CN211402234U - Dissolved oxygen electrode adapter - Google Patents
Dissolved oxygen electrode adapter Download PDFInfo
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- CN211402234U CN211402234U CN201922367588.5U CN201922367588U CN211402234U CN 211402234 U CN211402234 U CN 211402234U CN 201922367588 U CN201922367588 U CN 201922367588U CN 211402234 U CN211402234 U CN 211402234U
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- resistor
- dissolved oxygen
- oxygen electrode
- power supply
- electrode
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Abstract
The utility model discloses an oxygen dissolving electrode adapter, which comprises a shell, wherein the shell is provided with an input connector for connecting a polarographic oxygen dissolving electrode and an output connector for connecting a primary cell type measuring instrument; a dissolved oxygen electrode power supply circuit and a signal filtering output circuit are arranged in the shell; the input joint, the dissolved oxygen electrode power supply circuit, the signal filtering output circuit and the output joint are sequentially connected. The utility model provides a dissolved oxygen electrode adapter can realize the switching of polarographic dissolved oxygen electrode and galvanic cell type dissolved oxygen electrode, full play two kinds of advantages of dissolved oxygen electrode, reduction equipment input cost.
Description
Technical Field
The utility model relates to a dissolved oxygen measures the field, especially relates to a dissolved oxygen electrode adapter.
Background
At present, two methods are adopted for measuring dissolved oxygen in a solution by an electrode method: the polarography and the galvanic cell.
The working principle of polarography is shown in figure 1: the polarographic dissolved oxygen electrode comprises a first cathode 2 ', a first anode 3', a first electrolyte 5 ', a first semi-permeable membrane 1' and other main components, and under the action of an external direct current polarization battery 4 ', oxygen dissolved in water passes through the first semi-permeable membrane 1' and reaches the cathode to generate reduction reaction. The polarographic dissolved oxygen electrode is connected with a polarographic measuring instrument 11'.
The working principle of the primary battery method is shown in figure 2: the galvanic oxygen-dissolving electrode is composed of the main components of the second cathode 7 ', the second anode 8', the second electrolyte 9 ', and the second semipermeable membrane 6'. The cathode and the anode can generate electricity by spontaneous polarization in the solution without applying a polarization voltage. The reduction reaction occurs when oxygen molecules dissolved in water pass through the second semi-permeable membrane 6' to the cathode. The galvanic oxygen-dissolving electrode is connected to a galvanic measuring instrument 10'.
Under the condition that the reaction reaches the equilibrium stability, the current formed by the electrochemical reaction is in a certain relationship with the partial pressure (concentration) of oxygen:
I＝n×F×A×D×S×pO2/d
wherein I is the sensor current [ nA](ii) a n is the number of electromigration (n-4); f is the faraday constant (F-96485C/mol); a is the cathode surface area size [ cm ]2](ii) a D is the diffusion coefficient of oxygen molecules on the membrane [ cm [)2/s](ii) a S is the oxygen solubility [ mol/(cm) of the membrane3*bar)]；pO2Is the partial pressure of oxygen [ bar](ii) a d is the film thickness [ cm ]]。
Therefore, the partial pressure of dissolved oxygen in water can be calculated according to the current intensity generated by the electrochemical process, and then the concentration of dissolved oxygen in water can be obtained according to Henry's law. Henry's law is one of the basic laws of physical chemistry, discovered by Henry (Henry) in the uk in 1803 when studying the solubility law of gases in liquids. It can be expressed as: in a sealed container at a certain temperature, the partial pressure of a gas is proportional to the molar concentration of the gas dissolved in the solution.
According to the characteristics, the dissolved oxygen instrument is divided into two types: the polarographic type and the galvanic cell type. During the use process, the polarographic instrument must be matched with a polarographic dissolved oxygen electrode for use, otherwise, measurement errors can be generated. The electrodes are passed through the connected instrument to obtain the required applied polarizing voltage. However, the current drawback is that both types of instruments are specialized and not universal to each other.
