Test fixture for simulating the output of an ambient gas monitoring sensor

Abstract

The utility model relates to test equipment technical field, concretely discloses a kind of test tool of simulated environment gas monitoring sensor signal output, including input module, signal processing module and signal output interface, input module provides input interface, so that user inputs gas type selection signal and gas concentration analog numerical value signal by input interface, signal processing module receives gas type selection signal and gas concentration analog numerical value signal, gas type selection signal and gas concentration analog numerical value signal are converted into corresponding analog sensor signal, signal output interface passes through signal transmission line and is transmitted to the analog sensor signal to be measured range hood, so that the corresponding test action is executed when being measured range hood receives analog sensor signal;With this, the signal output of simulated gas monitoring sensor and range hood are communicated, simulate different environmental conditions, so that the different test conditions of simulated gas monitoring sensor are simulated, the comprehensiveness and easy operability of test are ensured.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a testing fixture for simulating the signal output of an environmental gas monitoring sensor. Background Technology

[0002] Gas monitoring sensors are crucial electronic components in range hoods, primarily used to detect the concentration of harmful gases (such as carbon monoxide and nitrogen oxides). When the concentration exceeds a preset value, they trigger an alarm or automatically adjust the fan speed.

[0003] In the software functional testing process, testing the functions of gas monitoring sensors often requires simulating real environmental conditions to bring the sensors to the test conditions. However, it is difficult to achieve suitable environmental conditions in practice, which makes it difficult to test the functions of gas monitoring sensors. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, the purpose of this utility model is to propose a test fixture for simulating the signal output of an environmental gas monitoring sensor. According to this test fixture, the signal output of the simulated gas monitoring sensor can communicate with the range hood, simulating different environmental conditions, thereby simulating different test conditions of the gas monitoring sensor, achieving controllable output values ​​to the range hood, and ensuring the comprehensiveness and ease of operation of the test.

[0006] To achieve the above objectives, embodiments of this utility model propose a test fixture for simulating the signal output of an environmental gas monitoring sensor, comprising: an input module for providing an input interface so that a user can input a gas type selection signal and a simulated gas concentration value signal through the input interface; a signal processing module electrically connected to the input module, the signal processing module being used to receive the gas type selection signal and the simulated gas concentration value signal, and convert the gas type selection signal and the simulated gas concentration value signal into corresponding simulated sensor signals; and a signal output interface electrically connected to the signal processing module and connected to the corresponding interface of the range hood under test through a signal transmission line, the signal output interface being used to transmit the simulated sensor signal to the range hood under test through the signal transmission line so that the range hood under test can perform corresponding test actions upon receiving the simulated sensor signal.

[0007] The test fixture for the simulated environmental gas monitoring sensor signal output according to an embodiment of this utility model includes an input module, a signal processing module, and a signal output interface. The input module provides an input interface for users to input gas type selection signals and simulated gas concentration values. The signal processing module receives the gas type selection signals and simulated gas concentration values, converting them into corresponding simulated sensor signals. The signal output interface transmits the simulated sensor signals to the range hood under test via a signal transmission line, enabling the range hood to perform corresponding test actions upon receiving the simulated sensor signals. By communicating with the range hood through the signal output of the simulated gas monitoring sensor, different environmental conditions can be simulated, thus simulating different test conditions for the gas monitoring sensor. This achieves controllable output values ​​to the range hood, ensuring comprehensive testing and ease of operation.

[0008] In some embodiments, the test fixture for simulating the signal output of the environmental gas monitoring sensor further includes: a display screen electrically connected to the input module, the display screen being used to receive the gas type selection signal and the gas concentration analog value signal, and to convert the gas type selection signal and the gas concentration analog value signal into corresponding display content for display.

[0009] In some embodiments, the input module includes a touch unit and / or a button unit, wherein the touch unit includes at least one virtual button, and the button unit includes at least one physical button.

