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磷化氫PH3氣體檢知管121SD PHOSPHINE 0.25-20.0ppm，比長式氣體檢測管原理及使用方法，原理：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(fā)生有色反應(yīng)，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。本品應(yīng)避光保存于陰涼干燥處，嚴禁日光照射，保存溫度不超過40℃，玻璃制品，小心輕放。
更新時間：2026-04-13
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磷化氫PH3氣體檢知管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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