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乙炔中磷化氢PH3气体检知管121SB PHOSPHINE IN ACETYLENE 5-90ppm，CO、CO2、H2S、O2、SO2、NH3等检测管的基本测定原理为线性比色法，即被测气体通过检测管与指示胶发生有色反应，形成变色层（变色柱），变色层的长度与被测气体的浓度成正比。比长式气体检测管原理及使用方法，www.yd666.com
更新时间：2024-04-17
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乙炔中磷化氢PH3气体检知管121SB PHOSPHINE IN ACETYLENE 5-90ppm
Tube 21SB
1. PERFORMANCE
1） Measuring range ：5-90 ppm
Number of pump strokes 1（100ml）
2） Sampling time ：3 minutes/1 pump stroke with orifice
3） Detectable limit ：1 ppm
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 ：Pale blue→Yellowish brown
2. RELATIVE STANDARD DEVIATION
RSD-low：10％ RSD-mid.：10％ RSD-high：5％
3. CHEMICAL REACTION
By reacting with Mercuric chloride（II）and Cupric sulphate（II）, Mercuric phosphorus chloride and Cupric
phosphate are produced respectively.
Moreover, Cupric phosphide reacts with Acetylene and Copper acetylene is produced.
PH3＋HgCI2＋H2O→Hg3P2・3HgCI・3H2O
PH3＋CuSO4→Cu3P2＋H2O
Cu3P2＋HC≡CH→CuC≡CCu
4. CALIBRATION OF THE TUBE
COLOURIMETRY METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
90
80
70
60
50
40
30
20
10
5
ppm
100ml
GAS To pump
121SB PHOSPHINE IN ACETYLENE
Substance Interference ppm Coexistence
Hydrogen sulphide Black stain is produced. 10 Higher readings are given.
Arsine Dim yellow stain is produced. 10 〃
Washer
Connector
holder
Rubber tube
connector
Flow Control Orifice
INDICATOR
6.NOTE
1）In case that Acetylene does not exist, lower readings are given.
2）A flow control orifice（an extra option）is required to attach as shown in the following drawing.
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