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Gastec 136LA Quick-measuring Detector tubes Methyl bromide CH3Br (1-36 ppm)

ManufacturerGastec(View more products from this manufacturer)
Model136LA
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Indicator: 2 to 18 ppm
Measuring Range:
+ 1 to 18 ppm, Number of Pump Strokes 2
+ 18 to 36 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute 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 1 to 6 ppm), 5% (for 6 to 18 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Catalog

Manual

manual tube

Performance
Measuring Range
1 to 18 ppm 18 to 36 ppm
Number of Pump Strokes
2 1
Correction Factor
1 2
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.2 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 1 to 6 ppm), 5% (for 6 to 18 ppm)
Shelf Life 2 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
Hologenes, NOx   + Yellow
Saturated halogenated hydrocarbons   + Yellow
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
n-Butyl Bromide 1.0 2 1 to 18 ppm
n-Butyl Bromide 2.4 1 2.4 to 43.2 ppm
n-Propyl Bromide 1.0 2 1 to 18 ppm
Chloro bromomethane 0.7 2 0.7 to 12.6 ppm
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
1 ppm (2014) - 10 to 15%

 

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