CN214334763U

CN214334763U - Oxygen sensor

Info

Publication number: CN214334763U
Application number: CN202022945962.8U
Authority: CN
Inventors: 蒋钢健; 岑坚维
Original assignee: SHENZHEN ENVISEN INDUSTRY CO LTD
Current assignee: SHENZHEN ENVISEN INDUSTRY CO LTD
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-10-01
Anticipated expiration: 2030-12-10

Abstract

The utility model is suitable for a medical sensor technical field provides an oxygen sensor, including the sensor main part that has the reaction chamber, set up the electrode group in the reaction chamber, and set up the control module in the sensor main part, be equipped with the air inlet of intercommunication reaction chamber and exterior space in the sensor main part, and be used for the filter assembly of shutoff air inlet, still include baroceptor and the gas-supply pipe of setting in the sensor main part, baroceptor passes through the gas-supply pipe and communicates with the air inlet, be used for detecting the atmospheric pressure of air inlet, control module is connected with baroceptor and electrode group electricity, be used for receiving detection data between them and adjust output signal's intensity according to atmospheric pressure; the sensor main body is also provided with a temperature sensor electrically connected with the control module. The utility model provides an oxygen sensor output signal intensity is stable.

Description

Oxygen sensor

Technical Field

The utility model belongs to the technical field of medical sensor, especially, relate to an oxygen sensor.

Background

Oxygen sensors, also known as oxygen cells, oxygen concentration sensors, oxygen probes, and the like. The oxygen sensor is only used for final monitoring in a breathing machine, is generally arranged between the inspiration end of a patient and an air-oxygen mixer, adopts the electrochemical principle and is mainly used for measuring the oxygen concentration of mixed gas. There are two types of oxygen sensors that can be used in a ventilator: one is a consumption type oxygen sensor (also called a chemical oxygen sensor) and the other is a permanent type oxygen sensor (such as an ultrasonic type oxygen sensor). Wherein the working principle of the consumption type oxygen sensor is similar to that of a dry battery.

In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art: when the consumption type oxygen sensor is used, the oxygen intake quantity influences the signal output strength of the oxygen concentration, and the size of the oxygen intake quantity is related to the external air pressure. The specific expression is that under the same environmental condition, the larger the external air pressure is, the stronger the output signal of the consumption type oxygen sensor is; the smaller the external air pressure is, the weaker the output signal of the consumption type oxygen sensor is. However, the current consumption type oxygen sensor does not consider the above factors, and the output signal intensity is unstable.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oxygen sensor aims at solving the unstable technical problem of consumption formula oxygen sensor output signal intensity among the prior art.

The utility model discloses a realize like this, an oxygen sensor, be in including sensor main part, the setting that has the reaction chamber electrode group and setting in the reaction chamber are in control module in the sensor main part, be equipped with the intercommunication in the sensor main part the air inlet of reaction chamber and exterior space, and be used for the shutoff the filtering component of air inlet, still including setting up baroceptor and gas-supply pipe in the sensor main part, baroceptor passes through the gas-supply pipe with the air inlet intercommunication, be used for detecting the atmospheric pressure of air inlet, control module with baroceptor with the equal electricity of electrode group is connected for receive detection data between them and adjust output signal's intensity according to atmospheric pressure.

Further, the sensor main body is further provided with a temperature sensor electrically connected with the control module, the temperature sensor is used for detecting the temperature of the working environment where the sensor main body is located, and the control module is used for receiving the detection data of the temperature sensor and analyzing the detection data to obtain the oxygen concentration compensated by temperature.

Furthermore, the control module and the air inlet are respectively arranged at two ends of the sensor main body; the oxygen sensor also comprises a gasket arranged at one end of the sensor main body, which is provided with the air inlet; the gasket is an annular gasket, a first through hole communicated with the air inlet and the external space is formed in the middle of the gasket, a second through hole penetrating through the side wall in the thickness direction is formed in the side wall of the gasket, and the air conveying pipe is communicated with the air inlet through the second through hole.