[0010] In some embodiments, the key unit includes: numeric keys for inputting simulated gas concentration values; a toggle key for selecting different gas types; a function confirmation key for confirming the input of the simulated gas concentration value and the input of the gas type, thereby triggering the output of the simulated gas concentration value signal and the output of the gas type selection signal; and a clear key for resetting the input simulated gas concentration value to zero.

[0011] In some embodiments, the switching keys include a previous page key and a next page key for selecting different gas types.

[0012] In some embodiments, the analog sensor signal includes a gas concentration numerical signal and a gas type signal; the signal output interface includes: a type signal interface for transmitting the gas type signal; and a numerical signal interface for transmitting the gas concentration numerical signal.

[0013] In some embodiments, the number of type signal interfaces may include one or more, and each type signal interface corresponds to the output of a gas type signal.

[0014] In some embodiments, the test fixture for the simulated environmental gas monitoring sensor signal output further includes: a power interface for connecting an external power source to power the test fixture for the simulated environmental gas monitoring sensor signal output.

[0015] In some embodiments, the test fixture for the simulated environmental gas monitoring sensor signal output further includes a power supply module for supplying power to the test fixture for the simulated environmental gas monitoring sensor signal output.

[0016] In some embodiments, the input module can input multiple gas type selection signals.

[0017] In some embodiments, the multiple gas type selection signals include at least one of PM2.5 gas type selection signal, carbon monoxide gas type selection signal, and methane gas type selection signal.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a test fixture for simulating the signal output of an ambient gas monitoring sensor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a test fixture for simulating the signal output of an ambient gas monitoring sensor according to another embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a button unit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a test fixture for simulating the signal output of an environmental gas monitoring sensor according to another embodiment of the present invention.

[0020] Figure label: 100 - Test fixture for the signal output of the simulated ambient gas monitoring sensor; 110 - Input module; 111 - Touch unit; 112 - Button unit; 120 - Signal processing module; 130 - Signal output interface; 140 - Display screen; 150 - Power interface; 1121 - Numeric keypad; 1122 - Switch key; 1123 - Function confirmation key; 1124 - Clear key; 1131 - Type signal interface; 1132 - Numeric signal interface. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0022] The following is for reference. Figures 1-4 This invention describes a test fixture for the signal output of a simulated environmental gas monitoring sensor according to an embodiment of the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of a test fixture for simulating the signal output of a gas monitoring sensor in an environment according to an embodiment of the present invention. Figure 1 As shown, in one embodiment of this utility model, the test fixture for the signal output of the simulated environmental gas monitoring sensor includes: an input module 110, which provides an input interface so that a user can input a gas type selection signal and a simulated gas concentration value signal through the input interface; a signal processing module 120, which is electrically connected to the input module 110, and is used to receive the gas type selection signal and the simulated gas concentration value signal, and convert the gas type selection signal and the simulated gas concentration value signal into corresponding simulated sensor signals; and a signal output interface 130, which is electrically connected to the signal processing module 120 and is connected to the corresponding interface of the range hood under test through a signal transmission line, and is used to transmit the simulated sensor signal to the range hood under test through the signal transmission line so that the range hood under test can perform corresponding test actions when it receives the simulated sensor signal.

[0024] In a specific embodiment, the input module 110 includes an input interface through which the user can select the gas type and input simulated gas concentration values. Specifically, the input interface may include, but is not limited to, buttons, touch screens, etc., and the selectable gas types may include, but are not limited to, PM2.5, carbon monoxide, methane, etc.

[0025] In a specific embodiment, the signal processing module 120 receives a gas type selection signal and a simulated gas concentration signal, and converts the gas type selection signal and the simulated gas concentration signal into corresponding simulated sensor signals. Specifically, the simulated sensor signals of the signal processing module 120 simulate the monitoring signals output by a real gas monitoring sensor.

