Movable float type level meter |
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| 申请号 | JP11248790 | 申请日 | 1990-04-27 | 公开(公告)号 | JPH049718A | 公开(公告)日 | 1992-01-14 |
| 申请人 | Mitsubishi Heavy Ind Ltd; Ryonichi Eng Co Ltd; | 发明人 | ONISHI TAKASHI; ITAYA TETSUYOSHI; HATAKEYAMA SHIGEYUKI; | ||||
| 摘要 | PURPOSE: To measure the liquid level with high accuracy and high stability by counting/measuring the distance from a reference point to a detecting point on the liquid surface by the number of pulses and outputting the number as a digital number while a float is moved up and down within a longitudinal cylinder of a liquid chamber. CONSTITUTION: As the liquid level 5 of a tank 17 is changed up and down, a float 4 is moved up and down. When the movement of the float 4 is to be measured, a pulse motor 11 is driven by the action of a limit switch 12a in response to a measurement instructing signal, and a magnetic sensor 8 is moved upward by the rotation of a screw rod 7 and generates a signal when it reaches the position of a permanent magnet 3 built in the float 4. The output of the magnetic sensor 8 is detected via an amplifier 14. At the same time, the liquid level 5 of the tank 17 is detected as a digital value showing the distance from a limit switch 12a below a reference point to the permanent magnet 3, namely, float 4 by counting the number of pulses of the pulse motor 11 since the lower limit switch 12a is started until the magnetic sensor 8 detects magnetism. Accordingly, the liquid level can be measured with high accuracy and high stability. COPYRIGHT: (C)1992,JPO&Japio |
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