Further, the sensor main part is including being the shell subassembly of cylindric setting and inlaying and adorning in the electrode support subassembly in the shell subassembly, the electrode support subassembly is the hollow structure that one end was sealed, the open setting of the other end, and the inner chamber forms the reaction chamber, and open end forms the air inlet.

Furthermore, the gas transmission pipe is a hose and is positioned between the outer wall of the electrode support assembly and the inner wall of the shell assembly.

Furthermore, the electrode support assembly comprises a support body with two open ends and a blocking piece detachably arranged at one end of the support body, the filtering assembly is fixedly arranged at the other end of the support body, the filtering assembly, the blocking piece and the support body are connected in a sealing mode to enclose the reaction cavity, the control module and the gasket are respectively embedded at two ends of the support body, the control module is located on the outer side of the blocking piece, and the gasket is located on the outer side of the filtering assembly.

Further, the gasket is detachably mounted on the sensor main body, and the filter assembly is pressed on the air inlet through the gasket.

Further, the filter assembly comprises a breathable film and a wire mesh which are arranged in a stacked mode, and the wire mesh is located on the outer side of the breathable film.

Further, the control module comprises a circuit board and a first processor arranged on the circuit board, and the air pressure sensor is arranged on the circuit board and is electrically connected with the first processor through a signal adjusting circuit printed on the circuit board.

Furthermore, the control module further comprises a connector and a memory, wherein the connector and the memory are both arranged on the circuit board and are both electrically connected with the first processor, and the connector is used for being electrically connected with an external second processor.

The utility model discloses technical effect for prior art is: the utility model provides an oxygen sensor adds in the sensor main part and has established the baroceptor that is used for detecting air inlet atmospheric pressure for oxygen sensor still can carry out real-time supervision to the atmospheric pressure of air inlet when detecting oxygen concentration. Meanwhile, the control module can adjust the intensity of the output signal according to the air pressure, so that the intensity of the signal output by the control module is always in a reasonable range, and the stability of the intensity of the output signal of the oxygen sensor is further ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below 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 schematic top view of an oxygen sensor according to an embodiment of the present invention;

fig. 2 is a schematic bottom view of an oxygen sensor according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 1;

fig. 4 is an exploded schematic view of an oxygen sensor according to an embodiment of the present invention.

Description of reference numerals:

100. a sensor body; 110. a housing assembly; 111. an outer cylinder; 112. a middle cylinder; 113. a convex ring; 120. an electrode holder assembly; 121. a stent body; 122. a blocking member; 1221. a gasket; 1222. sealing the cover; 1223. a compression member; 123. a support frame; 200. an electrode group; 210. a cathode; 220. an anode; 300. a control module; 310. a circuit board; 320. a first processor; 330. a connector; 340. a memory; 400. a reaction chamber; 500. a filter assembly; 520. a gas permeable membrane; 530. a wire mesh; 600. an air pressure sensor; 700. a gas delivery pipe; 800. a temperature sensor; 900. a gasket; 910. a first through hole; 920. a second via.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1 to 4, in an embodiment of the present invention, an oxygen sensor is provided, which includes a sensor body 100 having a reaction chamber 400, an electrode assembly 200 disposed in the reaction chamber 400, and a control module 300 disposed on the sensor body 100. The sensor body 100 is provided with an air inlet for communicating the reaction chamber 400 with an external space, and a filter assembly 500 for blocking the air inlet. The oxygen sensor further includes a pressure sensor 600 and a gas delivery pipe 700 provided on the sensor body 100. The air pressure sensor 600 is communicated with the air inlet through the air delivery pipe 700 and is used for detecting the air pressure of the air inlet. The control module 300 is electrically connected to both the air pressure sensor 600 and the electrode set 200, and is configured to receive detection data of the air pressure sensor and the electrode set and adjust the intensity of the output signal according to the air pressure.

In this embodiment, the electrode assembly 200 includes a cathode 210 and an anode 220, where the cathode 210 may be a gold electrode, the anode 220 may be a lead electrode, and electrodes made of other materials may also be used as the cathode or the anode, which is not limited herein.

