How should trace moisture in gases be measured
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This post was last edited by fengxuemei on 2009-7-19 14:41. How should trace amounts of moisture in gases be determined? We used the gravimetric method, but the results were not satisfactory!
Why not try the most mature technology available today: online capacitive dew point meters? Laboratory mirrors ； Ultra-trace amounts are oscillated by laser.
The poster can use a KF-type micro moisture meter to measure the moisture content in gases. \"WS--2A Type Micro Moisture Analyzer User Manual\" http://bbs.hcbbs.com/viewthread.php?tid=236712&highlight=%2B%B2%D4%BA%A3%D2%BB%C1%A3%C9%B0
The micro-water content detectors produced by Zibo Sanpeng Kosen Instrument Co., Ltd. are quite good. Our company uses their devices for measuring micro-water content, and we purchased two units this time.
I have instruments for analyzing trace amounts of moisture, especially in corrosive gases. Please contact me if you need them or would like to discuss this further. This post was last edited by Canghai Yili Sha on 2009-3-1 at 11:39
1 Using a dew point meter 2 Moisture analyzer (equipped with a liquid hydrocarbon flash vaporization sampling injector)
Thank you to all the friends above; there are so many good methods after all. It’s just a pity that our company doesn’t have these instruments!
If it’s necessary, it is recommended to buy a portable model with a drying chamber. I can’t recommend any specific brands; for imported ones, a cost of a few ten thousand will suffice.
With the current financial crisis, companies are reluctant to make such purchases! Let’s wait until later!
Our company uses dew point meters: lol
It is quite convenient and reliable to measure moisture levels within 0.1% using a dew point meter. The above is determined using KF, with quantitative sampling via a sampler.
We use the dew point meter method, which is simple and fast
If it is not a corrosive gas, a capacitive portable dew point meter is the preferred choice, such as XPDM, SADP, GE PM880, etc.
The gravimetric method for trace moisture in gases should be able to provide accurate results; increasing the volume of gas taken as a sample would help. Pay attention to the impact of temperature, as gas sampling is carried out outdoors.
Water content at the ppm level is very difficult to measure using the gravimetric method!
This post was last edited by fengxuemei on 2009-6-3 at 17:56. There are many methods for dew point measurement, as well as numerous instruments available; a specific analysis should be conducted based on the operating conditions and particular circumstances. I specialize in measuring moisture content in gases; feel free to contact me via internal messaging if you have any questions.
Using a dew point meter or a Karl Fischer moisture analyzer
To measure water at the ppm level, the cold mirror dew point method is relatively accurate; the capacitance method can be used to determine the approximate range. However, sampling methods and the choice of tubing are also quite important when measuring moisture content. Generally, stainless steel needle valves should be used; the internal components should not be sealed with materials such as rubber, but rather with polytetrafluoroethylene. Pipes should also preferably be made of polytetrafluoroethylene, so that measurements can be taken quickly and accurately.
Trace water in gases should be measured using a dew point meter or a near-infrared analyzer
It depends on what kind of gas it is. Generally, to analyze moisture in liquids, a water analyzer is used; analyzing gases is more difficult because there are many factors that can affect the analysis results, such as sampling and sample introduction. If analysis is really necessary, a water analyzer produced by a factory in Yantai can be used. Its basic principle is similar to that of the one made by Zibo Sanpum Kesen, with the addition of a gas measurement device. We use their analyzer to determine the moisture content in dimethyl ether, and it works quite well. It’s just a bit expensive, at 120,000 yuan. It’s a small device, and it doesn’t seem to have very high technical complexity