CN215297229U - Novel dissolved oxygen sensor - Google Patents
Novel dissolved oxygen sensor Download PDFInfo
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- CN215297229U CN215297229U CN202121177495.7U CN202121177495U CN215297229U CN 215297229 U CN215297229 U CN 215297229U CN 202121177495 U CN202121177495 U CN 202121177495U CN 215297229 U CN215297229 U CN 215297229U
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Abstract
The utility model discloses a novel dissolved oxygen sensor, which comprises a sensor shell and electrolyte, a cathode, an anode and a signal circuit board in the shell, wherein the signal circuit board comprises a signal acquisition circuit, the cathode is led out through a wire to obtain a cathode wire, the anode is led out through another wire to obtain an anode wire, and the cathode wire and the anode wire are detachably connected with the signal acquisition circuit through wire terminals; the signal acquisition circuit comprises an amplifier and a resistor arranged between the positive input end and the negative input end of the amplifier, one end of the resistor is connected with the anode wire through a wire terminal, and the other end of the resistor is connected with the cathode wire through a wire terminal; the effect is as follows: the connection between the electrode and the signal acquisition circuit is disconnected through the wire terminal, so that the cathode and the anode of the sensor are not conducted, the current loop cannot be formed, the redox reaction is not generated, the electrode and the electrolyte in the sensor are not consumed, and the defect of reduction of the service life caused by the redox reaction is overcome.
Description
Technical Field
The utility model belongs to the technical field of the sensor, concretely relates to novel dissolved oxygen sensor.
Background
The structure of the existing dissolved oxygen sensor is shown in fig. 1, and the measurement principle is as follows: the cathode is made of noble metal; the anode is made of lead. When external oxygen molecules enter the sensor through the film and reach the surface of the cathode, the oxygen molecules are reduced; at the same time, the lead anode is oxidized. Namely: oxygen is reduced to hydroxyl ions at the cathode and simultaneously gains electrons to the external circuit; the lead anode is corroded by the potassium hydroxide solution to generate potassium hydrogen plumbate, and meanwhile, electrons are output to an external circuit to generate an oxidation-reduction reaction. Meanwhile, after a resistor with a specific resistance value is connected between the cathode and the anode of the sensor, current passes through the resistor to form a current loop, voltage is generated at two ends of the resistor, and the voltage value is in direct proportion to the dissolved oxygen concentration.
However, because the sensor consumes electrolyte and lead during measurement and cannot be stored to avoid contact with oxygen, oxygen molecules enter the sensor, so that the redox reaction in the sensor is not carried out all the time. The amount of lead and electrolyte inside the sensor is limited, so that the longer the sensor is stored, the more lead and electrolyte are consumed inside the sensor, and the shorter the sensor life. The sensor is usually stored for a period of time after being manufactured and sold or the sensor is possibly stored for a period of time when being purchased by a customer and used, so that the service life of the sensor is possibly shorter than the designed service life, and the use experience of the user is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a novel dissolved oxygen sensor to overcome the defect of the prior art that the service life is reduced due to the inside oxidation-reduction reaction when the sensor is stored.
The utility model provides a following technical scheme: a novel dissolved oxygen sensor comprises a sensor shell, electrolyte, a cathode, an anode and a signal circuit board, wherein the electrolyte, the cathode, the anode and the signal circuit board are arranged in the sensor shell, the signal circuit board comprises a signal acquisition circuit, the cathode is led out through a wire to obtain a cathode wire, the anode is led out through another wire to obtain an anode wire, and the cathode wire and the anode wire are detachably connected with the signal acquisition circuit through wire terminals;
the signal acquisition circuit includes the amplifier and sets up resistance between amplifier positive, the inverting input, the one end of resistance pass through the line terminal with the positive pole wire is connected, the other end of resistance pass through the line terminal with the negative pole wire is connected.
Preferably, the amplifier is of the type LM 358.
Preferably, another resistor is further disposed between the inverting input terminal and the output terminal of the amplifier.
Preferably, one end of the resistor is grounded through a capacitor.
Preferably, the capacitor is a patch capacitor.
Preferably, the anode is a lead electrode.
Preferably, the cathode is a platinum electrode.
Preferably, the lead electrode has a larger volume than the platinum electrode.
By adopting the technical scheme, the method has the following advantages: when the novel dissolved oxygen sensor is stored, the connection between the electrode and the signal acquisition circuit is disconnected through the wire terminals, so that the cathode and the anode of the sensor are not conducted, the sensor cannot form a current loop, oxygen molecules entering the sensor cannot be reduced, an oxidation-reduction reaction is not generated, the electrode and electrolyte in the sensor are not consumed, and the defect of service life reduction caused by the oxidation-reduction reaction inside the sensor is overcome; during the use, only when the electrode inserts acquisition circuit, just can insert a resistance between sensor negative and positive pole, sensor negative and positive pole switches on, just can produce redox reaction, and the sensor just can produce corresponding signal of telecommunication this moment in order to be used for detecting.
Drawings
FIG. 1 is a schematic diagram of a dissolved oxygen sensor provided in the prior art;
fig. 2 is a schematic structural diagram of a novel dissolved oxygen sensor provided in an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a signal acquisition circuit according to an embodiment of the present invention.
