單乙醇胺H2NCH2CH2OH氣體檢測管224SA MONOETHANOL AMINE 0.5-50ppm

Tube No.224SA

1. PERFORMANCE
1） Measuring range ：1-50 ppm 0.5-25 ppm
Number of pump strokes 1（100ml） 2（200ml）
2） Sampling time ：1 minute/1 pump stroke
3） Detectable limit ：0.2 ppm（200ml）
4） Shelf life ：2 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 ：Pink→Pale purple
2. RELATIVE STANDARD DEVIATION
3. CHEMICAL REACTION
By reacting with Sulphuric acid, PH indicator is discoloured.
H2NCH2CH2OH＋H2SO4→（HOC2N5NH3）2SO4
4. CALIBRATION OF THE TUBE
COLOURIMETRY METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
1
3
5
10
15
20
25
30
40
50
ppm
GAS To pump
224SA MONOETHANOL AMINE
Substance Interference Coexistence
Other amines Brownish yellow stain is produced. Double-stain layer（Brownish yellow
FIG.1 and Pale purple）is produced.
ammonia Similar stain is produced. Double-stain layer（Yellow and Pale
FIG.2 purple）is produced.
Hydrazine 〃〃
（ACtmOo2s＋phHe2rOic） air 〃
0
40
20
Methyl amine〔ppm〕?
FIG.1 Influence of Methyl amine
Monoethanol amine
indicating value 〔ppm〕
20 40
Coexistence
Interference
0
40
20
Ammonia〔ppm〕?
FIG.2 Influence of Ammonia
Monoethanol amine
indicating value 〔ppm〕
5 10
Coexistence
Interference
（NOTE）
1）In case of 2 pump strokes, following formula is available for the actual concentration.
Actual concentration＝1/2×Temperature corrected value
2）In any case, Pale purple stain only is indicated concentration of Monoethanal amine. Other discolourations
may be disregarded.
TEMPERATURE CORRECTION TABLE
Scale True Concentration （ppm）
Readings 0℃ 10℃ 20℃ 30℃ 40℃
（ppm） （32°F） （50°F） （68°F） （86°F） （104°F）
50 － － 50 35 29
40 － 65 40 30 25
30 － 49 30 23 20
25 － 39 25 20 17
20 65 30 20 16 14
15 45 22 15 12 10
10 29 14 10 8 7
5 12 7 5 4 3
3 6 4 3 3 2
1 1 1 1 1 1