JPH01180716U - - Google Patents
Info
- Publication number
- JPH01180716U JPH01180716U JP7374388U JP7374388U JPH01180716U JP H01180716 U JPH01180716 U JP H01180716U JP 7374388 U JP7374388 U JP 7374388U JP 7374388 U JP7374388 U JP 7374388U JP H01180716 U JPH01180716 U JP H01180716U
- Authority
- JP
- Japan
- Prior art keywords
- pass filter
- frequency
- time constant
- demodulating
- outputting
- 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
- 238000010586 diagram Methods 0.000 description 3
- 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図は従来の電磁流量計の構成を示すブ
ロツク図、第３図は第２図に示す各部の波形を示
す波形図である。
１０……導管、１２……励磁コイル、１３……
励磁回路、１６，１７……低域波器、１８……
タイミング回路、１９，２６……ローパスフイル
タ、２０，２７……ハイパスフイルタ、２１……
加算点、２３……雑音検出回路、２８……モード
切替回路、２９……時定数変更回路、３０……ク
ロツク発生器、３１……選択回路、３２……時定
数選定回路、ＳＭ……モード切替信号、ＳＣ１，
ＳＣ２，ＳＣ３……変更信号、ＳＳ……選定信号
、ＳＴ……タイミング信号。
Figure 1 is a block diagram showing the configuration of one embodiment of the present invention, Figure 2 is a block diagram showing the configuration of a conventional electromagnetic flowmeter, and Figure 3 is a waveform diagram showing the waveforms of each part shown in Figure 2. be. 10... Conduit, 12... Excitation coil, 13...
Excitation circuit, 16, 17...Low frequency device, 18...
Timing circuit, 19, 26...Low pass filter, 20, 27...High pass filter, 21...
Addition point, 23... Noise detection circuit, 28... Mode switching circuit, 29... Time constant changing circuit, 30... Clock generator, 31... Selection circuit, 32... Time constant selection circuit, SM... Mode Switching signal, SC 1 ,
SC2 , SC3 ...change signal, SS...selection signal, ST...timing signal.
Claims (1)
異なつた周波数を有する磁場を供給する励磁手段
と、この励磁手段により励磁され流量に対応して
発生する信号電圧を前記第１周波数に基づいて弁
別して出力する第１復調手段と、この第１復調手
段の出力を高域波するハイパスフイルタと、前
記信号電圧を前記第２周波数に基づいて弁別して
復調する第２復調手段と、この第２復調手段の出
力を低域波するローパスフイルタと、前記ハイ
パスフイルタと前記ローパスフイルタとの各出力
を加算的に合成する加算手段と、前記第２復調手
段の出力揺動が所定値を越えたときに前記加算出
力側に切り替えると共にタイミング信号を出力し
前記所定値以下のときに前記第２復調出力側に切
り替えるモード切替手段と、前記第２復調手段の
出力揺動の大きさに応じて前記ハイパスフイルタ
と前記ローパスフイルタの時定数を変更する変更
信号をこれ等に出力する時定数変更手段と、前記
加算手段側に切り替えられた状態でこの変更され
た時定数のうち最も多く選定された最多時定数を
選定してこの選定信号を前記時定数変更手段に出
力する時定数選定手段とを具備し、前記タイミン
グ信号が発生したときに前記選定信号に対応した
前記変更信号を設定するようにしたことを特徴と
する電磁流量計。 excitation means for supplying magnetic fields having two different frequencies, a first frequency and a second frequency lower than the first frequency; a first demodulating means for separately outputting; a high-pass filter for converting the output of the first demodulating means into a high frequency; a second demodulating means for discriminating and demodulating the signal voltage based on the second frequency; a low-pass filter that converts the output of the means into a low frequency band; an adding means that additively combines the respective outputs of the high-pass filter and the low-pass filter; and when the output fluctuation of the second demodulating means exceeds a predetermined value. mode switching means for switching to the addition output side and outputting a timing signal and switching to the second demodulation output side when the value is equal to or less than the predetermined value; and a time constant changing means for outputting a change signal for changing the time constant of the low-pass filter, and a time constant selected most frequently among the changed time constants in a state where the switching means is switched to the adding means side. and a time constant selection means for selecting a selection signal and outputting the selection signal to the time constant changing means, and setting the change signal corresponding to the selection signal when the timing signal is generated. Features of electromagnetic flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7374388U JPH0623938Y2 (en) | 1988-06-02 | 1988-06-02 | Electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7374388U JPH0623938Y2 (en) | 1988-06-02 | 1988-06-02 | Electromagnetic flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01180716U true JPH01180716U (en) | 1989-12-26 |
| JPH0623938Y2 JPH0623938Y2 (en) | 1994-06-22 |
Family
ID=31298875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7374388U Expired - Lifetime JPH0623938Y2 (en) | 1988-06-02 | 1988-06-02 | Electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623938Y2 (en) |
-
1988
- 1988-06-02 JP JP7374388U patent/JPH0623938Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0623938Y2 (en) | 1994-06-22 |
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