JPH0250799U - - Google Patents
Info
- Publication number
- JPH0250799U JPH0250799U JP13065988U JP13065988U JPH0250799U JP H0250799 U JPH0250799 U JP H0250799U JP 13065988 U JP13065988 U JP 13065988U JP 13065988 U JP13065988 U JP 13065988U JP H0250799 U JPH0250799 U JP H0250799U
- Authority
- JP
- Japan
- Prior art keywords
- switch
- capacitor
- relay
- signal transmitter
- discharge
- 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
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 238000002847 impedance measurement Methods 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
第１図は本考案のリレー駆動回路、第２図は従
来の２線式信号伝送器の構成図、第３図は第２の
従来装置の動作を説明するための波形図、第４図
はインピーダンス測定機能を持つｐＨ測定回路の
回路図である。
ＳＥ…センサ、１…プリアンプ、１５…充電回
路、１６…コンデンサ、１７…第１のスイツチ、
１８…リレー、１９…第２のスイツチ。
Fig. 1 is a relay drive circuit of the present invention, Fig. 2 is a configuration diagram of a conventional two-wire signal transmitter, Fig. 3 is a waveform diagram for explaining the operation of the second conventional device, and Fig. 4 is a waveform diagram for explaining the operation of the second conventional device. FIG. 2 is a circuit diagram of a pH measurement circuit having an impedance measurement function. SE...sensor, 1...preamplifier, 15...charging circuit, 16...capacitor, 17...first switch,
18...Relay, 19...Second switch.
Claims (1)
センサのインピーダンス測定が行われる２線式信
号伝送器において、この信号伝送器の動作電流に
よつて充電されるコンデンサと、このコンデンサ
の充電回路に設けられた第１のスイツチと、前記
コンデンサに第２のスイツチを介し接続されたリ
レーとを設け、前記第１のスイツチを閉、前記第
２のスイツチを開にし、前記動作電流によつて一
定時間、前記コンデンサを充電し、この電荷を前
記第１のスイツチを開、前記第２のスイツチを閉
にして前記リレーのコイルに放電し、この放電電
流によつて前記リレーを一定時間駆動し前記測定
回路を切換えるようにしたことを特徴とする２線
式信号伝送器におけるリレー駆動回路。 In a two-wire signal transmitter that measures the impedance of a high-resistance sensor by switching the measurement circuit during measurement, there is a capacitor that is charged by the operating current of this signal transmitter, and a capacitor that is installed in the charging circuit of this capacitor. a first switch connected to the capacitor through a second switch, the first switch is closed, the second switch is opened, and the operation current is applied for a certain period of time. The capacitor is charged, and the first switch is opened and the second switch is closed to discharge this charge to the coil of the relay, and this discharge current drives the relay for a certain period of time to discharge the charge to the measuring circuit. A relay drive circuit in a two-wire signal transmitter, characterized in that the relay drive circuit is configured to switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13065988U JPH0250799U (en) | 1988-10-05 | 1988-10-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13065988U JPH0250799U (en) | 1988-10-05 | 1988-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0250799U true JPH0250799U (en) | 1990-04-10 |
Family
ID=31386026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13065988U Pending JPH0250799U (en) | 1988-10-05 | 1988-10-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0250799U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013160654A (en) * | 2012-02-06 | 2013-08-19 | Seiko Epson Corp | Sensor device |
-
1988
- 1988-10-05 JP JP13065988U patent/JPH0250799U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013160654A (en) * | 2012-02-06 | 2013-08-19 | Seiko Epson Corp | Sensor device |
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