MA-3 superb generation intelligent Karl Fischer moisture analyzer for measuring moisture content in gas
1. Measurement method: Karl Fischer Coulomb method.
2. Experimental sequence:
a. The instrument (MA-3 super-class intelligent Karl Fischer moisture analyzer) produced by Shanghai Benang Scientific Instrument Co., Ltd. is adjusted to the normal state. Connect the required piping.
b. Weigh the gas sampler (with sample air bags or cylinders)
c. The sampler is connected to the pipeline. After the instrument enters the measurement state, the gas sample is introduced into the Karl Fischer reagent in the electrolytic flask to determine the moisture content.
d. Weigh the gas injector again
Calculate the moisture content of the sample. Calculated as follows:
Where: w - the mass fraction of water, ie moisture content
m - the quality of water, in grams
M1——the mass of the gas sampler before injection, in grams
M2——the mass of the gas sampler after injection, in grams
The arithmetic mean of the results of two parallel determinations is the measurement result, and the difference between the results of the two parallel determinations shall not be greater than 20%.
3. Test equipment:
(1) MA-3 type super-class intelligent Karl Fischer moisture analyzer (Karl Freugh Coulometric moisture analyzer).
(2) Electronic balance: one ten thousandth of precision.
(3) Gas sampling bag (2L) or glass sampling bottle (specific models can be selected according to needs, but if glass sampling bottles are used, the weighing requirements for electronic balances may need to be changed accordingly, because the quality of such sampling bottles is larger. ).
4. Things to note:
(1) Measure according to relevant national standards, such as the measurement process must be carried out in a ventilated kitchen.
(2) This method is adopted for the case where the moisture content of the gas is small (in ppm). If the moisture content is large, it can be changed to a simpler volume injection method, and the moisture content of the sample is calculated by the molar volume of the gas. However, it is necessary to pay attention to the expansion rate of the gas at different temperatures.
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