Gastec 136H 快速甲基溴检测管CH3Br(10~600ppm)

Indicator: 20 to 300 ppm
Measuring Range: 
+ 10 to 20 ppm, Number of Pump Strokes 2
+ 20 to 300 ppm, Number of Pump Strokes 1
+ 300 to 600 ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minutes per pump stroke
Colour Change: White → Yellow
Reaction Principle: 2CH3Br +I2O5+ H2S2O7 → Br 2, Br 2 +O-Tolidine → Yellow product
Coefficient of Variation: 10% (for 20 to 100 ppm), 5% (for 100 to 300 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
10 to 20 ppm 20 to 300 ppm 300 to 600 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 4 ppm (n=2)
Colour Change White → Yellow
Reaction Principle 2CH3Br +I2O5+ H2S2O7 → Br 2
Br 2 +O-Tolidine → Yellow product
Coefficient of Variation 10% (for 20 to 100 ppm), 5% (for 100 to 300 ppm)
Shelf Life 3 Years
Corrections for temperature & humidity Unnecessary
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, NOx   + Yellow
Saturated halogenated HCs   + Yellow
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Chlorobromomethane 0.9 1 18 to 270 ppm
1,2-Dibromoethane 0.7 1 14 to 210 ppm
n-Butyl Bromide 1.2 1 24 to 360 ppm
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
1 ppm - 10 to 15%
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