The galvanic cell type instrument must be used with galvanic cell type dissolved oxygen electrodes, otherwise measurement errors can occur.
Polarographic dissolved oxygen electrode has the advantages of relatively long overall working life and the disadvantages of: 1) a certain preheating time is needed before measurement; 2) oxygen needs to be consumed during the measurement process; 3) the sample needs to be kept flowing (stirred) during measurement; 4) requiring regular maintenance and recalibration.
The primary cell type oxygen-dissolving electrode has the advantages of no preheating time, and is more stable and accurate than a polarographic type electrode under a low dissolved oxygen level. However, the disadvantages include: 1) oxygen is consumed in the measurement process; 2) the sample needs to be kept flowing (stirred) during measurement; 3) the electrodes are prone to wear during regular maintenance and recalibration.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a dissolved oxygen electrode adapter, its structure is small and exquisite, can realize polarographic dissolved oxygen electrode and galvanic cell type dissolved oxygen electrode's switching, full play two kinds of dissolved oxygen electrode's advantages, and equipment input cost is low.
In order to achieve the purpose, the utility model provides an oxygen dissolving electrode adapter, which comprises a shell, wherein the shell is provided with an input connector for connecting a polarographic oxygen dissolving electrode and an output connector for connecting a primary cell type measuring instrument; a dissolved oxygen electrode power supply circuit and a signal filtering output circuit are arranged in the shell; the input joint, the dissolved oxygen electrode power supply circuit, the signal filtering output circuit and the output joint are sequentially connected.
As a further improvement of the utility model, the dissolved oxygen electrode power supply circuit comprises a power supply and a resistor R1, a resistor R2 and a resistor R3 which are connected in sequence; the other end of the resistor R1 is connected with the negative electrode of the power supply, and the other end of the resistor R3 is connected with the positive electrode of the power supply; the common end of the resistor R1 and the resistor R2 is connected with the anode of the input connector; the negative electrode of the input connector is grounded; the common end of the resistor R2 and the resistor R3 is connected with the signal filtering output circuit.
As a further improvement of the present invention, the signal filtering output circuit includes an operational amplifier Q1, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, and a capacitor C2; one end of the resistor R6 is connected with the common end of the resistor R2 and the resistor R3, and the other end of the resistor R6 is connected with the non-inverting input end of the operational amplifier Q1; the common end of the resistor R2 and the resistor R6 is grounded through a resistor R4 and a capacitor C1 which are connected in parallel with each other; the common end of the resistor R6 and the non-inverting input end of the operational amplifier Q1 is grounded through a capacitor C2; the negative power supply terminal of the operational amplifier Q1 is grounded; the positive electrode of the power supply is connected with the positive power supply end of an operational amplifier Q1; the inverting input end of the operational amplifier Q1 is connected with the negative electrode of the input connector through a resistor R5; the inverting input end of the operational amplifier Q1 is connected with the output end of the operational amplifier Q1 through a resistor R7, and the output end of the operational amplifier Q1 is connected with the anode of the output connector; the negative pole of the output connector is grounded.
As a further improvement of the present invention, the input connector is a BNC plug, and the output connector is a BNC socket.
Advantageous effects
Compared with the prior art, the utility model discloses a dissolved oxygen electrode adapter's advantage does:
1. the compatibility of the polarographic dissolved oxygen electrode and the primary cell type dissolved oxygen measuring instrument is realized. The application range of measurement is expanded without increasing the cost of the instrument. In view of the respective advantages of the electrodes, the oxygen dissolving electrode of the primary battery is mostly applied to the conventional solution; polarographic dissolved oxygen electrodes are used in harsh environments, such as fermentation tanks. By using the adapter, the primary cell type dissolved oxygen measuring instrument can be connected with the polarographic type dissolved oxygen electrode, the application range of the instrument is expanded, the primary cell type and polarographic type dissolved oxygen measuring instruments do not need to be prepared simultaneously, one of two detection methods can be selected to test the dissolved oxygen concentration by only preparing one primary cell type dissolved oxygen measuring instrument, and the equipment investment cost is greatly reduced.
