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甲基溴检测管136L Methyl bromideCH3Br
Methylbromide No.136L
CH3Br
Performance |
MeasuringRange | 2.5 to 10 ppm | 10 to 100 ppm | 100 to 200 ppm |
Number of Pump Strokes | 4 | 1 | 1/2 |
CorrectionFactor | 1/4 | 1 | 2 |
SamplingTime | 3 minutes per pumpstroke | ||
DetectingLimit | 0.5 ppm (n=4) | ||
ColorChange | White → Yellow | ||
ReactionPrinciple | 2CH3Br +I2O5+ H2S2O7 → Br 2 | ||
Coefficient ofVariation | 10% (for10 to 20 ppm), 5% (for 20 to 100 ppm) | ||
ShelfLife | 2Years | ||
Corrections for temperature & humidity | Unnecessary | ||
Store the tubes at cool and darkplace. |
Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Chlorine, Bromine,NOx | - | Plus error | Produce yellowstain |
Saturatedhalogenated hydrocarbons | - | Plus error | Produce yellowstain |
Othersubstance measurable with this detector tube |
Substance | Correction Factor | Pump Strokes | Measuring Range |
Chlorobromomethane | 0.9 | 1 | 9 to 90 ppm |
1,1-Dibromoethane | 0.7 | 1 | 7 to 70 ppm |
1,2-Dibromoethane | 0.8 | 1 | 8 to 80 ppm |
Dibromomethane | 0.5 | 1 | 5 to 50 ppm |
Ethyl Bromide | 1.0 | 1/2, 1, 4 | 2.5 to 200 ppm |
n-ButylBromide | 1.0 | 1 | 1 to 100ppm |
Benzyl bromide
Tube 136L Reading(n=1) | 10 | 20 | 40 | 60 | 80 | 100 |
Benzyl Bromide Conc.(ppm) | 25 | 75 | 180 | 350 | 580 | 850 |
Bromform
Tube 136L Reading(n=1) | 10 | 20 | 40 | 60 | 80 | 100 |
Bromform Conc.(ppm) | 1 | 4 | 12 | 24 | 37 | 50 |
Calibration gasgeneration | Diffusion tubemethod |
TLV-TWA | TLV-STEL | Explosive range |
1 ppm | - | 10 to 15% |