N,N-二甲基甲酰胺（CH3）2NCHO氣體檢測管 196S N,N-DIMETHYL FORMAMIDE 1-30ppm

1. PERFORMANCE
1） Measuring range ：2-30 ppm 1-5 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 ：10～40℃
6） Temperature compensation ：Necessary（0～20℃）（See "TEMPERATURE CORRECTION TABLE"）
7） Reading ：Direct reading from the scale calibrated by 1 pump stroke
8） Colour change ：Pale purple→Pale yellow
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：5％　RSD-high：5％
3. CHEMICAL REACTION
By reacting with alkali, Amine is produced. Further, PH indicator is discoloured by reacting together with
phosphoric acid.
HCON（CH3）2＋NaOH→HN（CH3）2
HN（CH3）2＋H3PO4→〔（CH3）2NH2〕2HPO4
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
30
25
20
15
10
5
2
100ml
ppm
????
Tube No.
196S N, N-DIMETHYL FORMAMIDE
（NOTE）
When the concectration is below 5 ppm, 2 pump strokes can be used to determine the lower concentration.
Following formula is available for the actual concentration.
Actual concentration＝1/2×Temperature corrected value
Substance Interference ppm Coexistence
Sulphur dioxide FIG.1 Tafhfeec atecdc.uracy of readings is not 200 Lower readings are given.
Carbon dioxide FIG.2 〃0.1％ 〃
Ammonia Similar stain is produced. Higher readings are given.
Amines 〃〃〃
Hydrazine 〃〃〃
0
15
20
10
5
Sulphur dioxide〔ppm〕?
FIG.1 Influence of Sulphur dioxide
N,N-Dimethyl fomamide
indicating value 〔ppm〕
100 200 300 400 0
15
20
10
5
Carbon dioxide〔％〕?
FIG.2 Influence of Carbon dioxide