CN2549467Y - Instrument for measuring oxygen content in water - Google Patents
Instrument for measuring oxygen content in water Download PDFInfo
- Publication number
- CN2549467Y CN2549467Y CN 02239632 CN02239632U CN2549467Y CN 2549467 Y CN2549467 Y CN 2549467Y CN 02239632 CN02239632 CN 02239632 CN 02239632 U CN02239632 U CN 02239632U CN 2549467 Y CN2549467 Y CN 2549467Y
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- China
- Prior art keywords
- voltage
- amplifier
- oxygen content
- water
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- Expired - Fee Related
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Abstract
The utility model relates to an instrument for measuring oxygen content in water, which comprises an oxygen content electrode C. A voltage regulation diode T is connected with the anode of a calculating amplifier I through a potentiometer R; the output of the calculating amplifier I is connected with the G pole of a field transistor; the oxygen content electrode C is connected with the S pole of the field transistor and connected with the cathode of the calculating amplifier I at the same time; the D pole of the field transistor is serially connected with the voltage sampling resistance R1; the voltage on the voltage sampling resistance R1 is connected with an A/D converter through an amplifier. The design adopts the circuit consisting of the voltage regulation diode, calculating amplifier and field transistor; the circuit has simple structure, low cost and artful design, and provides stable work voltage to the oxygen content electrode.
Description
Affiliated technical field
The utility model belongs to electronic technology field, is specifically related to monitor the equipment of the content of oxygen in water, its induction electrode is provided the improvement of constant operating voltage part.
Background technology
Dissolved oxygen DO is an important indicator in the water quality monitoring, and its ultimate principle is to utilize electrochemical method, makes oxygen in water discharge electronics on electrode, the electric current that forms in the metering circuit again, and this electric current is directly proportional with the concentration of dissolved oxygen DO.Because the strength of current of this reaction is very little, thus need provide constant operating voltage to induction electrode, and convert small kinetic current to A/D change-over circuit use that suitable voltage signal is exported to the back.The at present this water-soluble oxygen measuring device of separating does not all have good way to solve aspect above-mentioned two.
Summary of the invention
The purpose of this utility model is to provide a kind of to the constant water-soluble oxygen measuring device of separating of induction electrode power supply for addressing the above problem.
For the utility model that achieves the above object is a kind of water-soluble oxygen measuring device of realizing like this of separating, comprise dissolved oxygen electrode, voltage stabilizing diode is through the positive pole of a potentiometer concatenation operation amplifier, the output of this operational amplifier connects the G utmost point of field effect transistor, and described dissolved oxygen electrode connects the S utmost point of described field effect transistor and connects the negative pole of above-mentioned operational amplifier simultaneously; The D utmost point series voltage sample resistance of above-mentioned field effect transistor, the voltage on the voltage sampling resistor is exported to A/D converter through amplifier.
Above-mentioned amplifier is to be that operational amplifier is connected to each other the amplifying circuit that constitutes by three operational amplifiers.
Advantage and effect
Advantage of the present utility model and good effect are the circuit that the design adopts voltage stabilizing diode, operational amplifier, field effect transistor to form, and be simple in structure, cost is low, design is ingenious.This circuit can provide constant operating voltage for dissolved oxygen electrode.For kinetic current is converted to voltage signal, at the D of the field effect transistor utmost point resistance of connecting, the amplifying circuit that this ohmically voltage is formed via three operational amplifiers is transformed into and is fit to voltage and supplies with the A/D conversion circuit and use again.
Description of drawings
Fig. 1 represents circuit diagram of the present utility model.
Specific embodiment
A kind of water-soluble oxygen measuring device of separating comprises dissolved oxygen electrode C, and the voltage stabilizing diode T of 1.23V can provide the burning voltage output of 1.23V, through a potentiometer R, with operating voltage 0.7～0.8V of the voltage modulated dissolved oxygen electrode C of voltage stabilizing diode T output.Connect the positive pole of exporting to operational amplifier 1, the G utmost point that the output of this operational amplifier 1 connects field effect transistor forms voltage follower circuit, dissolved oxygen electrode C connects the S utmost point of field effect transistor and the negative pole of the amplifier of concatenation operation simultaneously 1, makes the voltage of the above-mentioned voltage follower circuit that is formed by operational amplifier 1 and field effect transistor add to dissolved oxygen electrode C; This voltage follower circuit also constitutes constant current source together with dissolved oxygen electrode C simultaneously, the voltage sampling resistor R1 that is connected on the D utmost point of field effect transistor converts the output current of dissolved oxygen electrode C to voltage, and the voltage on the voltage sampling resistor R1 is through being that operational amplifier 2,3,4 is connected to each other the voltage signal that the amplifying circuit that constitutes is amplified to 0～2V and uses for A/D converter by three operational amplifiers.
Claims (2)
1. water-soluble oxygen measuring device of separating, comprise dissolved oxygen electrode (C), it is characterized in that: voltage stabilizing diode (T) is through the positive pole of a potentiometer (R) concatenation operation amplifier (1), the output of this operational amplifier (1) connects the G utmost point of field effect transistor, and described dissolved oxygen electrode (C) connects the S utmost point of described field effect transistor and connects the negative pole of above-mentioned operational amplifier (1) simultaneously; The D utmost point series voltage sample resistance (R1) of above-mentioned field effect transistor, the voltage on the voltage sampling resistor (R1) connects A/D converter through amplifier.
2. the water-soluble oxygen measuring device of separating according to claim 1 is characterized in that: above-mentioned amplifier is to be the amplifying circuit that operational amplifier (2,3,4) is connected to each other formation by three operational amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02239632 CN2549467Y (en) | 2002-07-05 | 2002-07-05 | Instrument for measuring oxygen content in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02239632 CN2549467Y (en) | 2002-07-05 | 2002-07-05 | Instrument for measuring oxygen content in water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2549467Y true CN2549467Y (en) | 2003-05-07 |
Family
ID=33712962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02239632 Expired - Fee Related CN2549467Y (en) | 2002-07-05 | 2002-07-05 | Instrument for measuring oxygen content in water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2549467Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235023A (en) * | 2013-03-27 | 2013-08-07 | 江苏蓝韵凯泰医疗设备有限公司 | Medical oxygen concentration intelligent monitoring system and method |
| CN105067675A (en) * | 2015-08-20 | 2015-11-18 | 四川卡夫检测技术有限公司 | Milk product true protein determinator and determination method thereof |
-
2002
- 2002-07-05 CN CN 02239632 patent/CN2549467Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235023A (en) * | 2013-03-27 | 2013-08-07 | 江苏蓝韵凯泰医疗设备有限公司 | Medical oxygen concentration intelligent monitoring system and method |
| CN105067675A (en) * | 2015-08-20 | 2015-11-18 | 四川卡夫检测技术有限公司 | Milk product true protein determinator and determination method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |