硫化氫H2S氣體檢測(cè)管120SB HYDROGEN SULPHIDE 0.75-300ppm

Tube 20SB

1. PERFORMANCE
1） Measuring range ：3-150 ppm 1-50 ppm 0.75-37.5 ppm 6-300 ppm
Number of pump strokes 1（100ml） 3（300ml） 4（400ml） 1/2（50ml）
2） Sampling time ：1 minutes/1 pump stroke
3） Detectable limit ：0.3 ppm（300ml）
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→Dark 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（CH3CO2）2→PbS＋2CH3CO2H
4. CALIBRATION OF THE TUBE
PERMEATION TUBE METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
6 3
100ml
ppm
??
????
120SB HYDROGEN SULPHIDE
Substance Interference ppm Coexistence
Sulphur dioxide FIG.1 Tish neo at cacffuercatceyd .of readings 12 Higher readings are given.
Mercaptans FIG.2 〃550 〃
Nitrogen dioxide FIG.3 〃2 Lower readings are given.
（NOTE）
In case of 1 / 2, 2, 3 or 4 pump strokes, following formula is available for the actual concentration.
Actual concentration＝Reading value ×
0
60
80
20
Sulphur dioxide〔ppm〕?
FIG.1 Influence of Sulphur dioxide
Hydrogen sulphide indicating value 〔ppm〕
200 400
300ml
0
60
80
20
Ethyl mercaptan〔ppm〕?
FIG.2 Influence of Ethyl mercaptan
Hydrogen sulphide indicating value 〔ppm〕
200 400 600
300ml
0
100
150
50
Nitrogen dioxide〔ppm〕?
FIG.3 Influence of Nitrogen dioxide