硫化氫H2S氣體檢知管120SD HYDROGEN SULPHIDE 1-60ppm

1. PERFORMANCE
1） Measuring range ：2-60 ppm 1-30 ppm
Number of pump strokes 1/2（50ml） 1（100ml）
2） Sampling time ：1 minute/1 pump stroke
3） Detectable limit ：0.2 ppm（100ml）
4） Shelf life ：3 years
5） Operating temperature ：0～40℃
6） Reading ：Direct reading from the scale calibrated by 1 pump stroke
7） Colour change ：White→Pale brown
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：5％　RSD-high：5％
3. CHEMICAL REACTION
By reacting with Lead acetate（II）, Lead sulphide is produced.
H2S＋Pb（CH3COO）2→PbS＋2CH3COOH
4. CALIBRATION OF THE TUBE
PERMEATION TUBE METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
135
10
15
20
25
30
100ml
ppm
????
Tube No.
120SD HYDROGEN SULPHIDE
（NOTE）
In case of 1 /2 pump strokes, following formula is available for the actual concentration.
Actual concentration＝2×Reading value
Substance Interference ppm Coexistence
Sulphur dioxide FIG.1 aTfhfeec atecdc.uracy of readings is not 10 Higher readings are given.
Mercaptans FIG.2 〃300 〃
Nitrogen dioxide FIG.3 〃2 Lower readings are given.
0
60
80
20
40
Sulphur dioxide〔ppm〕?
FIG.1 Influence of Sulphur dioxide
Hydrogen sulphide indicating value 〔ppm〕
200 400
100ml
0
60
80
20
40
Ethyl mercaptan〔ppm〕?
FIG.2 Influence of Ethyl mercaptan
Hydrogen sulphide indicating value 〔ppm〕
200 400 600
100ml
0
150
50
100
Nitrogen dioxide〔ppm〕?
FIG.3 Influence of Nitrogen dioxide