[0026] In a specific embodiment, the signal output interface 130 transmits the analog sensor signal to the range hood under test via a signal transmission line, so that the range hood under test can perform corresponding test actions upon receiving the analog sensor signal. Specifically, the signal output interface 130 includes, for example, a numerical interface and multiple type interfaces, thereby simulating the output of various types of gases. Test actions include, but are not limited to, turning the fan on and off, and adjusting the fan speed.

[0027] Specifically, the test fixture 100 for simulating the signal output of a gas monitoring sensor according to the embodiment of this utility model includes an input module 110, a signal processing module 120, and a signal output interface 130. The input module 110 provides an input interface for users to input gas type selection signals and simulated gas concentration signals. The signal processing module 120 receives the gas type selection signals and simulated gas concentration signals and converts them into corresponding simulated sensor signals. The signal output interface 130 transmits the simulated sensor signals to the range hood under test via a signal transmission line, so that the range hood under test can perform corresponding test actions upon receiving the simulated sensor signals. In this way, communication between the simulated gas monitoring sensor signal output and the range hood can be achieved, simulating different environmental conditions and thus different test conditions of the gas monitoring sensor. This allows for controllable output of values ​​to the range hood, ensuring the comprehensiveness and ease of operation of the test.

[0028] Figure 2 This is a schematic diagram of the test fixture for simulating the signal output of an environmental gas monitoring sensor according to another embodiment of the present invention. Figure 2 As shown, in one embodiment of this utility model, the test fixture 100 for simulating the signal output of the environmental gas monitoring sensor further includes: a display screen 140, which is electrically connected to the input module 110. The display screen 140 is used to receive the gas type selection signal and the gas concentration analog value signal, and convert the gas type selection signal and the gas concentration analog value signal into corresponding display content for display.

[0029] In a specific embodiment, the display screen 140 receives a gas type selection signal and a gas concentration analog value signal, and converts the gas type selection signal and the gas concentration analog value signal into corresponding display content for display. Specifically, the display screen 140 is, for example, a liquid crystal display screen or a digital tube display screen.

[0030] Specifically, the test fixture 100, which simulates the output of the gas monitoring sensor signal provided in this embodiment of the present invention, receives the gas type selection signal and the gas concentration simulation value signal through the display screen 140, and converts the gas type selection signal and the gas concentration simulation value signal into corresponding display content for display; thereby facilitating the test personnel to understand the test gas type and gas concentration value in a timely manner, and thus understand the test process and effect.

[0031] In one embodiment of the present invention, the input module 110 includes a touch unit 111 and / or a button unit 112, wherein the touch unit 111 includes at least one virtual button, and the button unit 112 includes at least one button.

[0032] In specific embodiments, the input module 110 can use the touch unit 111 alone, the button unit 112 alone, or both the touch unit 111 and the button unit 112 simultaneously for input. Specifically, the touch unit 111 may include at least one virtual button, and the button unit 112 may include at least one physical button.

[0033] Specifically, according to the test fixture 100 for simulating environmental gas monitoring sensor signal output provided in this embodiment of the present invention, the input module 110 includes a touch unit 111 and / or a button unit 112, wherein the touch unit 111 includes at least one virtual button and the button unit 112 includes at least one button; thereby facilitating the test personnel to input gas type selection signals and simulated gas concentration numerical signals through the input module 110.

[0034] Figure 3 This is a schematic diagram of the structure of a button unit according to an embodiment of the present invention. Figure 3 As shown, in one embodiment of this utility model, the key unit 112 includes: a numeric key 1121 for inputting a simulated gas concentration value; a switch key 1122 for selecting different gas types; a function confirmation key 1123 for confirming the input of the simulated gas concentration value and the input of the gas type, so as to trigger the output of the simulated gas concentration value signal and the output of the gas type selection signal; and a clear key 1124 for resetting the input simulated gas concentration value to zero.

[0035] In a specific embodiment, the button unit 112 includes: a numeric keypad 1121, a toggle key 1122, a function confirmation key 1123, and a clear key 1124. Specifically, the numeric keypad 1121 is used to input a simulated gas concentration value, the toggle key 1122 is used to select different gas types, the function confirmation key 1123 is used to confirm the input of the simulated gas concentration value and the input of the gas type, thereby triggering the output of the simulated gas concentration value signal and the output of the gas type selection signal, and the clear key 1124 is used to reset the input simulated gas concentration value to zero. The numeric keypad 1121 may include, for example, ten keys from 0 to 9, and may also include a decimal point key.

[0036] Specifically, according to the test fixture 100 for the simulated environmental gas monitoring sensor signal output provided in this embodiment of the present invention, the button unit 112 includes: a numeric keypad 1121, a switch key 1122, a function confirmation key 1123, and a clear key 1124. The numeric keypad 1121 is used to input simulated gas concentration values, the switch key 1122 is used to select different gas types, the function confirmation key 1123 is used to confirm the input of the simulated gas concentration value and the input of the gas type, so as to trigger the output of the simulated gas concentration value signal and the output of the gas type selection signal, and the clear key 1124 is used to reset the input simulated gas concentration value to zero; thereby ensuring that the gas type selection signal and the simulated gas concentration value signal can be accurately input through the button unit 112.

[0037] In one embodiment of this utility model, the switch key 1122 includes a previous page key and a next page key, used to select different gas types.

[0038] Specifically, according to the test fixture 100 for the simulated environmental gas monitoring sensor signal output provided in this embodiment of the present invention, the switching key 1122 includes a previous page key and a next page key for selecting different gas types; thereby ensuring that the gas type selection signal can be accurately input through the switching key 1122.

[0039] In one embodiment of this utility model, the analog sensor signal includes a gas concentration numerical signal and a gas type signal; the signal output interface 130 includes: a type signal interface 1131 for transmitting the gas type signal; and a numerical signal interface 1132 for transmitting the gas concentration numerical signal.

[0040] In a specific embodiment, the analog sensor signal includes a gas concentration numerical signal and a gas type signal. The signal output interface 130 includes a type signal interface 1131 and a numerical signal interface 1132. Specifically, the type signal interface 1131 is used to transmit the gas type signal, and the numerical signal interface 1132 is used to transmit the gas concentration numerical signal. For example, there may be multiple type signal interfaces 1131, corresponding to the output of multiple different gas type signals. For example, there may be one numerical signal interface 1132, which simultaneously outputs gas concentration numerical signals corresponding to multiple different gas types.

[0041] Specifically, according to the test fixture 100 for simulating the output of a gas monitoring sensor signal provided in this embodiment of the present invention, the simulated sensor signal includes a gas concentration numerical signal and a gas type signal. The signal output interface 130 includes a type signal interface 1131 and a numerical signal interface 1132. The type signal interface 1131 is used to transmit the gas type signal, and the numerical signal interface 1132 is used to transmit the gas concentration numerical signal. Thus, the simulated sensor signal can be transmitted to the range hood under test through the signal output interface 130, so that the range hood under test can perform the corresponding test action when it receives the simulated sensor signal.

[0042] In one embodiment of this utility model, the number of type signal interfaces 1131 includes one or more, and each type signal interface 1131 outputs a gas type signal.

[0043] In specific embodiments, the number of type signal interfaces 1131 can be one or more, and each type signal interface 1131 corresponds to outputting a gas type signal. Specifically, for example, one type signal interface 1131 outputs a PM2.5 gas type signal, another type signal interface 1131 outputs a carbon monoxide gas type signal, and yet another type signal interface 1131 outputs a methane gas type signal, and so on.

[0044] Specifically, the test fixture 100 for the simulated environmental gas monitoring sensor signal output provided in this embodiment of the present invention includes one or more type signal interfaces 1131, each type signal interface 1131 corresponding to output a gas type signal; thus, multiple gas type signals can be output through multiple type signal interfaces 1131, which helps to test the effect under multiple gases simultaneously, and helps to improve test efficiency and comprehensiveness.

