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磷化氢PH3气体检知管121SD PHOSPHINE 0.25-20.0ppm，比长式气体检测管原理及使用方法，原理：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。本品应避光保存于阴凉干燥处，严禁日光照射，保存温度不超过40℃，玻璃制品，小心轻放。
更新时间：2024-04-24
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磷化氢PH3气体检知管121SD PHOSPHINE 0.25-20.0ppm
Tube 21SD
1. PERFORMANCE
1） Measuring range ：0.5-10.0 ppm 0.25-0.5 ppm 1-20 ppm
Number of pump strokes 1（100ml） 2（200ml） 1/2（50ml）
2） Sampling time ：1 minute/1 pump stroke
3） Detectable limit ：0.1 ppm（200ml）
4） Shelf life ：1 year
5） Operating temperature ：0～40℃
6） Reading ：Direct reading from the scale calibrated by 1 pump stroke
7） Colour change ：Pale orange→Brownish purple
2. RELATIVE STANDARD DEVIATION
RSD-low：15％ RSD-mid.：10％ RSD-high：5％
3. CHEMICAL REACTION
By reacting with Mercuric chloride（II）, Hydrogen chloride is produced and PH indicator is discoloured.
PH3＋3HgCI2→P（HgCI）3＋3HCI
4. CALIBRATION OF THE TUBE
STANDARD GAS CYLINDER METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
8.0
10.0
6.0
4.0
2.0
1.0
0.5
ppm
100ml
GAS To pump
121SD PHOSPHINE
（NOTE）
1）When the concentration is below 0.5ppm, 2 pump strokes can be used to determine the
lower concentration. Following formula is available for the actual concentration.
Actual concentration＝1/2×Reading value
In case of 1/2 pump strokes, following formula is available for actual concentration.
Actual＝2×Reading value
2） Read the concentration rapidly because the discoloured layer will be faded gradually.
Substance Interference ppm Coexistence
Ammonia 60 From gas inlet side of discoloured
layer, the discolouration is faded.
Hydrogen selenide Similar stain is produced. Higher readings are given.
Nickel carbonyl 〃〃
Arsine 〃〃
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