溴甲烷CH2Br2氣體檢測管157SB METHYL BROMIDE 2.5-40ppm

1. PERFORMANCE
1） Measuring range ：5-80 ppm 2.5-40 ppm 0.9-7.3 ppm
Number of pump strokes 1（100ml） 2（200mr） 4（400ml）
2） Sampling time ：1.5 minutes/1 pump stroke
3） Detectable limit ：1 ppm（200ml）
4） Shelf life ：3 years（Necessary to store in a refrigerated place ; 0～10℃）
5） Operating temperature ：0～40℃
6） Temperature compensation ：Necessary（See "TEMPERATURE CORRECTION TABLE"）
7） Reading ：Direct reading from the scale calibrated by 1 pump stroke
8） Colour change ：White→Yellow
2. RELATIVE STANDARD DEVIATION
RSD-low：15％　RSD-mid.：10％　RSD-high：10％
3. CHEMICAL REACTION
By decomposing with an Oxidizer, Bromine is produced. Bromine reacts with o-Toluidine and yellow
Orthoquinone is produced.
CH3Br＋I2O5＋CrO3＋H2SO4→Br2
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
5
10
15
20
30
40
60
80
ppm
100ml
GAS To pump
（Olive） （White）
PRETREAT TUBE DETECTOR TUBE
Tube No.
157SB METHYL BROMIDE
（NOTE）
When the concentration is below 5 ppm, 2 pump strokes can be used to determine the lower concentration.
Following formula is available for the actual concentration.
Actual concentration＝1/2×Temperature corrected value
Substance Interference ppm Coexistence
Halogen Similar stain is produced. Higher readings are given.
Halogenated hydrocarbons 〃〃
Hexane FIG.1 200 Lower readings are given.
0
50
60
70
80
30
40
Hexane〔ppm〕?
FIG.1 Influence of Hexane