硫化氫H2S氣體測(cè)毒管120SE HYDROGEN SULPHIDE 0.5-40ppm

1. PERFORMANCE
1） Measuring range ：2-40 ppm 1-20 ppm 0.5-10 ppm
Number of pump strokes 1/2（50ml） 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） Reading ：Direct reading from the scale calibrated by 1 pump stroke
7） Colour change ：Yellow→Pink
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：5％　RSD-high：5％
3. CHEMICAL REACTION
By reacting with mercuric chloride, Hydrogen chloride is produced and PH indicator is discoloured.
H2S＋HgCI2→HgS＋2HCI
4. CALIBRATION OF THE TUBE
PERMEATION TUBE METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
20
15
10
5
1
100ml
ppm
（White）
DEHUMIDIFIER

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Tube No.
120SE HYDROGEN SULPHIDE
Substance Interference Coexistence
Phosphine Similar stain is produced. Higher readings are given.
Mercaptans 〃〃
Nitrogen dioxide Not affected. Lower readings are given.
Ammonia 〃〃
Arsine Higher readings are given.
Hydrogen selenide 〃
Hydrogen cyanide 〃
Sulphur dioxide If possible to read, not affected.
（NOTE）
In case of 1 / 2 and 2 pump strokes, the following equation is available for the actual concentration.
1/2 pump stroke：Actual concentration＝Reading value×2
2 pump strokes：Actual concentration＝Reading value÷2
Coexistence
Interference
0
Methyl mercaptan〔ppm〕?
FIG.1 Influence of Methyl mercaptan
H2S indicating value 〔ppm〕
4
4
2
2
Coexistence
Interference
0
Phosphine〔ppm〕?
FIG.2 Influence of Phosphine