A gas sensor batch performance detection tool
By designing a batch performance testing fixture for gas sensors, the problem of low detection efficiency of large-scale electrochemical carbon monoxide sensors was solved, achieving efficient and unified performance testing, and improving production efficiency and product consistency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU GANWEN ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-14
AI Technical Summary
Existing technologies cannot efficiently test the performance of large batches of electrochemical carbon monoxide sensors, and the sensors cannot be tested after packaging, resulting in substandard products entering the market and affecting production efficiency and product consistency.
A batch performance testing fixture for gas sensors was designed, including a sensor output module, a main control module, a power supply module, and a communication module. It can simultaneously receive the output voltages of multiple electrochemical carbon monoxide sensors and convert them into digital signals through the main control module, which are then sent to a host computer for testing.
This significantly improves the performance and detection efficiency of the electrochemical carbon monoxide sensor, ensuring product quality consistency and production efficiency.
Smart Images
Figure CN224500507U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrochemical sensors, and more specifically to a tooling for batch performance testing of gas sensors. Background Technology
[0002] With the continuous increase in production capacity, the production speed of electrochemical carbon monoxide sensors is also accelerating. However, a large number of electrochemical carbon monoxide sensors may contain defective products. Therefore, achieving performance testing of large quantities of electrochemical carbon monoxide sensors has become crucial for improving production efficiency. Furthermore, due to the unstable consistency of electrochemical carbon monoxide sensor performance, requirements are placed on sensor testing and consistency classification.
[0003] Previously, a modular testing method was used, which could not perform testing after packaging. Due to the lack of a high reference voltage, some poorly performing sensors could not be detected in a timely manner. Therefore, there is an urgent need for a batch performance testing fixture for gas sensors that can overcome these shortcomings. Utility Model Content
[0004] The purpose of this invention is to provide a tooling for batch performance testing of gas sensors. The sensor output module can simultaneously receive the output voltages of multiple electrochemical carbon monoxide sensors, thereby enabling simultaneous performance testing of multiple electrochemical carbon monoxide sensors based on the output voltage, which significantly improves the performance testing efficiency of electrochemical carbon monoxide sensors.
[0005] To achieve the above objectives, this utility model provides a batch performance testing fixture for gas sensors, including a sensor output module, a main control module, a power supply module, and a communication module.
[0006] The sensor output module is used to convert the output current of the electrochemical carbon monoxide sensor into an output voltage and send the output voltage to the main control module.
[0007] The main control module is used to convert the output voltage into a digital signal and send the digital signal to the host computer through the communication module;
[0008] The power module is used to supply power to the sensor output module, the main control module, and the communication module.
[0009] In another embodiment, the power supply module further includes a low-voltage linear regulator module;
[0010] The low-voltage linear regulator module is used to convert 5V voltage to 3.3V and supply power to the sensor output module, main control module and communication module.
[0011] In another embodiment, the sensor output module is used to simultaneously convert the output current of 16 electrochemical carbon monoxide sensors into output voltage.
[0012] In another embodiment, a gain resistor is provided in the sensor output module;
[0013] The gain resistor is used to change the output voltage of the sensor output module by changing its own resistance value.
[0014] In another embodiment, the sensor output module is provided with a variable resistor;
[0015] The variable resistor is used to change the reference voltage of the sensor output module.
[0016] In another embodiment, the tooling further includes a sealed enclosure;
[0017] The output module, main control module, power supply module, low-voltage linear regulator module, and communication module are all located inside the sealed enclosure.
[0018] In another embodiment, the sealed enclosure is provided with a nitric oxide injection port;
[0019] The carbon monoxide injection port is used to inject carbon monoxide gas into the sealed chamber.
[0020] In another embodiment, a power light is also provided on the sealed enclosure;
[0021] The power indicator light illuminates when the gas sensor batch performance testing fixture is powered on.
[0022] In another embodiment, the power module further includes a protection circuit;
[0023] The protection circuit consists of a fuse, a transient voltage suppressor, and a Schottky diode.
[0024] In another embodiment, the communication module includes a common-mode inductor.
