Methylene Chloride Detection Tubes (4 to 150 ppm)
Gastec Detection Tube No. 138L measures Methylene Chloride with a Range of 4 to 150 ppm.
- Measuring Range:
- 4 to 10 ppm
- 10 to 60 ppm
- 60 to 150 ppm
- Number of Pump Strokes: 4, 2, 1
- Correction Factor: 0.4, 1, 2.5
- Sampling Time: 3 minutes per pump stroke
- Detecting Limit: 3 ppm (4 pump strokes)
- Changes from White to Pale Pink
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle:
- CH2Cl2 + CrO3 + H2S2O7 → Cl2
- Cl2 + 3,3',5,5'-Tetramethylbenzidine → Pale pink product
- Relative Standard Deviation: 15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm)
- 2 Year Shelf Life
- Store the tubes at cool and dark place.
- Comes in a Box of 5 pre tubes and 5 detector tubes
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Chlorine, Bromine, Iodine |
|
+ |
Pale pink |
| Unsaturated halogenated HCs |
≧ 6 ppm |
+ |
Pale pink |
| Saturated halogednated HCs |
≧ 3 ppm |
+ |
Pale pink |
Methylene Chloride Detection Tubes (4 to 150 ppm)
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