1,2,4-*基苯C6H3（CH3）3气体检测管111U 1,2,4-TRIMETHYL BENZENE 20-250ppm

Tube 11U
1. PERFORMANCE
1） Measuring range ：10-250 ppm
Number of pump strokes 1（100ml）
2） Sampling time ：1.5 minutes/1 pump stroke
3） Detectable limit ：1 ppm
4） Shelf life ：2 years
5） Operating temperature ：0～40℃
6） Reading ：Graduations printed on the tube are calibrated by Ethyl acetate at 1 pump stroke
and 1,2,4-trimethyl benzene is determined by using a conversion chart.
7） Colour change ：Yellow→Dark brown
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：5％　RSD-high：5％
3. CHEMICAL REACTION
Chromium oxide is reduced.
C6H3（CH3）3＋Cr6＋＋H2SO4→Cr3＋
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
DEHUMIDIFIER
（White）
250
200
150
100
50
30
10
ppm
111U C 1,2,4-TRIMETHYL BENZENE
Substance Interference Coexistence
Alcohols Brown stain is produced. Higher readings are given.
Esters 〃〃
Ketones 〃〃
Aromatic hydrocarbons 〃〃
Aliphatic hydrocarbons Double-layer stain is produced. If the
（more than C3） dcaanrk b ber oowbnta sintaeidn bisy citl.ear, the readings
Halogenated hydrocarbons 〃
No. 111U Tube reading（ppm）�
（100ml）�
Trimethyl benzene（ppm）�
1000
800
600
400
200
100
50
20
20
150
200
50
100
25