| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a monitoring system for a liquid pressure feeding device, which can reduce power consumption. <P>SOLUTION: In a liquid pressure feeding device 24, a sealed container includes a gas supply port 6 and a gas discharge port 7 for a working gas and an inlet 8 and a pressure feeding port 9 for a pressure feeding liquid, a float 3 is provided in the sealed container, and when the float reaches a predetermined high level, the gas supply port 6 is opened and the gas discharge port 7 is closed, and when the float 3 reaches a predetermined low level, the gas supply port 6 is closed and the gas discharge port 7 is opened. The liquid pressure feeding device 24 includes an operation detector 34 for detecting vibrations, sounds or ultrasonic waves caused by the operation of the liquid pressure feeding device 24, and a switch 33 which is turned ON when the float 3 rises to a second predetermined high level which is a little lower than the predetermined high level and is turned OFF when the float reaches a level lower than the second predetermined high level. The power supply of the operation detector 34 is turned ON by the ON operation of the switch 33 and the power supply of the operation detector 34 is turned OFF after a predetermined time period after the ON operation of the switch 33 or after a second predetermined time period after the OFF operation of the switch 33. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
