JPS55110917A - Detecting device for liquid condition - Google Patents
Detecting device for liquid conditionInfo
- Publication number
- JPS55110917A JPS55110917A JP1786079A JP1786079A JPS55110917A JP S55110917 A JPS55110917 A JP S55110917A JP 1786079 A JP1786079 A JP 1786079A JP 1786079 A JP1786079 A JP 1786079A JP S55110917 A JPS55110917 A JP S55110917A
- Authority
- JP
- Japan
- Prior art keywords
- liquid surface
- ceramic plate
- piezo
- metal plate
- transister
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Level Indicators Using A Float (AREA)
Abstract
PURPOSE: To provide device, having no mechanically movable parts, through simple circuit, by arranging, in contact with fluid, piezo-electric ceramic plate, while AC signal is applied onto the ceramic plate generating oscillation and detection is performed on its vibrating condition.
CONSTITUTION: Metal plate 22 is inserted into bottom part of case 24 and on it, piezo-electric ceramic plate 21, electrode 23 are adhered closely, and a device, led out by lead wire 25 is set in contact with liquid surface S. Lead wire 25 is connected with circuit as indicated in the figure. That is, when rectangular wave, oscillated by multi-vibrator MV, is applied and if liquid surface S lies in upper position than metal plate (as shown in the figure), piezo-ceramic plate 21 will introduce flexible vibration to liquis S and impedance becomes lower, terminal voltage of resistance R ascents and the wave is detected and transister Tr is set at ON. If liquid surface S is in lower position and metal plate 22 is exposed in air, then transister Tr works with reverse motion. Accordingly, at that time, buzzer, etc. is energized by relay R1, provided in collector, and indicates variation at level of liquid surface.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1786079A JPS55110917A (en) | 1979-02-20 | 1979-02-20 | Detecting device for liquid condition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1786079A JPS55110917A (en) | 1979-02-20 | 1979-02-20 | Detecting device for liquid condition |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55110917A true JPS55110917A (en) | 1980-08-27 |
Family
ID=11955401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1786079A Pending JPS55110917A (en) | 1979-02-20 | 1979-02-20 | Detecting device for liquid condition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55110917A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565942A (en) * | 1983-07-01 | 1986-01-21 | Murata Manufacturing Co., Ltd. | Energy trapped piezoelectric resonator liquid sensor |
-
1979
- 1979-02-20 JP JP1786079A patent/JPS55110917A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565942A (en) * | 1983-07-01 | 1986-01-21 | Murata Manufacturing Co., Ltd. | Energy trapped piezoelectric resonator liquid sensor |
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