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首页>产品中心>日本光明北川式气体检测管>气体快速检测管>157SB溴代甲烷CH3Br气体检测管157SB METHYL BROMIDE 0.4-80ppm

溴代甲烷CH3Br气体检测管157SB METHYL BROMIDE 0.4-80ppm

简要描述:

溴代甲烷CH3Br气体检测管157SB METHYL BROMIDE 0.4-80ppm 溴甲烷CH3Br 英文名称 bromomethane;methyl bromide 又称溴代甲烷或甲基溴,甲基溴,又称溴代甲烷或甲基溴,, 溴甲烷CH3Br 英文名称 bromomethane;methyl bromide

更新时间:2018-03-27

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溴代甲烷CH3Br气体检测管157SB METHYL BROMIDE 0.4-80ppm

溴代甲烷CH3Br气体检测管157SB METHYL BROMIDE 0.4-80ppm

1. PERFORMANCE
1) Measuring range :5-80 ppm 2.5-40 ppm 0.9-7.3 ppm
Number of pump strokes 1(100ml) 2(200ml) 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 Methyl bromide indicating value 〔
ppm〕
100 200 300 400 500 600 700
20
10
TEMPERATURE CORRECTION TABLE
Scale True Concentration (ppm)
Readings 0℃ 5℃ 10℃ 20℃ 30℃ 40℃
(ppm) (32°F) (41°F) (50°F) (68°F) (86°F) (104°F)
80 - 140 98 80 75 73
60 145 76 67 60 57 56
40 44 43 42 40 40 40
30 30 30 30 30 30 30

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