N,N-二甲基乙酰胺（CH3）2NCOCH3氣體檢測管229S 5-70ppm

1. PERFORMANCE
1） Measuring range ：5-70 ppm
Number of pump strokes 2（200ml）
2） Sampling time ：2 minutes/1 pump stroke
3） Detectable limit ：1 ppm
4） Shelf life ：1 year
5） Operating temperature ：10～40℃
6） Temperature compensation ：Necessary under 20℃（See "TEMPERATURE CORRECTION TABLE"）
7） Reading ：Direct reading from the scale calibrated by 2 pump strokes
8） Colour change ：Pale purple→Pale yellow
2. RELATIVE STANDARD DEVIATION
RSD-low：15％　RSD-mid.：15％　RSD-high：15％
3. CHEMICAL REACTION
By reacting with Alkali, Dimethyl amine is produced. Dimethyl amine reacts on Phosphoric acid and
PH indicator is discoloured.
CH3CON（CH3）2→HN（CH3）2
2HN（CH3）2＋H3PO4→〔（CH3）2NH2〕2HPO4
4. CALIBRATION OF THE TUBE
DIFFUSION TUBE METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
70
60
50
40
30
20
10
5
100ml
ppm
????
Tube No.
229S N, N-DIMETHYL ACETAMIDE
TEMPERATURE CORRECTION TABLE
Scale True Concentration （ppm）
Readings 10℃ 15℃ 20-40℃
（ppm） （50°F） （59°F） （68-104°F）
70 120 84 70
60 102 70 60
50 85 60 50
40 67 47 40
30 50 36 30
20 35 23 20
10 17 12 10
5 10 6 5
Substance Interference Coexistence
Carbon dioxide Not affected. 0.17％ Lower readings are given.
Ammonia Similar stain is produced. Higher readings are given.
Amines 〃〃
Hydrazine 〃〃