JPH0317519U - - Google Patents
Info
- Publication number
- JPH0317519U JPH0317519U JP7734689U JP7734689U JPH0317519U JP H0317519 U JPH0317519 U JP H0317519U JP 7734689 U JP7734689 U JP 7734689U JP 7734689 U JP7734689 U JP 7734689U JP H0317519 U JPH0317519 U JP H0317519U
- Authority
- JP
- Japan
- Prior art keywords
- fluid
- measured
- ultrasonic transducer
- conduit
- ultrasonic
- 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.)
- Granted
Links
- 230000005284 excitation Effects 0.000 claims description 3
- 238000002847 impedance measurement Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 4
- 230000005855 radiation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
第１図は本考案の１実施例の構成を示すブロツ
ク図、第２図は第１図に示す超音波振動子の共振
点付近で小信号で励振したときの負荷インピーダ
ンスを示す等価回路図、第３図は本考案の他の要
部実施例を示す部分断面図、第４図は本考案のさ
らに他の要部実施例を示す部分断面図、第５図は
従来の電磁流量計の構成を示すブロツク図である
。
１０，２８……導管、１３……演算回路、１６
……励磁回路、１７……超音波送受波器、１９…
…パルス送信回路、２０……パルス受信回路、２
３……サンプル／ホールド回路、２４……コンパ
レータ、２６……空検知回路、３２……高域炉波
器、３３……低域炉波器、３４……加算器、３５
……流量演算器、３６……ホールド回路、３８，
４１，４２……超音波振動子、３９……超音波励
振回路、４０……インピーダンス測定回路。
Fig. 1 is a block diagram showing the configuration of one embodiment of the present invention, Fig. 2 is an equivalent circuit diagram showing the load impedance when excited with a small signal near the resonance point of the ultrasonic transducer shown in Fig. 1; Fig. 3 is a partial sectional view showing another embodiment of the main part of the present invention, Fig. 4 is a partial sectional view showing still another embodiment of the main part of the invention, and Fig. 5 is the configuration of a conventional electromagnetic flowmeter. FIG. 10, 28... Conduit, 13... Arithmetic circuit, 16
...Excitation circuit, 17...Ultrasonic transducer, 19...
...Pulse transmitting circuit, 20...Pulse receiving circuit, 2
3...Sample/hold circuit, 24...Comparator, 26...Empty detection circuit, 32...High range wave generator, 33...Low range wave generator, 34...Adder, 35
...Flow rate calculator, 36...Hold circuit, 38,
41, 42... Ultrasonic transducer, 39... Ultrasonic excitation circuit, 40... Impedance measurement circuit.
Claims (1)
に対応した起電力を検出する電磁流量計において
、前記測定流体を流す導管の外面或いはそと近傍
のいずれかに設けられた超音波振動子と、この超
音波振動子を駆動する超音波励振手段と、前記超
音波振動子の放射インピーダンスを測定するイン
ピーダンス測定手段とを具備し、前記放射インピ
ーダンスの所定の変化から前記導管の中の測定流
体が空であることを検出するようにしたことを特
徴とする電磁流量計。 In an electromagnetic flowmeter that applies a magnetic field to a fluid to be measured and detects an electromotive force corresponding to the flow rate of the fluid to be measured, an ultrasonic vibrator provided either on the outer surface or near the outside of a conduit through which the fluid to be measured flows; The apparatus includes ultrasonic excitation means for driving the ultrasonic transducer and impedance measurement means for measuring radiation impedance of the ultrasonic transducer, and the measuring fluid in the conduit is emptied from a predetermined change in the radiation impedance. An electromagnetic flowmeter characterized by detecting that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7734689U JPH0712899Y2 (en) | 1989-06-30 | 1989-06-30 | Electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7734689U JPH0712899Y2 (en) | 1989-06-30 | 1989-06-30 | Electromagnetic flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0317519U true JPH0317519U (en) | 1991-02-21 |
| JPH0712899Y2 JPH0712899Y2 (en) | 1995-03-29 |
Family
ID=31619648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7734689U Expired - Lifetime JPH0712899Y2 (en) | 1989-06-30 | 1989-06-30 | Electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712899Y2 (en) |
-
1989
- 1989-06-30 JP JP7734689U patent/JPH0712899Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0712899Y2 (en) | 1995-03-29 |
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