2. The advantages of two kinds of dissolved oxygen electrodes are fully exerted, and a new field of electrode method measurement is developed.
3. The same primary cell type dissolved oxygen measuring instrument can select different types of dissolved oxygen electrodes at different stages, and is very suitable for process monitoring, preliminary test projects and the like.
4. The circuit part of the dissolved oxygen electrode adapter is integrated in the shell, and the dissolved oxygen electrode adapter is small and flexible. The input connector is a BNC plug, and the output connector is a BNC socket, so that the switching is convenient.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of the working principle of the conventional polarography for measuring dissolved oxygen;
FIG. 2 is a schematic diagram of the conventional galvanic cell method for measuring dissolved oxygen;
FIG. 3 is a schematic diagram of a circuit portion of the oxygen-dissolved electrode adapter of the present invention;
fig. 4 is an external structural schematic diagram of the oxygen-dissolved electrode adapter of the present invention.
Detailed Description
Embodiments of the present invention will now be described with reference to the accompanying drawings.
Examples
The utility model discloses a concrete implementation mode is as shown in fig. 3 to fig. 4, a dissolved oxygen electrode adapter, including casing 1, be equipped with the input joint 2 that is used for connecting the polar spectrum type dissolved oxygen electrode on casing 1, still be equipped with the output joint 3 that is used for connecting galvanic cell type measuring instrument. The shell 1 is internally provided with a dissolved oxygen electrode power supply circuit 4 and a signal filtering output circuit 5. The input joint 2, the dissolved oxygen electrode power supply circuit 4, the signal filtering output circuit 5 and the output joint 3 are connected in sequence. The shell 1 is a plastic shell and plays a role in protecting a circuit.
The dissolved oxygen electrode power supply circuit 4 comprises a power supply and a resistor R1, a resistor R2 and a resistor R3 which are sequentially connected end to end. The other end of the resistor R1 is connected with the negative pole of the power supply, and the other end of the resistor R3 is connected with the positive pole of the power supply. The common terminal of the resistor R1 and the resistor R2 is connected to the positive terminal of the input connector 2. The negative pole of the input connector 2 is grounded. The common end of the resistor R2 and the resistor R3 is connected to the signal filter output circuit 5.
The signal filtering output circuit 5 includes an operational amplifier Q1, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, and a capacitor C2. One end of the resistor R6 is connected to the common end of the resistor R2 and the resistor R3, and the other end of the resistor R6 is connected to the non-inverting input terminal of the operational amplifier Q1. The common end of the resistor R2 and the resistor R6 is grounded through a resistor R4, and a capacitor C1 is connected in parallel with the resistor R4. The common terminal of the resistor R6 and the non-inverting input terminal of the operational amplifier Q1 is grounded through a capacitor C2. The negative supply terminal of the operational amplifier Q1 is connected to ground. The positive pole of the power supply is connected to the positive supply terminal of the operational amplifier Q1. The inverting input terminal of the operational amplifier Q1 is connected to the negative terminal of the input terminal 2 through a resistor R5. The inverting input terminal of the operational amplifier Q1 is connected to the output terminal of the operational amplifier Q1 via a resistor R7, and the output terminal of the operational amplifier Q1 is connected to the positive terminal of the output terminal 3. The negative pole of the output connector 3 is grounded.
In this embodiment, the input connector 2 is a BNC plug, and the output connector 3 is a BNC socket.
After the dissolved oxygen electrode adapter is respectively connected with a polarographic dissolved oxygen electrode and an original battery type measuring instrument, a dissolved oxygen electrode power supply circuit 4 of the dissolved oxygen electrode adapter provides polarization voltage for the polarographic dissolved oxygen electrode, and signals received by the polarographic dissolved oxygen electrode are subjected to filtering processing by a signal filtering output circuit 5 and then are sent to the original battery type measuring instrument. By using the dissolved oxygen electrode adapter, one galvanic cell type measuring instrument can select the corresponding polarographic dissolved oxygen electrode or galvanic cell type dissolved oxygen electrode according to the detection requirement, and the universality is good. Not only saves the equipment cost, but also can lead the primary cell type measuring instrument to be simultaneously suitable for the dissolved oxygen detection in the conventional solution and the severe environment.