In use, the reaction chamber 400 is filled with electrolyte solution, and oxygen enters the reaction chamber 400 through the filter assembly 500 on the air inlet, contacts the cathode 210 in the electrode assembly 200 in the reaction chamber 400, and is reduced to release hydroxide ions: o is²+2H₂O+4e^-＝4OH^-. These hydrogensThe oxygen ions reach the anode 220 in the electrode assembly 200 through the electrolyte solution in the reaction chamber 400, and undergo an oxidation reaction (2Pb +4 OH) with the anode 220^-＝2PbO+2H₂O+4e^-) And generating corresponding metal oxide. The two reactions occur to generate an electric current, the magnitude of which is correspondingly dependent on the oxygen reaction rate, when a potential difference is generated between the two electrodes. When the oxygen concentration measuring device is used, a known resistor can be externally connected to measure the generated potential difference, and the control module 300 analyzes the generated potential difference by monitoring the potential difference to obtain the oxygen concentration. The steps are the same as the steps used by the existing consumption type oxygen sensor on the market.

Meanwhile, the air pressure sensor 600 monitors the air pressure of the air inlet and transmits the result to the control module 300 in real time. The control module 300 may receive the detection data of the electrode group 200 and the air pressure sensor 600 in real time, and output the output signal after adjusting the strength of the output signal according to the air pressure detection data. The specific operation may be a preset program in the control module 300, for example, when the air pressure sensor 600 detects that the air pressure value is lower than P₀When the pressure sensor 600 detects that the pressure value is higher than P, the control module 300 amplifies the intensity of the output signal by corresponding times and outputs the amplified signal₁Meanwhile, the control module 300 reduces the intensity of the output signal by a corresponding multiple and outputs the signal. The above operations can be implemented by setting a conventional program design or circuit design in the control module 300, which is the prior art and will not be described herein.

The embodiment of the utility model provides an oxygen sensor adds on sensor main part 100 and has established baroceptor 600 that is used for detecting air inlet atmospheric pressure for oxygen sensor still can carry out real-time supervision to the atmospheric pressure of air inlet when detecting oxygen concentration. Meanwhile, the control module 300 can adjust the intensity of the output signal according to the air pressure, so that the intensity of the signal output by the control module 300 is always in a reasonable range, and the stability of the intensity of the output signal of the oxygen sensor is further ensured.

Further, referring to fig. 3 and 4, the cathode 210 is located above the filter element 500 and is a gold wire mesh. The anode 220 is a lead electrode having a ring-shaped mesh structure.

In addition, oxygen sensors are also very sensitive to temperature. Generally, at temperatures above 25 ℃, the sensor readings are higher; below 25 deg.C, the readings are low. The temperature impact is typically 0.5% to 1.0% per degree celsius, depending on the manufacturer and sensor type. To avoid the influence of temperature on the data detected by the oxygen sensor, referring to fig. 1, in one embodiment, the sensor body 100 is further provided with a temperature sensor 800 electrically connected to the control module 300. The temperature sensor 800 is used to detect the temperature of the working environment in which the sensor body 100 is located. The control module 300 is configured to receive the detection data of the temperature sensor 800 and analyze the detection data to obtain the temperature compensated oxygen concentration.

When the oxygen concentration measuring device is used, the control module 300 can simultaneously receive detection data of the electrode group 200, the air pressure sensor 600 and the temperature sensor 800, analyze the detection data of the electrode group 200 to obtain an oxygen concentration test value, perform temperature compensation on the oxygen concentration test value through the detection data of the temperature sensor 800 to obtain an oxygen concentration output value, and then output a result after adjusting the strength of an output signal according to the detection data of the air pressure sensor 600.

Referring to fig. 3 and 4, in one embodiment, the control module 300 and the air inlet are respectively disposed at two ends of the sensor body 100. The oxygen sensor further includes a gasket 900 mounted on an end of the sensor body 100 where the air inlet is provided. The gasket 900 is an annular gasket, and a first through hole 910 communicating the air inlet and the external space is formed in the middle. The lateral wall of the gasket 900 is provided with a second through hole 920 penetrating through the lateral wall along the thickness direction, and the gas pipe 700 is communicated with the gas inlet through the second through hole 920.

Specifically, one end of the gas pipe 700 connected with the second through hole 920 can be inserted into the second through hole 920 for fixing. Alternatively, as shown in fig. 3 and 4, a connecting pipe communicated with the second through hole 920 is additionally disposed on the outer wall of the gasket 900, and then the gas pipe 700 is mounted on the connecting pipe. Thus, both ends of the gas transmission pipe 700 are fixed through corresponding parts, so that the position of the gas transmission pipe 700 is not changed due to the movement or use of the oxygen sensor, and the relative position stability of the gas transmission pipe 700 and the sensor main body 100 is ensured.

Referring to fig. 3 and 4, in one embodiment, the sensor body 100 includes a housing assembly 110 disposed in a cylindrical shape, and an electrode holder assembly 120 embedded in the housing assembly 110. The electrode holder assembly 120 has a hollow structure with one end closed and the other end open, the inner cavity forms a reaction chamber 400, and the open end forms an air inlet.

In this embodiment, the housing assembly 110 and the electrode holder assembly 120 may be made of different materials, for example, the housing assembly 110 may be made of stainless steel, the electrode holder assembly 120 may be made of plastic, or other materials according to the use requirement, which is not limited herein. The sensor body 100 adopts a split structure, which is convenient for maintenance and reduces the manufacturing cost of the sensor body 100.

Further, the housing assembly 110 includes an outer cylinder 111 and a middle cylinder 112 fitted in the outer cylinder 111. One end of the middle cylinder 112 extends to the outside of the outer cylinder 111, and a convex ring 113 which protrudes outwards and abuts against the corresponding end wall of the outer cylinder 111 is arranged on the extending end of the middle cylinder 112.

Referring to FIG. 3, in one embodiment, the gas delivery conduit 700 is a flexible tube that is positioned between the outer wall of the electrode holder assembly 120 and the inner wall of the housing assembly 110.

In this embodiment, the gas pipe 700 may be a rubber hose, a plastic hose, a metal hose, a corrugated hose, or the like, which may be specifically selected according to the use requirement, and is not limited herein. The gas delivery pipe 700 is a flexible pipe which can be bent arbitrarily according to the shape of the space between the electrode holder assembly 120 and the housing assembly 110, thereby facilitating the installation of the gas delivery pipe 700 and the overall assembly of the oxygen sensor. The gas pipe 700 is positioned between the outer wall of the electrode support assembly 120 and the inner wall of the housing assembly 110, so that the appearance of the oxygen sensor is neat, and meanwhile, the risk of abrasion of the gas pipe 700 in the use process is effectively reduced.

Referring to fig. 3, in one embodiment, the electrode holder assembly 120 includes a holder body 121 with two open ends, and a blocking member 122 detachably disposed at one end of the holder body 121. The filter assembly 500 is fixedly installed on the other end of the bracket body 121. The filter assembly 500, the plugging member 122 and the bracket body 121 are hermetically connected to enclose the reaction chamber 400. The control module 300 and the gasket 900 are respectively fitted to both ends of the holder body 121. The control module 300 is located on the outside of the closure 122 and the gasket 900 is located on the outside of the filter assembly 500.

The electrode holder assembly 120 adopts the above-mentioned split type structure, which is convenient for maintenance. Specifically, the sealing member 122 and the filter assembly 500 may be connected to the bracket body 121 in a sealing manner by a sealing structure or a peripheral sealing structure. The sealing structure can be a sealing gasket, a sealing glue or a sealing clamping structure and the like. Wherein, the sealing gasket can adopt a silica gel ring, a rubber ring and the like, and is not limited uniquely here.

Further, the blocking member 122 includes a sealing gasket 1221, a cover 1222, and a pressing member 1223, which are sequentially disposed from inside to outside. Wherein, the compressing piece 1223 is detachably connected with the bracket body 121, and the cover 1222 can be a transparent soft rubber pad. In particular, the pressing member 1223 may be an annular gasket.

