cl2 (4~150ppm)
ManufacturerGastec(View more products from this manufacturer)
Model138L
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Indicator: 10 to 60 ppm
Measuring Range:
+ 4 to 10 ppm, Number of Pump Strokes 4
+ 10 to 60 ppm, Number of Pump Strokes 2
+ 60 to 150 ppm, Number of Pump Strokes 1
Sampling Time: 3 minute per pump stroke
Colour Change: White → Pale Pink
Reaction Principle: CH2:Cl2 + CrO3 + H2S2O7 → Cl2
Coefficient of Variation: 15% (for 10 to 20 ppm), 10% (for 20 to 60 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 | 3 minutes per pump stroke | |||
| Detecting Limit | 5 ppm (n=2) | |||
| Colour Change | White → Pale Pink | |||
| Reaction Principle | CH2:Cl2 + CrO3 + H2S2O7 → Cl2 Cl2+ 3,3,5,5-Tetramethylbenzidine → Holoquinone |
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| Coefficient of Variation | 15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm) | |||
| Shelf Life | 2 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 |
| Cl2, Br2, I2 | + | Pale pink | |
| Unsaturated halogenated HCs | 6 ppm | + | Pale pink |
| Saturated halogenated HCs | 3 ppm | + | Pale pink |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 50 ppm | - | 15.5 to 66.9% |
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