JPH0234607Y2 - - Google Patents
Info
- Publication number
- JPH0234607Y2 JPH0234607Y2 JP4330882U JP4330882U JPH0234607Y2 JP H0234607 Y2 JPH0234607 Y2 JP H0234607Y2 JP 4330882 U JP4330882 U JP 4330882U JP 4330882 U JP4330882 U JP 4330882U JP H0234607 Y2 JPH0234607 Y2 JP H0234607Y2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- polar
- capacitors
- capacitor
- converter
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
【考案の詳細な説明】
本考案は、工業的に使用されるPH変換器に関す
る。[Detailed Description of the Invention] The present invention relates to a PH converter for industrial use.
従来から、第１図に示すようなPH測定装置が知
られている。第１図において、１はガラス電極、
２は比較電極、３は液アース、４はPH変換器、５
は受信部である。PH変換器４は、ガラス電極用端
子（以下、GE端子と呼ぶ）６と、比較電極用端
子（以下、RE端子と呼ぶ）７と、アース端子
（以下、SE端子と呼ぶ）８と、バツフアアンプ９
と、無極性コンデンサ１０及び１１と、一対の出
力端子１２及び１３と、ガード端子１４と、交流
電源１５に接続され直流電圧Ｖ＋及びＶ−をバツ
フアアンプ９に供給する電源回路１６とで構成さ
れている。 Conventionally, a PH measuring device as shown in FIG. 1 has been known. In FIG. 1, 1 is a glass electrode;
2 is a reference electrode, 3 is a liquid earth, 4 is a PH converter, 5
is the receiving section. The PH converter 4 includes a glass electrode terminal (hereinafter referred to as GE terminal) 6, a reference electrode terminal (hereinafter referred to as RE terminal) 7, a ground terminal (hereinafter referred to as SE terminal) 8, and a buffer amplifier. 9
, non-polar capacitors 10 and 11, a pair of output terminals 12 and 13, a guard terminal 14, and a power supply circuit 16 connected to an AC power supply 15 and supplying DC voltages V+ and V- to the buffer amplifier 9. There is.
上記PH変換器４は、ガラス電極１と比較電極間
で検出される被測定液のPHに対応する信号をバツ
フアアンプ９を介して受信部５に出力するように
なつている。この動作時に、出力信号ライン１７
や電源ライン１８に流れる交流ノイズ電流inが、
各電極を通じて被測定液に流れ込んでも、液アー
ス３及びコンデンサ１０で構成される回路がある
ため、交流ノイズ電圧in×Rr（Rr……比較電極２
の内部抵抗）は、GE端子６とRE端子７間に検出
されない。又、被測定液がアースに対して交流電
位を持つていたとしても、コンデンサ１１によつ
て液電位を交流的に零電位におとすので、安定し
た信号検出を行える。これらの挙動において、コ
ンデンサ１０及び１１に印加される電圧は、双極
性であるので、コンデンサ１０及び１１として、
無極性のものが必要とされる。 The PH converter 4 is configured to output a signal corresponding to the PH of the liquid to be measured detected between the glass electrode 1 and the comparison electrode to the receiving section 5 via the buffer amplifier 9. During this operation, the output signal line 17
The AC noise current in flowing through the power supply line 18 is
Even if it flows into the liquid to be measured through each electrode, there is a circuit consisting of the liquid earth 3 and the capacitor 10, so the AC noise voltage in×Rr (Rr...comparison electrode 2
internal resistance) is not detected between GE terminal 6 and RE terminal 7. Furthermore, even if the liquid to be measured has an alternating current potential with respect to the ground, the capacitor 11 brings the liquid potential to zero alternating potential, so that stable signal detection can be performed. In these behaviors, the voltage applied to capacitors 10 and 11 is bipolar, so as capacitors 10 and 11,
Non-polar is required.
しかし、無極性のコンデンサは高価なので、従
来のPH変換回路では、２個の有極性のコンデンサ
を直列接続し、１個の無極性のコンデンサの代替
をさせる構成となつている（有極性のコンデンサ
の２個は、無極性のコンデンサ１個より価格的に
有利である）。即ち、第１図の構成の変換器４に
あつては、コンデンサ１０，１１の代わりに合計
４個の有極性コンデンサを用いていた。 However, non-polar capacitors are expensive, so in conventional PH conversion circuits, two polar capacitors are connected in series to replace one non-polar capacitor. (Two capacitors are more cost-effective than one non-polar capacitor.) That is, in the converter 4 having the configuration shown in FIG. 1, a total of four polar capacitors were used in place of the capacitors 10 and 11.
本考案は、この点に鑑みてなされたもので、そ
の目的は、上記有極性コンデンサの個数を低減す
ることにある。 The present invention has been made in view of this point, and its purpose is to reduce the number of polar capacitors.
以下、図面を参照し本考案を詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
第２図は本考案によるPH変換器の一実施例の説
明図である（第１図と同一部分には同一符号を付
した）。本考案のPH変換器４のコンデンサ回路は、
RE端子７とSE端子８との間に直列接続される有
極性コンデンサ２１及び２２と、この接続点Ａと
ガード端子１４間に接続される有極性コンデンサ
２３とで構成されている。 FIG. 2 is an explanatory diagram of an embodiment of the PH converter according to the present invention (the same parts as in FIG. 1 are given the same reference numerals). The capacitor circuit of the PH converter 4 of the present invention is
It consists of polar capacitors 21 and 22 connected in series between the RE terminal 7 and the SE terminal 8, and a polar capacitor 23 connected between this connection point A and the guard terminal 14.