Preferably, the electrode holder assembly 120 further comprises a support frame 123 disposed in the reaction chamber 400 for supporting the anode 220, wherein the support frame 123 has a through hole for passing the electrolyte.

Referring to fig. 3, in one embodiment, the spacer 900 is detachably mounted to the sensor body 100. The filter assembly 500 is pressed onto the air inlet by the gasket 900.

The spacer 900 may be detachably mounted to the sensor body 100 by bolts, snap structures, or the like. The filter assembly 500 is pressed on the air inlet through the gasket 900, so that other parts are not needed for installation, the number of parts of the oxygen sensor is effectively reduced, and the assembly and maintenance are convenient. With the above-described structure, when the electrolyte solution is added to the reaction chamber 400, the gasket 900 and the filter assembly 500 may be removed to pour the electrolyte solution into the reaction chamber 400 through the air inlet.

Referring to FIG. 4, in one embodiment, the filter assembly 500 includes a gas permeable membrane 520 and a wire mesh 530 stacked together, wherein the wire mesh 530 is disposed outside the gas permeable membrane 520.

In this embodiment, the gas permeable membrane 520 may be a PTFE membrane, or other gas permeable membrane 520 that allows only gas to pass through without allowing electrolyte solution to flow out, which is not limited herein. The wire mesh 530 may be a stainless steel wire mesh or a wire mesh made of other materials with filtering effect. The arrangement of the wire mesh 530 not only increases the stability of the whole structure of the filtering assembly 500, but also plays a certain role in filtering, and prevents impurities from entering the reaction chamber 400 to influence the normal use of the oxygen sensor.

Referring to fig. 1, in one embodiment, the control module 300 includes a circuit board 310 and a first processor 320 disposed on the circuit board 310, and the air pressure sensor 600 is disposed on the circuit board 310 and electrically connected to the first processor 320 through a signal conditioning circuit printed on the circuit board 310.

In this embodiment, the circuit board 310 may be a PCB board with a circuit printed on the surface. The number of the circuit boards 310 may be one or more, and is set according to the requirement, and is not limited herein. Both the air pressure sensor 600 and the temperature sensor 800 may be electrically connected to the first processor 320 through circuitry printed on the circuit board 310. The electrode set 200 may be directly electrically connected to the first processor 320, or may be electrically connected to a data receiving module disposed on the circuit board 310, and then electrically connected to the first processor 320 through the data receiving module. Since the output signal of the air pressure sensor 600 is generally weak, in order to ensure smooth transmission of the signal, the output signal of the air pressure sensor 600 may be transmitted to the first processor 320 through the signal conditioning circuit. The signal conditioning circuit referred to herein may be an amplification conditioning circuit.

The first processor 320 may be a programmable controller or the like, and is configured to analyze the detected data of the electrode assembly 200 to obtain the oxygen concentration, adjust the intensity of the output signal according to the detected data of the pressure sensor 600, and modify the oxygen concentration value measured by the electrode assembly 200 according to the detected data of the temperature sensor 800. These functions can be realized by presetting corresponding programs in the first processor 320, and the presetting of corresponding programs in the controller according to use needs is prior art. Specifically, the output signal of the first processor 320 may be output as a digital signal through an interface circuit, or output as a standardized analog signal, which is convenient for an external device to read.

Referring to fig. 1, in an embodiment, the control module 300 further includes a connector 330 and a memory 340, the connector 330 and the memory 340 are disposed on the circuit board 310 and electrically connected to the first processor 320, and the connector 330 is used for electrically connecting to an external second processor.

The connector 330 and the memory 340 in this embodiment may be a conventional connector 330 and memory 340 that are available on the market. The connector 330 is provided to facilitate the first processor 320 to transfer data to an external second processor. The memory 340 is arranged to facilitate storing data. The second processor can be a computer, a cloud, a mobile phone, a ventilator controller, etc. Specifically, the memory 340 may store the oxygen concentration, the detection data of the electrode group 200, the detection data of the pressure sensor 600, and the detection data of the temperature sensor 800, which are obtained by the analysis of the first processor 320, so as to facilitate later retrieval by an operator; in addition, the relevant calibration parameters of the oxygen sensor can be stored, so that the first processor 320 can conveniently fetch the detection data of the electrode group 200 as required when analyzing the detection data, and the accuracy of the output result of the oxygen sensor can be ensured.