[0025] The beneficial effects of this invention are as follows: The gas sensor batch performance testing fixture of this invention includes a sensor output module, a main control module, a power supply module, and a communication module. The sensor output module converts the output current of the electrochemical carbon monoxide sensor into an output voltage and sends the output voltage to the main control module. The main control module converts the output voltage into a digital signal and sends the digital signal to a host computer through the communication module. The power supply module supplies power to the sensor output module, the main control module, and the communication module. The sensor output module can simultaneously receive the output voltages of multiple electrochemical carbon monoxide sensors, thereby enabling simultaneous performance testing of multiple electrochemical carbon monoxide sensors based on the output voltage, significantly improving the performance testing efficiency of the electrochemical carbon monoxide sensors.
[0026] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of a gas sensor batch performance testing fixture according to an embodiment of this application;
[0028] Figure 2 This is a circuit diagram of a sensor output module according to an embodiment of this application;
[0029] Figure 3 This is a circuit diagram of a main control module according to an embodiment of this application;
[0030] Figure 4 This is a circuit diagram of a power supply module according to an embodiment of this application;
[0031] Figure 5 This is a circuit diagram of a low-voltage linear regulator module according to an embodiment of this application;
[0032] Figure 6 This is a circuit diagram of a communication module according to an embodiment of this application. Detailed Implementation
[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0034] It should be noted that references to "an embodiment," "embodiment," "example embodiment," etc., in this specification refer to the described embodiment including specific features, structures, or characteristics; however, not every embodiment must include these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.
[0035] Furthermore, certain terms are used in the specification and subsequent claims to refer to specific components or parts. Those skilled in the art will understand that manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to." Additionally, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.
[0036] Please see Figure 1 , Figure 1 This is a schematic diagram of a gas sensor batch performance testing fixture. The fixture includes a sensor output module, a main control module, a power supply module, and a communication module. The sensor output module converts the output current of the electrochemical carbon monoxide sensor into an output voltage and sends the output voltage to the main control module. The main control module converts the output voltage into a digital signal and sends the digital signal to a host computer through the communication module. The power supply module supplies power to the sensor output module, the main control module, and the communication module.
[0037] Specifically, the circuit diagram of the sensor output module can be found here. Figure 2The sensor output module simultaneously converts the output current of 16 electrochemical carbon monoxide sensors into output voltage. The sensor output module includes a gain resistor, which changes its resistance to alter the output voltage of the sensor output module. A variable resistor is also included in the sensor output module to change the reference voltage. The sensor output module converts the output current of the electrochemical carbon monoxide sensors into the output voltage of the operational amplifier. This voltage is then converted from an analog voltage to a digital signal by the ADC of the main control module for reading and conversion by the host computer. The module can set different output voltages corresponding to different currents by changing the value of the gain resistor (R73). The reference voltage can be changed by setting different values of the variable resistors (R77, R78). Adjusting the reference voltage and the gain resistor allows this fixture to perform performance testing on sensors with different capabilities, increasing the versatility of the fixture in this application.
[0038] See the circuit diagram of the main control module. Figure 3 The main control module uses the N32G455CCL7. The main control module in this application employs a 32-bit ARM Cortex-M4F core with a maximum operating frequency of 144MHz. It supports floating-point operations and DS instructions, and integrates 256KB Flash, 144KB SRAM, 4x12-bit 5Msps ADCs, 4xOPAMPs, 5xCOMPs, 2x1Msps 12-bit DACs, and capacitive touch buttons. It integrates 3xU(S)ART, 3xI2C, 3xSPI, 1xQSPI, 1xUSB, 2xCAN communication interfaces, and 1xSDIO interface, with a built-in hardware acceleration engine for cryptographic algorithms. It features high integration, high anti-interference capabilities, and high reliability. Combined with mature Keil & IAR debugging and development software, it supports C language and assembly language, as well as assembly instructions.
