環氧乙烷CH3CHCH2O氣體檢測管122SC ETHYLENE OXIDE 3-70ppm

Tube 22SC

1. PERFORMANCE
1） Measuring range ：1-15 ppm
Number of pump strokes ：3（300ml）
2） Sampling time ：4.5 minutes/3 pump strokes
3） Detectable limit ：0.5 ppm
4） Shelf life ：3 years
5） Operating temperature ：10～40℃
6） Temperature compensation ：Necessary（See "TEMPERATURE CORRECTION TABLE"）
7） Reading ：Direct reading from the scale calibrated by 3 pump strokes
8） Colour change ：Pale pink→Yellow
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.： 5％　RSD-high：5％
3. CHEMICAL REACTION
By decomposing with an Oxidizer, Formic acid is produced and PH indicator is discoloured.
CH2CH2O＋H2SO4→HOCH2CH2OH
HOCH2CH2OH＋HIO4→2HCHO＋HIO3＋H2
HCHO＋HIO4＋H2SO4→HCOOH＋HIO3
HCOOH＋NaOH→Na（HCOO）＋O2
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
????
????
????
????
????
????
????
GAS ???? To pump
DETECTOR TUBE
（White）
PRETREAT TUBE
15
10
5
1
ppm
300
ml
122SC ETHYLENE OXIDE
Substance Interference Coexistence
Aldehydes FIG.2 Similar stain is produced. Higher readings are given.
Sulphur dioxide Pale yellow stain is produced. 〃
Hydrogen sulphide FIG.1 〃〃
0
20
10
Hydrogen sulphide〔ppm〕?
FIG.1 Influence of Hydrogen sulphide
Ethylene oxide indicating value 〔ppm〕
1 2
Coexistence
Interference
0
20
10
Formaldehyde〔ppm〕?
FIG.2 Influence of Formaldehyde
Ethylene oxide indicating value 〔ppm〕
10 20
Coexistence
Interference
TEMPERATURE CORRECTION TABLE
Scale True Concentration （ppm）
Readings 10℃ 15-25℃ 30℃ 40℃
（ppm） （50°F） （59°F） （86°F） （77°F）
15 19 15 13 10
10 12.5 10 8.5 7
5 6 5 4 3.5
1 1 1 1 1