| 摘要 |
A method for providing a real time measurement of the purity of one gas in a binary mixture of two known gases applies principles of the fan laws and ideal gas laws in a manner whereby the volume percent purity of the gas may be calculated directly from measured fan differential pressure. The calculated purity is preferably corrected for variations in temperature and pressure. The method requires the determination and use of an appropriate fan constant based on the gas whose purity is to be measured and specific to the fan being used to circulate the gas mixture and the speed at which it operates. An appropriate adjustment factor for differences between design and measured speed may also be applied in accordance with the fan laws. The method can provide real time measurement of hydrogen gas purity in the cooling gas circulated inside a large synchronous AC generator and utilizing a microprocessor to provide a real time output of hydrogen gas purity.
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