[0045] Figure 4 This is a schematic diagram of the test fixture for simulating the signal output of a gas monitoring sensor in a simulated environment, according to another embodiment of the present invention. Figure 4 As shown, in one embodiment of this utility model, the test fixture 100 for simulating the signal output of an environmental gas monitoring sensor further includes: a power interface 150 for connecting to an external power source to power the test fixture 100 for simulating the signal output of an environmental gas monitoring sensor.

[0046] In a specific embodiment, the test fixture 100 simulating the signal output of the environmental gas monitoring sensor is powered by an external power source connected to a power interface 150. Specifically, the external power source may include, but is not limited to, a portable power bank.

[0047] Specifically, the test fixture 100 for the simulated environmental gas monitoring sensor signal output provided in this embodiment of the present invention is powered by an external power supply connected to a power interface 150; thereby ensuring the normal power supply and normal operation of the test fixture 100 for the simulated environmental gas monitoring sensor signal output.

[0048] In one embodiment of the present invention, the test fixture 100 for simulating the signal output of an ambient gas monitoring sensor further includes a power supply module for supplying power to the test fixture 100 for simulating the signal output of an ambient gas monitoring sensor.

[0049] In a specific embodiment, the test fixture 100 simulating the signal output of the ambient gas monitoring sensor can also be directly powered by a built-in power module. Specifically, the power module includes, but is not limited to, a battery.

[0050] Specifically, the test fixture 100 for the simulated environmental gas monitoring sensor signal output provided according to the embodiment of this utility model can also be directly powered by a built-in power module; thereby further ensuring the normal power supply and normal operation of the test fixture 100 for the simulated environmental gas monitoring sensor signal output.

[0051] In one embodiment of this utility model, the input module 110 can input multiple gas type selection signals.

[0052] In a specific embodiment, the input module 110 can input multiple gas type selection signals. Specifically, the multiple gas types include, but are not limited to, PM2.5, carbon monoxide, and methane.

[0053] Specifically, the test fixture 100 for simulating environmental gas monitoring sensor signal output provided in this embodiment of the present invention allows the input module 110 to input multiple gas type selection signals, thereby ensuring the diversity and comprehensiveness of the test.

[0054] In one embodiment of this utility model, the multiple gas type selection signals include at least one of PM2.5 gas type selection signal, carbon monoxide gas type selection signal, and methane gas type selection signal.

[0055] Specifically, according to the test fixture 100 for the simulated environmental gas monitoring sensor signal output provided in this embodiment of the present invention, the input module 110 can input multiple gas type selection signals, including at least one of PM2.5 gas type selection signal, carbon monoxide gas type selection signal and methane gas type selection signal; thereby ensuring the diversity and comprehensiveness of the test.

[0056] The following describes the test fixture 100 for the simulated environmental gas monitoring sensor signal output of the present invention in conjunction with specific embodiments. In this specific embodiment, a test fixture for the simulated environmental gas monitoring sensor signal output is provided, which communicates with the range hood through the signal output of the simulated gas monitoring sensor to achieve controllable output values ​​to the range hood.

[0057] In this specific embodiment, the test fixture for the signal output of the simulated environmental gas monitoring sensor mainly consists of a computer board (i.e., the signal processing module 120 of the above embodiment of the present invention), a display screen (i.e., the display screen 140 of the above embodiment of the present invention), buttons (i.e., the input module 110 of the above embodiment of the present invention), and output signal lines. By inputting through the buttons, the value of a specific gas can be set. By switching through the buttons, the values ​​of multiple gases can also be set. The display screen shows the currently output gas type and value. The computer board communicates with the range hood through the signal lines.

[0058] In this specific embodiment, the keyboard includes number keys 0-9, a previous page key, a next page key, a clear key, and an confirm key.

[0059] In this specific embodiment, the method of using the test fixture for the signal output of the simulated environmental gas monitoring sensor includes: S1: Power the test fixture with 5V to the signal output of the simulated environmental gas monitoring sensor.