上記構成において、各有極性コンデンサの容量
値をＣ、耐電圧をVcとすれば、RE端子７とSE
端子８間の容量値C1はＣ／２、又、耐圧V1はVc
となり、SE端子８とガード端子１４間の容量値
C2もＣ／２、又、耐圧V2もVcとなる。このた
め、各容量値C1及びC2、並びに耐圧V1及びV2
が、無極性コンデンサを用いた場合に対応する値
となるように、有極性コンデンサの仕様を選択す
ればよい。 In the above configuration, if the capacitance value of each polar capacitor is C and the withstand voltage is Vc, then RE terminal 7 and SE
The capacitance value C 1 between terminals 8 is C/2, and the withstand voltage V 1 is Vc
Then, the capacitance value between SE terminal 8 and guard terminal 14 is
C 2 is also C/2, and the breakdown voltage V 2 is also Vc. Therefore, each capacitance value C 1 and C 2 and breakdown voltage V 1 and V 2
The specifications of the polar capacitor may be selected so that the value corresponds to the value when a non-polar capacitor is used.
尚、上記実施例において、有極性コンデンサ２
１及び２２の一方の端子が、RE端子７、又は、
SE端子８に直接接続されるようになつているが、
実際の回路にあつては、抵抗等の回路素子を介し
て、それぞれの端子に接続される場合がある。
又、同じことが有極性コンデンサ２３の接続回路
についても言える。 In addition, in the above embodiment, the polar capacitor 2
One terminal of 1 and 22 is RE terminal 7, or
Although it is designed to be connected directly to SE terminal 8,
In an actual circuit, these may be connected to respective terminals via circuit elements such as resistors.
Moreover, the same can be said about the connection circuit of the polar capacitor 23.
以上説明したように、本考案によるPH変換回路
は、RE端子ラインとSE端子ラインとの間に、直
列的に２個の有極性コンデンサを接続し、このコ
ンデンサ同士の接続点とガード端子との間に１個
の有極性コンデンサを接続する構成になつてい
る。このため、従来のように、単に、有極性コン
デンサ２個で１個の無極性コンデンサの代替をさ
せる構成に比べて、コンデンサの数が１つ少なく
なるので、PH変換器がより安価になり、回路構成
も簡単になる。 As explained above, the PH conversion circuit according to the present invention connects two polar capacitors in series between the RE terminal line and the SE terminal line, and connects the connection point between the capacitors with the guard terminal. The configuration is such that one polar capacitor is connected between them. Therefore, compared to the conventional configuration in which two polar capacitors are used instead of one non-polar capacitor, the number of capacitors is reduced by one, making the PH converter cheaper. The circuit configuration also becomes simpler.
第１図は従来のPH測定装置の説明図、第２図は
本考案の一実施例の説明図である。
１……ガラス電極、２……比較電極、３……液
アース、４……PH変換器、５……受信部、６……
GE端子、７……RE端子、８……SE端子、９…
…バツフアアンプ、１０，１１……無極性コンデ
ンサ、１２，１３……信号出力端子、１４……ガ
ード端子、１５……交流電源、１６……電源回
路、１７……信号伝送ライン、２１，２２，２３
……有極性コンデンサ。
FIG. 1 is an explanatory diagram of a conventional PH measuring device, and FIG. 2 is an explanatory diagram of an embodiment of the present invention. 1...Glass electrode, 2...Reference electrode, 3...Liquid earth, 4...PH converter, 5...Receiving section, 6...
GE terminal, 7...RE terminal, 8...SE terminal, 9...
... Buffer amplifier, 10, 11 ... Non-polar capacitor, 12, 13 ... Signal output terminal, 14 ... Guard terminal, 15 ... AC power supply, 16 ... Power supply circuit, 17 ... Signal transmission line, 21, 22, 23
...Polarized capacitor.
Claims (1)
及び液アース用端子を有すると共に、出力側に一
対の信号出力端子及びガード端子を有するPH変換
器において、前記比較電極用端子ラインと液アー
ス用端子ラインとの間に第１および第２の有極性
コンデンサを互いの負側端子同志が接続されるよ
うに直列接続すると共に、第３有極性コンデンサ
の負側端子を前記第１及び第２の有極性コンデン
サ同志の接続点に接続し正側端子を前記ガード端
子に接続したことを特徴とするPH変換器。 Glass electrode terminal, reference electrode terminal,
and a liquid earth terminal, and a pair of signal output terminals and a guard terminal on the output side. The polar capacitors are connected in series so that their negative terminals are connected to each other, and the negative terminal of the third polar capacitor is connected to the connection point of the first and second polar capacitors to form a positive terminal. is connected to the guard terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4330882U JPS58165663U (en) | 1982-03-26 | 1982-03-26 | PH converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4330882U JPS58165663U (en) | 1982-03-26 | 1982-03-26 | PH converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58165663U JPS58165663U (en) | 1983-11-04 |
| JPH0234607Y2 true JPH0234607Y2 (en) | 1990-09-18 |
Family
ID=30054402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4330882U Granted JPS58165663U (en) | 1982-03-26 | 1982-03-26 | PH converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58165663U (en) |
-
1982
- 1982-03-26 JP JP4330882U patent/JPS58165663U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58165663U (en) | 1983-11-04 |
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