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磷化氫PH3氣體檢知管121SD PHOSPHINE 0.25-20.0ppm,比長(zhǎng)式氣體檢測(cè)管原理及使用方法,原理:CO、CO2、H2S、O2、SO2、NH3等檢測(cè)管的基本測(cè)定原理為線性比色法,即被測(cè)氣體通過(guò)檢測(cè)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(zhǎng)度與被測(cè)氣體的濃度成正比。本品應(yīng)避光保存于陰涼干燥處,嚴(yán)禁日光照射,保存溫度不超過(guò)40℃,玻璃制品,小心輕放。
更新時(shí)間:2024-11-20
在線留言磷化氫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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