The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to the above-disclosed embodiments, and various modifications, equivalent combinations, which are made according to the essence of the present invention, should be covered.
Claims (4)
1. The dissolved oxygen electrode adapter is characterized by comprising a shell (1), wherein an input connector (2) for connecting a polarographic dissolved oxygen electrode is arranged on the shell (1), and an output connector (3) for connecting an original battery type measuring instrument is also arranged on the shell; a dissolved oxygen electrode power supply circuit (4) and a signal filtering output circuit (5) are arranged in the shell (1); the input connector (2), the dissolved oxygen electrode power supply circuit (4), the signal filtering output circuit (5) and the output connector (3) are sequentially connected.
2. The dissolved oxygen electrode adapter according to claim 1, wherein the dissolved oxygen electrode power supply circuit (4) comprises a power supply and a resistor R1, a resistor R2 and a resistor R3 which are connected in sequence; the other end of the resistor R1 is connected with the negative electrode of the power supply, and the other end of the resistor R3 is connected with the positive electrode of the power supply; the common end of the resistor R1 and the resistor R2 is connected with the positive pole of the input connector (2); the negative electrode of the input joint (2) is grounded; the common end of the resistor R2 and the resistor R3 is connected with the signal filtering output circuit (5).
3. The dissolved oxygen electrode adapter according to claim 2, wherein the signal filtering output circuit (5) comprises an operational amplifier Q1, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1 and a capacitor C2; one end of the resistor R6 is connected with the common end of the resistor R2 and the resistor R3, and the other end of the resistor R6 is connected with the non-inverting input end of the operational amplifier Q1; the common end of the resistor R2 and the resistor R6 is grounded through a resistor R4 and a capacitor C1 which are connected in parallel with each other; the common end of the resistor R6 and the non-inverting input end of the operational amplifier Q1 is grounded through a capacitor C2; the negative power supply terminal of the operational amplifier Q1 is grounded; the positive electrode of the power supply is connected with the positive power supply end of an operational amplifier Q1; the inverting input end of the operational amplifier Q1 is connected with the negative electrode of the input connector (2) through a resistor R5; the inverting input end of the operational amplifier Q1 is connected with the output end of the operational amplifier Q1 through a resistor R7, and the output end of the operational amplifier Q1 is connected with the positive electrode of the output connector (3); the negative electrode of the output connector (3) is grounded.
4. A dissolved oxygen electrode adaptor according to claim 1 or 3 wherein said input connector (2) is a BNC plug and said output connector (3) is a BNC socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922367588.5U CN211402234U (en) | 2019-12-25 | 2019-12-25 | Dissolved oxygen electrode adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922367588.5U CN211402234U (en) | 2019-12-25 | 2019-12-25 | Dissolved oxygen electrode adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211402234U true CN211402234U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922367588.5U Withdrawn - After Issue CN211402234U (en) | 2019-12-25 | 2019-12-25 | Dissolved oxygen electrode adapter |
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| CN (1) | CN211402234U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865106A (en) * | 2019-12-25 | 2020-03-06 | 广州商辉仪业智能科技股份有限公司 | Dissolved oxygen electrode adapter |
-
2019
- 2019-12-25 CN CN201922367588.5U patent/CN211402234U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865106A (en) * | 2019-12-25 | 2020-03-06 | 广州商辉仪业智能科技股份有限公司 | Dissolved oxygen electrode adapter |
| CN110865106B (en) * | 2019-12-25 | 2024-09-06 | 广州商辉仪业智能科技股份有限公司 | Dissolved oxygen electrode adapter |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200901 Effective date of abandoning: 20240906 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200901 Effective date of abandoning: 20240906 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |