異戊二烯CH2=C（CH3）CH=CH2氣體檢測管190U ISOPRENE 1-16ppm

1. PERFORMANCE
1） Measuring range ：10-250 ppm
Number of pump strokes 3（300ml）
2） Sampling time ：4.5 minutes/3 pump strokes
3） Detectable limit ：1 ppm
4） Shelf life ：2 years
5） Operating temperature ：10～40℃
6） Temperature compensation ：Necessary（See "TEMPERATURE CORRECTION TABLE"）
7） Reading ：Graduations printed on the tube are calibrated by Ethyl cellosolve at 3 pump strokes
and Diacetone alcohol concentration is determined by using a conversion chart.
8） Colour change ：Yellow→Pale blue
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：5％　RSD-high：5％
3. CHEMICAL REACTION
Chromium oxide is reduced.
（CH3）2C（OH）CH2COCH3＋Cr6＋＋H2SO4→Cr3＋
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
200
150
500
400
300
100
50
20
5
300ml
ppm
（White）
DEHUMIDIFIER
Tube No.
DIACETONE ALCOHOL
Substance Interference Coexistence
Alcohols FIG.1 Similar stain is produced. Higher readings are given.
Halogenated hydrocarbons 〃
Aliphatic hydrocarbons Whole reagent is discoloured to It the top of Pale blue stain is clear,the
Pale brown. accuracy of readings is not affected.
Aromatic hydrocarbons 〃〃
Esters 〃〃
0
20
30
40
50
10
Ethanol〔ppm〕?
FIG.1 Influence of Ethanol
Diacetone indicating value 〔ppm〕
50 100
Coexistence
Interference
Diacetone alcohol（ppm）?
90U Tube reading（ppm）?
（300mR）?
5
20
50
100
200
300
400
500
10
50
100
150
200
250
TEMPERATURE CORRECTION TABLE
Conver. Corrected Concentration （ppm）
value 10℃ 15℃ 20℃ 25℃ 30℃ 35℃ 40℃
（ppm） （50°F） （59°F） （68°F） （77°F） （86°F） （95°F） （104°F）
250 － 380 250 170 130 90 70
200 440 300 200 140 100 80 60
150 330 210 150 110 80 60 50
100 200 130 100 80 60 40 30
50 80 60 50 40 30 20 16
30 50 40 30 23 18 12 8
10 16 14 10 8 6 4 3
190U C