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Patented phosphoric acid (P2O5) electrolysis method to measure the moisture content, the use of phosphoric acid electrolysis method to use the characteristics of phosphoric acid, when the gas containing water through the quartz tube, attached to the phosphate absorption of gas in the platinum wire, water electrolysis, will change the electrical resistance of platinum wire, flow through the current is also changed. According to Faraday's law, the current is proportional to the water in the carrier gas. Therefore, in the case of the flow rate of the carrier gas, the content of water in the carrier gas can be measured by measuring current.