[0039] See the circuit diagram of the power module. Figure 4 The power supply module also includes a low-voltage linear regulator module. See the circuit diagram for the low-voltage linear regulator module. Figure 5The low-voltage linear regulator module converts 5V to 3.3V and supplies power to the sensor output module, main control module, and communication module. The power supply module also includes a protection circuit consisting of a fuse, a transient voltage suppressor, and a Schottky diode. For the power supply module, this application uses a step-down power management chip packaged in SOT-23-6. This chip supports 4V to 36V input and continuously outputs 1A current. The input terminal forms a protection circuit through a fuse, TVS diode, and Schottky diode. Input and output capacitors bypass high-frequency noise to ground, improving the stability of the output voltage. For the low-voltage linear regulator module, this application uses a low-voltage linear regulator (LDO) packaged in TO-263-4.83mm, which features low noise, high precision, and strong load capacity to convert 5V to 3.3V, supporting the power supply of the main control module, sensor output module, and communication module. The input and output capacitors buffer sudden changes in load current to ensure normal circuit operation.
[0040] See the circuit diagram of the communication module. Figure 6 The communication module is equipped with a common-mode inductor. In this application, a 485 transceiver of model SN65HVD75DR can be selected, with a driving voltage of 3.3V. Using a common-mode inductor increases the anti-interference capability and improves communication stability.
[0041] In another embodiment, such as Figure 1 As shown, the fixture also includes a sealed enclosure; the output module, main control module, power supply module, low-voltage linear regulator module, and communication module are all located inside the sealed enclosure; a nitrogen monoxide injection port is provided on the sealed enclosure; a carbon monoxide injection port is used to inject carbon monoxide gas into the sealed enclosure; a power indicator is also provided on the sealed enclosure; the power indicator lights up when the gas sensor batch performance testing fixture is powered on.
[0042] Specifically, taking the process of batch performance testing of electrochemical carbon monoxide sensors as an example, the power module powers on the entire gas sensor batch performance testing fixture, and the power indicator lights up. At this time, the reference voltage of the sensor output module is read, and then a certain concentration of carbon monoxide gas is injected into the sealed chamber through the carbon monoxide injection port. Each electrochemical carbon monoxide sensor will input its output current to the sensor output module. The sensor output module will convert the output current of the electrochemical carbon monoxide sensor into an output voltage and send the output voltage to the main control module. The main control module can then determine the carbon monoxide concentration detected by each electrochemical carbon monoxide sensor based on the reference voltage and the output voltage, and thus determine the performance test result of each electrochemical carbon monoxide sensor.
[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0044] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A tooling for batch performance testing of gas sensors, characterized in that, The tooling includes a sensor output module, a main control module, a power supply module, and a communication module; The sensor output module is used to convert the output current of the electrochemical carbon monoxide sensor into an output voltage and send the output voltage to the main control module. The sensor output module is equipped with a gain resistor; the gain resistor is used to change the output voltage of the sensor output module by changing its own resistance value. The sensor output module is equipped with a variable resistor; the variable resistor is used to change the reference voltage of the sensor output module. The main control module is used to convert the output voltage into a digital signal and send the digital signal to the host computer through the communication module; The power module is used to supply power to the sensor output module, the main control module, and the communication module.
2. The gas sensor batch performance testing fixture as described in claim 1, characterized in that, The power supply module also includes a low-voltage linear regulator module; The low-voltage linear regulator module is used to convert 5V voltage to 3.3V and supply power to the sensor output module, main control module and communication module.
3. The batch performance testing fixture for gas sensors as described in claim 2, characterized in that, The sensor output module is used to simultaneously convert the output current of 16 electrochemical carbon monoxide sensors into output voltage.
4. The batch performance testing fixture for gas sensors as described in claim 3, characterized in that, The tooling also includes a sealed enclosure; The output module, main control module, power supply module, low-voltage linear regulator module, and communication module are all located inside the sealed enclosure.
5. The batch performance testing fixture for gas sensors as described in claim 4, characterized in that, The sealed enclosure is equipped with a carbon monoxide injection port. The carbon monoxide injection port is used to inject carbon monoxide gas into the sealed chamber.
6. The batch performance testing fixture for gas sensors as described in claim 4, characterized in that, The sealed enclosure is also equipped with a power light; The power indicator light illuminates when the gas sensor batch performance testing fixture is powered on.
7. The batch performance testing fixture for gas sensors as described in claim 1, characterized in that, The power module also includes a protection circuit; The protection circuit consists of a fuse, a transient voltage suppressor, and a Schottky diode.
8. The batch performance testing fixture for gas sensors as described in claim 1, characterized in that, The communication module is equipped with a common-mode inductor.