Gastec 138 快速二氯甲烷测量探测管CH2Cl2(20~500ppm)

Indicator: 50 to 500 ppm
Measuring Range: 
+ 20 to 50 ppm, Number of Pump Strokes 2
+ 50 to 500 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, Cl2+ 3,3,5,5-Tetramethylbenzidine → Holoquinone
Coefficient of Variation: 15% (for 50 to 100 ppm), 10% (for 100 to 500 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
20 to 50 ppm 50 to 500 ppm
Number of Pump Strokes
2 1
Correction Factor
0.4 1
Sampling Time 3 minutes per pump stroke
Detecting Limit 10 ppm (n=2)
Colour Change White → Pale Pink
Reaction Principle CH2:Cl2 + CrO3 + H2S2O7 → Cl2
Cl2+ 3,3,5,5-Tetramethylbenzidine → Holoquinone
Coefficient of Variation 15% (for 50 to 100 ppm), 10% (for 100 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
Cl2, Br2, I2   + Pale pink
Unsaturated halogenated HCs   + Pale pink
Saturated halogenated HCs   + Pale pink
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Ethyl Chloride 0.3 1 15 to 150 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
50 ppm - 15.5 to 66.9%
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