The foregoing is only a preferred embodiment of the present invention, and the technical principles of the present invention have been specifically described, and the description is only for the purpose of explaining the principles of the present invention, and should not be construed as limiting the scope of the present invention in any way. Any modifications, equivalents and improvements made within the spirit and principles of the invention and other embodiments of the invention without the creative effort of those skilled in the art are intended to be included within the protection scope of the invention.

Claims

1. Oxygen sensor, be in including sensor main part, the setting that has the reaction chamber electrode group and setting in the reaction chamber are in control module in the sensor main part, be equipped with the intercommunication in the sensor main part the air inlet of reaction chamber and exterior space, and be used for the shutoff the filtering component of air inlet, its characterized in that, still including setting up baroceptor and gas-supply pipe in the sensor main part, baroceptor passes through the gas-supply pipe with the air inlet intercommunication, be used for detecting the atmospheric pressure of air inlet, control module with baroceptor with the equal electricity of electrode group is connected for receive detection data between them and adjust output signal's intensity according to atmospheric pressure.

2. The oxygen sensor according to claim 1, wherein the sensor body is further provided with a temperature sensor electrically connected to the control module, the temperature sensor is configured to detect a temperature of an operating environment in which the sensor body is located, and the control module is configured to receive detection data of the temperature sensor and analyze the detection data to obtain a temperature-compensated oxygen concentration.

3. The oxygen sensor of claim 1, wherein the control module and the air inlet are disposed at opposite ends of the sensor body; the oxygen sensor also comprises a gasket arranged at one end of the sensor main body, which is provided with the air inlet; the gasket is an annular gasket, a first through hole communicated with the air inlet and the external space is formed in the middle of the gasket, a second through hole penetrating through the side wall in the thickness direction is formed in the side wall of the gasket, and the air conveying pipe is communicated with the air inlet through the second through hole.

4. The oxygen sensor according to claim 3, wherein the sensor body comprises a housing assembly arranged in a cylindrical shape, and an electrode holder assembly embedded in the housing assembly, the electrode holder assembly is a hollow structure with one end closed and the other end open, an inner cavity forms the reaction cavity, and an open end forms the air inlet.

5. The oxygen sensor of claim 4 wherein the gas delivery conduit is a hose positioned between an outer wall of the electrode support assembly and an inner wall of the housing assembly.

6. The oxygen sensor according to claim 4, wherein the electrode holder assembly comprises a holder body with two open ends and a blocking member detachably disposed at one end of the holder body, the filter assembly is fixedly mounted at the other end of the holder body, the filter assembly, the blocking member and the holder body are hermetically connected to define the reaction chamber, the control module and the gasket are respectively embedded at two ends of the holder body, the control module is located at an outer side of the blocking member, and the gasket is located at an outer side of the filter assembly.

7. The oxygen sensor according to any one of claims 3 to 6, wherein the gasket is detachably mounted to the sensor body, and the filter assembly is pressed against the air inlet via the gasket.

8. The oxygen sensor according to any one of claims 1 to 6, wherein the filter assembly comprises a gas permeable membrane and a wire mesh arranged in a stack, the wire mesh being located on an outer side of the gas permeable membrane.

9. The oxygen sensor of any one of claims 1-6, wherein the control module comprises a circuit board, and a first processor disposed on the circuit board, wherein the pressure sensor is disposed on the circuit board and is electrically connected to the first processor via signal conditioning circuitry printed on the circuit board.

10. The oxygen sensor of claim 9, wherein the control module further comprises a connector and a memory, the connector and the memory both disposed on the circuit board and both electrically connected to the first processor, the connector for electrically connecting to an external second processor.