| 摘要 |
PURPOSE:To surely close an opening and closing valve after the venting of air is completed even at a place different in atmospheric pressure or even in a case entering sterilization treatment continuously by closing the opening and closing valve upon the reception of a signal showing a temp. value stable in the temp. change rate at the time of an air venting process detected by a temp. detection sensor within a set time. CONSTITUTION:When the air in a chamber 7 is vented, a control apparatus 29 opens an opening and closing valve 27 to turn a heater 9 ON. Water temp. rising by turning the heater 9 ON is monitored by the first temp. detection sensor 13. This monitoring is continued until boiling temp. stabilizing a temp. value and this temp. value is detected on the basis of the temp. change rate of water temp. Next, the temp. in the chamber 7 is monitored by the second temp. sensor 15 and the temp. of steam is detected on the basis of the temp. change rate. Air is excluded from the chamber 7 through an opening and closing valve 25 by generated steam pressure and the chamber 7 becomes a state filled with saturated steam under atmospheric pressure. The steam saturated state is kept as it is for a relatively short time in order to make said state more perfect and, thereafter, the opening and closing valve 25 is closed to bring the chamber 7 to a perfect hermetically closed state. |
