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乙炔中磷化氫PH3氣體檢知管121SB PHOSPHINE IN ACETYLENE 5-90ppm，CO、CO2、H2S、O2、SO2、NH3等檢測管的基本測定原理為線性比色法，即被測氣體通過檢測管與指示膠發生有色反應，形成變色層（變色柱），變色層的長度與被測氣體的濃度成正比。比長式氣體檢測管原理及使用方法，www.yd666.com
更新時間：2026-04-13
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乙炔中磷化氫PH3氣體檢知管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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