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甲醇CH3OH气体检测管119SA METHYL ALCOHOL(METHANOL) 0.05-6.0%
Tube 19SA
1. PERFORMANCE
1) Measuring range :0.05-6.0%
Number of pump strokes 1(100ml)
2) Sampling time :1.5 minutes/1 pump stroke
3) Detectable limit :100 ppm
4) Shelf life :3 years
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 :Yellow orange→Pale green
2. RELATIVE STANDARD DEVIATION
RSD-low:10% RSD-mid.:5% RSD-high:5%
3. CHEMICAL REACTION
Potassium dichromate is reduced
CH3OH+Cr6++H2SO4→Cr3+
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
0.05
0.1
0.5
1.0
2.0
3.0
4.0
5.0
6.0
%
GAS To pump
DEHUMIDIFIER
(White)
119SA
METHYL ALCOHOL
(METHANOL)
Substance Interference ppm Coexistence
Paraffin (morefi nth haynd Cro3c)arbons FIG.1 Similar stain is produced. Higher readings are given.
Alcohols FIG.2 〃〃
Esters 〃50 〃
Ketones 〃〃
Aromatic hydrocarbons 〃〃
Reagent is discoloured to If the top of the discolouration can
Halogenated hydrocarbons Brown slightly. ibneg so bist aninoet da,fftehcet eadc.curacy of read-
(NOTE)
Although the top of light green stain changes to Brown gradually, read the concentration on the top of the light
green stain shortly.
0
5
6
3
4
Hexane〔%〕�
FIG.1 Influence of Hexane
Methanol indicating value 〔%〕
0.1 0.2 0.3
2
1
0
5
6
3
4
Ethanol〔%〕�
FIG.2 Influence of Ethanol
Methanol indicating value 〔%〕
0.1 0.2 0.3 0.4 0.5
2
1
Coexistence
Interference
TEMPERATURE CORRECTION TABLE
Scale True Concentration (%)
Readings 0℃ 10℃ 20℃ 30℃ 40℃
(%) (32°F) (50°F) (68°F) (86°F) (104°F)
6.0 6.0 4.3 3.3
5.0 5.0 3.7 2.8
4.0 4.0 3.0 2.3
3.0 5.1 3.0 2.3 1.8
2.0 3.0 2.0 1.6 1.2
1.0 2.7 1.4 1.0 0.8 0.6
0.5 1.0 0.7 0.5 0.4 0.3
0.1 0.1 0.1 0.1 0.1 0.1
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