PURPOSE: To obtain moisture concn. known moisture reference gas with high accuracy by simple operation, by connecting a gas mixture bomb, a gas pressure regulating part and a hydrogen/oxygen gas reaction part while further providing a flow control part to the conduit of the inlet side or the outlet side of said hydrogen/oxygen gas reaction part.
CONSTITUTION: The gas mixture consisting of hydrogen, oxygen and nitrogen from a gas mixture bomb 1 is allowed to pass through a gas drying part (a glass drying column packed with a molecular sieve 3A) 2 to reduce the moisture concn. to 0.1ppm or less. Subsequently, gas pressure is controlled to constant pressure by a pressure regulating valve 3 and a manometer 4 while a flow amount is controlled by a flow amount control valve 5 and a flowmeter 6 and the dried gas is subsequently sent to and passed through a hydrogen/oxygen gas reaction tube 7 formed by packing a quartz glass tube with a platinum catalyst. At this time, the reaction tube 7 is heated to about 350°C by a heating oven 9 with a temp. regulator 8 provided therearound and, as a result, hydrogen gas and oxygen gas are reacted to form water while moisture reference gas is obtained.
INANAGA SHIYOUJI
MORITA YOUZOU
HIRAI KENJI
SHIMADZU CORP
| JPS55163428A | 1980-12-19 |