| 摘要 |
PURPOSE:To always perform the measurement of moisture in high preciseness, by a method wherein a first and a second moisture removing passages are provided in parallel and, when the moisture absorbing capacity of the first moisture removing passage is lowered to a definite limit or less, the second moisture removing passage is used. CONSTITUTION:A specimen gas is introduced for a definite time from an introducing passage 10 to be passed through a first moisture removing passage 11 and sent to a moisture meter 15 while the moisture thereof is substantially removed. Subsequently, the specimen gas is introduced from an introducing passage 16 for a definite time and passed through a solenoid valve 17 to be sent to the moisture meter 15. The moisture content of the specimen gas is measured from the difference in two frequencies oscillated from the moisture meter 15. At appropriate time intervals, a second moisture removing passage 18 is used to send the specimen gas to the moisture meter 15 and, when the difference of the oscillation frequency in this case and the oscillation frequency obtained by using the second moisture removing passage 18 becomes high in a definite limit or more, the first moisture removing passage 11 is changed oer to the second moisture removing passage 18. During this time, the moisture removing capacity of the first moisture removing passage 11 is restored by a method such as replacing a moisture removing device 13. |
