CO electrochemical gas sensor upper cover capable of reducing NO cross response

Abstract

The utility model relates to a CO electrochemical gas sensor upper cover capable of reducing NO cross response. The upper cover comprises a cover body, a first groove is formed in the bottom face of the cover body, an air inlet communicated with the first groove is formed in the cover body, and the depth of the first groove is 0.5-1.2 mm. According to the CO electrochemical gas sensor, the response signal of NO on the working electrode of the CO electrochemical gas sensor is reduced by optimizing the depth of the groove of the upper cover, so that the CO gas detection precision of the CO electrochemical gas sensor is improved, when the depth of the first groove is between 0.5 mm and 1.2 mm, the cross response of NO is small, and the CO concentration detection precision of the CO electrochemical gas sensor can be improved.

Description

Technical Field

[0001] The utility model relates to the field of gas sensors, in particular to a CO electrochemical gas sensor upper cover capable of reducing NO cross response. Background Art

[0002] With the rapid development of modern industry and technology, gas sensors have been widely used in fields such as environmental monitoring, industrial safety, and healthcare. This is primarily due to the advantages of electrochemical gas sensors, such as their wide range of detection options, compact size, high sensitivity, rapid response, and low cost. Improving the performance of electrochemical gas sensors is a major concern. Reducing or even eliminating the impact of interfering gases on target gas measurements, thereby improving measurement accuracy, is the future development direction of electrochemical gas sensor research and development.

[0003] In a gas environment containing NO (nitric oxide) and CO (carbon monoxide), NO and CO have similar reaction mechanisms on electrochemical gas sensors, resulting in a cross-response from NO to CO electrochemical gas sensors, which affects the accurate detection of CO concentration. Therefore, designing a CO electrochemical gas sensor that can reduce NO cross-response is of great significance for improving the performance and application range of the sensor.

[0004] The design of the top cover of traditional CO electrochemical gas sensors ignores the problem of NO cross-response. The purpose of this utility model is to provide a CO electrochemical gas sensor top cover design that can reduce NO cross-response. This design reduces the NO response signal at the sensor working electrode by optimizing the depth of the top cover groove, thereby improving the sensor's CO detection accuracy. Utility Model Content

[0005] The utility model aims to provide a CO electrochemical gas sensor upper cover capable of reducing NO cross response, so as to solve the problem that the NO cross response is ignored in the design of the upper cover of the existing CO electrochemical gas sensor.

[0006] To achieve the above objectives, the present invention adopts a CO electrochemical gas sensor cover capable of reducing NO cross response, which adopts the following technical solution: a CO electrochemical gas sensor cover capable of reducing NO cross response, comprising a cover body, a first groove being provided on the bottom surface of the cover body, and an air inlet hole connected to the first groove being provided on the cover body, wherein the depth of the first groove is 0.5-1.2 mm.

[0007] The depth of the first groove is 0.8 mm.

[0008] A carbon cloth layer is placed in the first groove.

[0009] The thickness of the carbon cloth layer is 0.35 mm.

[0010] A second groove is provided on the top surface of the cover body for placing a dustproof film.

[0011] The beneficial effects of the present invention are as follows: the present application reduces the response signal of NO at the working electrode of the CO electrochemical gas sensor by optimizing the depth of the groove of the upper cover, thereby improving the detection accuracy of the CO electrochemical gas sensor for CO gas. When the depth of the first groove is between 0.5 mm and 1.2 mm, the cross-response of NO is small, which can improve the detection accuracy of the CO electrochemical gas sensor for CO concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of an embodiment of a CO electrochemical gas sensor cover capable of reducing NO cross-response according to the present invention;

[0013] Figure 2 yes Figure 1 Schematic diagram of the internal structure;

[0014] Figure 3 1 is a graph showing the response of the CO electrochemical gas sensor to NO with different first groove depths. DETAILED DESCRIPTION

[0015] To facilitate understanding of the present invention, the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0016] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0017] An embodiment of a CO electrochemical gas sensor cover capable of reducing NO cross-response in the present utility model is as follows: Figure 1-Figure 2As shown, a CO electrochemical gas sensor cover capable of reducing NO cross-response is provided, including a cover body 1, a first groove 2 is provided on the bottom surface of the cover body, a second groove 4 is provided on the top surface of the cover body for placing a dustproof film, and an air inlet 3 connecting the first groove and the second groove is provided on the cover body. The depth of the first groove 2 is 0.5-1.2mm, and preferably, the depth of the first groove is 0.8mm. A carbon cloth layer is placed in the first groove, and the thickness of the carbon cloth layer is 0.35mm. The function of the carbon cloth layer is to reduce the interference of other gases, such as hydrogen sulfide gas. The carbon cloth layer is a prior art, and the composition and working principle of the carbon cloth will not be described in detail in this embodiment.

[0018] The design of the depth of the first groove on the upper cover is crucial in this application. Research has shown that the depth of the first groove on the upper cover is closely related to factors such as sensor sensitivity, response time, gas diffusion rate, and NO cross-response. Through in-depth research and experimental verification, the present invention has determined the optimal depth range for the upper cover to be 0.8mm, effectively reducing NO cross-response while maintaining high sensor sensitivity and fast response.

[0019] Two CO electrochemical gas sensors with first groove depths of 1.2mm, 0.8mm and 0.5mm were selected, and the only difference was the depth of the first groove. The rest of the sensors were the same. The NO cross response test was performed. The test results are as follows: Figure 3 As shown, when the first groove depth is 1.2 mm, the NO cross-response is the largest. This is likely because the deeper diffusion channel allows more NO gas to enter, resulting in a reaction with the sensor electrodes, resulting in a larger cross-response. The response value gradually increases over time. This is because the NO₂ gas produced by the NO reaction at the working electrode diffuses well due to the groove depth, resulting in a higher response value. When the first groove depth is 0.8 mm, the NO cross-response is smaller. This suggests that appropriately reducing the diffusion channel depth can limit the entry of NO gas, reducing its probability of reaction with the electrode, thereby reducing the NO cross-response. The response value gradually decreases over time. This is because the NO₂ gas produced by the NO reaction at the working electrode cannot diffuse well due to the shallower groove depth, thus affecting the NO reaction at the working electrode. When the first groove depth is 0.5 mm, the NO cross-response is similar to that when the carbon cloth cover groove depth is 0.8 mm. However, the CO response time is longer, which is likely related to the fact that the shallow cover groove depth compresses the carbon cloth, slowing gas diffusion.

[0020] In the above description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0021] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0022] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0023] In other embodiments of the present invention, the depth of the first groove may also be 0.6 mm, 0.7 mm or 0.4 mm; and the second groove may not be provided on the cover without affecting usage.

Claims

1. A CO electrochemical gas sensor cover capable of reducing NO cross-response, comprising a cover body, a first groove provided on the bottom surface of the cover body, and an air inlet provided on the cover body in communication with the first groove, characterized in that: The depth of the first groove is 0.5-1.2 mm.

2. The CO electrochemical gas sensor cover capable of reducing NO cross-response according to claim 1, characterized in that: The depth of the first groove is 0.8 mm.

3. The CO electrochemical gas sensor cover capable of reducing NO cross-response according to claim 1 or 2, characterized in that: A carbon cloth layer is placed in the first groove.

4. The CO electrochemical gas sensor cover capable of reducing NO cross-response according to claim 3, characterized in that: The thickness of the carbon cloth layer is 0.35 mm.

5. The CO electrochemical gas sensor cover capable of reducing NO cross-response according to claim 1, characterized in that: A second groove is provided on the top surface of the cover body for placing a dustproof film.

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