Measurement of impure gases
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Everyone, the supplier provides us with a mixed gas consisting of 99% hydrogen and 1% nitrogen. Now it’s time to select a flow meter. Question: Which flow meter should be chosen to prevent the supplier from selling nitrogen to us at the price of hydrogen? Which parameters should be paid attention to? Thank you
Combination of volume measurement and component detection
1. Select a flow meter + analysis instrument 2. Mass flow meters can be used for a rough comparison, as they are capable of measuring density; when the pressure remains constant, a higher amount of nitrogen results in a higher density
To prevent suppliers from selling nitrogen to you at the price of hydrogen, it is best to install a gas analyzer.
This can only be used with a gas phase analyzer; LS said it’s necessary to consider the density, and the effect of that 1% nitrogen on 99% hydrogen can be ignored.
A flow meter is used to measure the flow rate of gases; it becomes complicated when trying to use it to distinguish between nitrogen and hydrogen
If the hourly flow rate is very constant, a thermal mass flow meter calibrated with the same mixture of gases can be used; if the flow rate varies significantly, it indicates that the gas composition has changed. If the flow rate is not fixed, the only option is to use a combination of a composition analyzer and a flow meter. For reference.
A flow meter is used to measure the flow rate of gases, and it seems difficult to use it to distinguish between nitrogen and hydrogen.