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.