Detailed Description
To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be made with reference to the accompanying drawings and specific embodiments, and the description herein does not mean that all the subject matters corresponding to the specific examples set forth in the embodiments are cited in the claims.
The structure of the existing dissolved oxygen sensor is shown in fig. 1, and comprises an electrolyte 200, an oxygen permeable membrane 201, a cathode 202, an anode 203, a cathode lead 204, an anode lead 205 and a resistor 206 between the cathode and the anode.
Referring to fig. 2 and 3, a novel dissolved oxygen sensor provided by an embodiment of the present invention includes a sensor housing, and an electrolyte 100, an oxygen permeable membrane 101, a cathode 102, an anode 103 and a signal circuit board (not shown in the figure) disposed in the sensor housing, wherein the signal circuit board includes a signal acquisition circuit, the cathode 102 is led out through a wire to obtain a cathode lead 104, the anode 103 is led out through another wire to obtain an anode lead 105, and the cathode lead and the anode lead are detachably connected to the signal acquisition circuit through wire terminals;
the signal acquisition circuit comprises an amplifier and a resistor arranged between a positive input end and a negative input end of the amplifier, one end of the resistor is connected with the anode wire through a wire terminal, and the other end of the resistor is connected with the cathode wire through a wire terminal; the wire terminals can adopt a plug-in mode of a male end and a female end.
In the above scheme, after improvement, only after the wires of the cathode and the anode of the sensor electrode are connected to the D0+ and the GND of the signal acquisition circuit, a current loop is formed, and the redox reaction is generated in the sensor, so that the service life of the electrode can be effectively prolonged.
Specifically, the amplifier is of a model LM 358; one end of the resistor is also grounded through a capacitor.
In practice, the detailed connection relationship is as follows: the signal acquisition circuit comprises an amplifier, a capacitor C1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the positive phase input end of the amplifier is grounded after sequentially passing through the resistor R1 and the capacitor C1, the positive phase input end of the amplifier is connected with the anode lead, the negative phase input end of the amplifier is connected with the cathode lead through the resistor R2, the resistor R3 is arranged between the positive phase input end of the amplifier and the negative phase input end of the amplifier, and the resistor R4 is arranged between the output end of the amplifier and the negative phase input end of the amplifier.
Specifically, the capacitor is a patch capacitor;
the anode adopts a lead electrode;
the cathode adopts a platinum electrode;
the volume of the lead electrode is larger than that of the platinum electrode;
according to the technical scheme, when the sensor is stored, the connection between the electrode and the signal acquisition circuit is disconnected through the wire terminal, so that the cathode and the anode of the sensor are not conducted, the sensor cannot form a current loop, oxygen molecules entering the sensor cannot be reduced, oxidation-reduction reaction is not generated, the electrode and electrolyte in the sensor are not consumed, and the defect of reduction of service life caused by oxidation-reduction reaction inside the sensor is overcome; during the use, only when the electrode inserts acquisition circuit, just can insert a resistance between sensor negative and positive pole, sensor negative and positive pole switches on, just can produce redox reaction, and the sensor just can produce corresponding signal of telecommunication this moment in order to be used for detecting.
Finally, it should be noted that the above description is a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (8)
1. A novel dissolved oxygen sensor comprises a sensor shell, electrolyte, a cathode, an anode and a signal circuit board, wherein the electrolyte, the cathode, the anode and the signal circuit board are arranged in the sensor shell, and the signal circuit board comprises a signal acquisition circuit;
the signal acquisition circuit includes the amplifier and sets up resistance between amplifier positive, the inverting input, the one end of resistance pass through the line terminal with the positive pole wire is connected, the other end of resistance pass through the line terminal with the negative pole wire is connected.
2. The novel dissolved oxygen sensor as claimed in claim 1, wherein the amplifier is of type LM 358.
3. The novel dissolved oxygen sensor as claimed in claim 2, wherein another resistor is provided between the inverting input terminal and the output terminal of the amplifier.
4. The novel dissolved oxygen sensor as claimed in any one of claims 1 to 3, wherein one end of the resistor is further grounded through a capacitor.
5. The novel dissolved oxygen sensor as claimed in claim 4, wherein the capacitor is a patch capacitor.
6. The novel dissolved oxygen sensor as claimed in claim 5, wherein the anode is lead electrode.
7. The novel dissolved oxygen sensor as claimed in claim 6, wherein the cathode is a platinum electrode.
8. The novel dissolved oxygen sensor of claim 7 wherein the lead electrode is larger in volume than the platinum electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121177495.7U CN215297229U (en) | 2021-05-28 | 2021-05-28 | Novel dissolved oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121177495.7U CN215297229U (en) | 2021-05-28 | 2021-05-28 | Novel dissolved oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215297229U true CN215297229U (en) | 2021-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121177495.7U Active CN215297229U (en) | 2021-05-28 | 2021-05-28 | Novel dissolved oxygen sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN215297229U (en) |
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2021
- 2021-05-28 CN CN202121177495.7U patent/CN215297229U/en active Active
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