[0060] S2: When only one type of gas (PM2.5, carbon monoxide, methane, etc.) is simulated, two signal lines are led out and connected to the pre-reserved interface on the range hood switch board. For each additional type of gas to be simulated, one more signal line is added.

[0061] S3: By inputting the value of a specific gas through the keyboard, you can then press the confirmation key to communicate with the range hood; by using the switch key on the keyboard, you can set the values ​​of multiple gases, and by using the clear key, you can reset the set value to zero.

[0062] As can be seen in this specific embodiment, the test fixture for the signal output of the simulated environmental gas monitoring sensor communicates with the range hood through the signal output of the simulated gas monitoring sensor, so as to achieve controllable output values ​​to the range hood.

[0063] In summary, the test fixture 100 for the simulated environmental gas monitoring sensor signal output according to this embodiment of the present invention includes an input module 110, a signal processing module 120, and a signal output interface 130. The input module 110 provides an input interface for users to input gas type selection signals and simulated gas concentration values. The signal processing module 120 receives the gas type selection signals and simulated gas concentration values, converting them into corresponding simulated sensor signals. The signal output interface 130 transmits the simulated sensor signals to the range hood under test via a signal transmission line, enabling the range hood to perform corresponding test actions upon receiving the simulated sensor signals. By communicating with the range hood through the signal output of the simulated gas monitoring sensor, different environmental conditions can be simulated, thereby simulating different test conditions for the gas monitoring sensor and achieving controllable output values ​​to the range hood, ensuring the comprehensiveness and ease of operation of the test.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0065] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A test fixture for simulating the signal output of an environmental gas monitoring sensor, characterized in that, include: An input module is provided to allow users to input gas type selection signals and gas concentration analog numerical signals through the input interface. The signal processing module is electrically connected to the input module. The signal processing module is used to receive the gas type selection signal and the gas concentration analog numerical signal, and convert the gas type selection signal and the gas concentration analog numerical signal into corresponding analog sensor signals. The signal output interface is electrically connected to the signal processing module and connected to the corresponding interface of the range hood under test via a signal transmission line. The signal output interface is used to transmit the analog sensor signal to the range hood under test via the signal transmission line, so that the range hood under test can perform corresponding test actions when it receives the analog sensor signal.

2. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 1, characterized in that, Also includes: The display screen is electrically connected to the input module. The display screen is used to receive the gas type selection signal and the gas concentration analog value signal, and convert the gas type selection signal and the gas concentration analog value signal into corresponding display content for display.

3. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 1, characterized in that, The input module includes a touch unit and / or a button unit, wherein the touch unit includes at least one virtual button, and the button unit includes at least one physical button.

4. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 3, characterized in that, The button unit includes: Numeric keys are used to input simulated gas concentration values; The toggle switch is used to select different gas types; A function confirmation key is used to confirm the input of the simulated gas concentration value and the input of the gas type, so as to trigger the output of the simulated gas concentration value signal and the output of the gas type selection signal; The clear key is used to reset the entered simulated gas concentration value to zero.

5. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 4, characterized in that, The switching keys include a previous page key and a next page key, used to select different gas types.

6. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 1, characterized in that, The analog sensor signal includes a gas concentration numerical signal and a gas type signal; The signal output interface includes: A type signal interface is used to transmit the gas type signal; A numerical signal interface is used to transmit the gas concentration numerical signal.

7. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 6, characterized in that, The number of the type signal interfaces includes one or more, and each type signal interface outputs a gas type signal.

8. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 1, characterized in that, Also includes: A power interface is provided for connecting an external power source to power the test fixture that outputs the signal from the simulated environmental gas monitoring sensor.

9. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 1, characterized in that, The input module can input various gas type selection signals.

10. The test fixture for the signal output of the simulated environmental gas monitoring sensor according to claim 9, characterized in that, The multiple gas type selection signals include at least one of PM2.5 gas type selection signal, carbon monoxide gas type selection signal, and methane gas type selection signal.

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