Remote gas concentration measuring instrument

Abstract

The utility model provides a remote gas concentration measuring instrument which comprises a gas sensor module, a signal processing module, a wireless communication module and a power supply module, the gas sensor module is in contact with gas to be detected, generates an analog signal and sends the analog signal to the signal processing module; the gas sensor module comprises a gas sensor, a protective shell is arranged outside the gas sensor, a gas flow channel leading to the gas sensor from the outside is formed in the protective shell, and the gas sensor is arranged at the tail end of a to-be-detected gas pipeline; the signal processing module receives an analog signal, converts the analog signal into a digital signal, filters and amplifies the digital signal, generates a gas concentration signal and sends the gas concentration signal to the wireless communication module; the wireless communication module receives the gas concentration signal, generates a corresponding wireless signal and sends the wireless signal to the remote monitoring terminal; according to the utility model, the efficiency of maintenance and replacement work is improved, and the replacement time is shortened.

Description

A remote gas concentration measuring instrument Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a remote gas concentration measuring instrument. Background Technology

[0002] In the metallurgical and chemical industries, accurate detection of the concentration of coal gas or other toxic and harmful gases is crucial during maintenance and replacement processes.

[0003] Currently, existing gas detectors can only perform local detection and cannot achieve remote functionality. This makes it difficult for staff to monitor gas concentration in real time during the replacement process, requiring frequent on-site checks. Especially when using nitrogen or other inert gases to replace coal gas or toxic or harmful gases, the inability to promptly determine whether the gas concentration has reached safety standards (e.g., less than 24 ppm) necessitates prolonged replacement, resulting in significant waste of nitrogen and other inert gases, increased production costs, and potential disruptions to maintenance progress and safety due to the inability to accurately control replacement time. Summary of the Invention

[0004] This invention provides a remote gas concentration measuring instrument, which solves the problem that existing gas inspection and replacement technologies cannot detect gas concentration in real time.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A remote gas concentration measuring instrument, comprising a gas sensor module, a signal processing module, a wireless communication module, and a power supply module;

[0007] The gas sensor module contacts the gas to be measured and generates an analog signal, which is then sent to the signal processing module. The gas sensor module includes a gas sensor, which is surrounded by a protective housing. The protective housing has an airflow channel leading from the outside to the gas sensor. The gas sensor is located at the end of the gas pipe to be measured.

[0008] The signal processing module receives analog signals, converts them into digital signals, and performs filtering and amplification. The signal processing module also generates a gas concentration signal and sends it to the wireless communication module.

[0009] The wireless communication module receives the gas concentration signal and generates a corresponding wireless signal, which is then sent to the remote monitoring terminal.

[0010] The power supply module is electrically connected to the gas sensor module, the signal processing module, and the wireless communication module, respectively.

[0011] Furthermore, the gas sensor is model SK-600-NH3.

[0012] Furthermore, the outer casing is made of stainless steel or a polytetrafluoroethylene coating.

[0013] Furthermore, the signal processing module includes a signal conversion circuit, a signal conditioning unit, and a microprocessor;

[0014] The signal conversion circuit converts the analog signal into a digital signal and sends it to the signal conditioning unit.

[0015] The signal conditioning unit includes a filtering circuit and an amplification circuit. The filtering circuit receives a digital signal and generates a filtered signal, which is then sent to the amplification circuit. The amplification circuit receives the filtered signal and generates an amplified signal, which is then sent to the microprocessor.

[0016] The microprocessor receives the amplified signal and generates a gas concentration signal, which is then sent to the wireless communication module.

[0017] Furthermore, the power module is a lithium battery or an external DC power supply.

[0018] Furthermore, the wireless communication module is model nRF24L01+.

[0019] Furthermore, the signal conversion circuit is model AD7798, the signal conditioning unit is model AD8250, and the microprocessor is model ESP32.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention, through remote real-time detection and alarm functions, allows staff to promptly grasp the gas concentration situation without going to the site, greatly improving the efficiency of maintenance and replacement work and shortening the replacement time.

[0022] This invention can precisely control the replacement time of nitrogen or other inert gases, avoiding nitrogen waste caused by excessive replacement and effectively reducing production costs. Taking a large or medium-sized metallurgical enterprise as an example, it is estimated that it can save 382,500 cubic meters of nitrogen consumption and 279,200 yuan in costs annually.

[0023] This utility model's real-time remote monitoring and alarm system ensures that the replacement process is stopped promptly once the gas concentration reaches the safety standard, preventing safety accidents caused by untimely or excessive replacement, and protecting the lives of maintenance personnel and the production safety of the enterprise. Attached Figure Description

[0024] To more clearly illustrate the embodiments of this utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the structure of this utility model.

[0026] Explanation of icon numbers:

[0027] 1. Gas sensor module; 2. Signal processing module; 3. Wireless communication module; 4. Power supply module; 5. Gas sensor; 6. Protective housing; 7. Airflow channel; 8. Signal conversion circuit; 9. Signal conditioning unit; 10. Microprocessor. Detailed Implementation

[0028] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. 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.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0032] This utility model provides a technical solution: a remote gas concentration measuring instrument, as shown in Figure 1, including: a gas sensor module 1, a signal processing module 2, a wireless communication module 3, and a power supply module 4;

[0033] The gas sensor module 1 contacts the gas to be measured and generates an analog signal, which is then sent to the signal processing module 2. The gas sensor module 1 includes a gas sensor 5, which is enclosed in a protective housing 6. An airflow channel 7 is provided on the protective housing 6, allowing airflow from the outside to the gas sensor 5. The gas sensor 5 is positioned at the end of the gas pipeline. The gas sensor module employs a high-sensitivity gas sensor capable of accurately detecting the concentration of coal gas or other toxic and harmful gases. In this embodiment, the gas sensor 5 is preferably a CO concentration detector manufactured by Dongri Yingneng, model SK-600-NH3. This sensor is installed at the displacement vent point at the end of the coal gas or toxic and harmful gas pipeline, allowing direct contact with the gas to be measured. Sensor selection: Semiconductor or electrochemical gas sensors with high sensitivity and selectivity for coal gas (such as a mixture of carbon monoxide and hydrogen) and other common toxic and harmful gases (such as hydrogen sulfide and sulfur dioxide) are selected. These sensors are based on specific physical or chemical principles; when in contact with the target gas, their electrical properties (such as resistance and current) change, thereby enabling the detection of gas concentration. For example, the working electrode, counter electrode, and reference electrode in an electrochemical sensor generate a current signal proportional to the gas concentration when reacting with the target gas. The sensor is equipped with a special protective housing made of corrosion-resistant and high-temperature-resistant materials (such as stainless steel or PTFE-coated materials) to withstand the harsh working environments of metallurgy and chemical industries. Simultaneously, the housing is designed with gas flow channels to ensure that gas can smoothly enter the sensor's detection area. Furthermore, the sensor is equipped with an automatic calibration function, which periodically calibrates the sensor via a built-in standard gas source or an interface that can connect to external calibration equipment to ensure measurement accuracy.

[0034] The signal processing module 2 receives analog signals, converts them into digital signals, and performs filtering and amplification. The signal processing module 2 generates a gas concentration signal and sends it to the wireless communication module 3.

[0035] The signal processing module 2 includes a signal conversion circuit 8, a signal conditioning unit 9, and a microprocessor 10. The signal processing module is connected to the gas sensor module, receives the analog signal acquired by the sensor, and converts it into a digital signal. Simultaneously, it performs filtering, amplification, and other processing on the digital signal to improve its quality and accuracy. The signal conversion circuit uses a high-precision analog-to-digital converter (ADC) chip to convert the weak analog signal output by the gas sensor into a digital signal. The ADC's resolution and sampling rate are optimized based on the characteristics of the sensor signal; for example, a 16-bit resolution ADC is selected to accurately capture minute signal changes.

[0036] The signal conversion circuit 8 converts the analog signal into a digital signal and sends it to the signal conditioning unit 9; the signal conversion circuit 8 preferably uses a high-precision analog-to-digital converter (ADC) chip, model AD7798.

[0037] The signal conditioning unit 9 includes a filtering circuit and an amplification circuit. The filtering circuit receives the digital signal and generates a filtered signal, which is then sent to the amplification circuit. The amplification circuit receives the filtered signal and generates an amplified signal, which is then sent to the microprocessor 10. The filtering circuit employs a combination of multi-stage active and passive filtering to effectively filter out the influence of environmental noise (such as electromagnetic interference and noise generated by mechanical vibration) on the sensor signal. The amplification circuit is designed with an appropriate gain factor based on the strength of the sensor signal, amplifying the weak signal to a range suitable for subsequent processing and transmission, while ensuring the linearity of the signal. In this embodiment, the signal conditioning unit 9 preferably uses a programmable gain amplifier, model AD8250.

[0038] The microprocessor 10 receives the amplified signal and generates a gas concentration signal, which is then sent to the wireless communication module 3. The microprocessor unit employs a low-power, high-performance microprocessor to coordinate the various functions of the signal processing module. The microprocessor also interacts with the wireless communication module, sending the processed gas concentration data to the wireless communication module. Preferably, the microprocessor 10 is a low-power microcontroller, model ESP32.

[0039] The wireless communication module 3 receives gas concentration signals and generates corresponding wireless signals to send to the remote monitoring terminal. The wireless communication module also receives gas concentration data processed by the signal processing module and sends it to the remote monitoring terminal via wireless communication (such as Wi-Fi, ZigBee, or other suitable wireless protocols). Furthermore, when the detected gas concentration is less than 24 ppm, the module triggers a remote alarm function, sending alarm information to relevant personnel. Communication protocol selection and implementation: Depending on the communication environment and distance requirements of the industrial site, wireless communication protocols such as Wi-Fi, ZigBee, and LoRa can be selected. In areas with existing Wi-Fi network coverage, Wi-Fi is preferred due to its high-speed data transmission capability. For long-distance scenarios or scenarios with lower power consumption requirements, ZigBee or LoRa are more advantageous. The communication module integrates corresponding communication protocol chips and antennas to achieve bidirectional communication with the remote monitoring terminal. In this embodiment, the preferred model of the wireless communication module 3 is nRF24L01+.

[0040] When the microprocessor determines that the gas concentration is less than 24 ppm, it sends an alarm command to the wireless communication module. The wireless communication module then sends the alarm information to the remote monitoring terminal according to a preset communication protocol format. The alarm information includes detailed information such as the gas concentration value, detection location, and alarm time, enabling staff to quickly locate the problem and take appropriate measures.

[0041] The power module 4 is electrically connected to the gas sensor module 1, the signal processing module 2, and the wireless communication module 3, respectively. The power module provides a stable power supply to the entire measuring instrument, and can be powered by a battery or an external power source, ensuring continuous and stable operation of the instrument during maintenance and replacement. Power supply options: The power module supports multiple power supply methods, including rechargeable lithium batteries and external DC power supplies. Lithium batteries offer advantages such as easy installation and continuous power supply in the absence of an external power source, while external DC power supplies can be used in locations with a stable power supply, ensuring uninterrupted operation of the measuring instrument.

[0042] The installation steps of this utility model are as follows: Install the gas sensor module at a suitable location at the end of the gas or toxic / hazardous gas pipeline's venting point, ensuring that the sensor is in full contact with the gas and is securely installed. Connect the signal processing module, wireless communication module, and power supply module, and check whether the connection lines between each module are normal. Configure the wireless communication module to establish a stable communication connection with the remote monitoring terminal.

[0043] The method of using this utility model is as follows: During the maintenance and replacement of coal gas or toxic and harmful gases, the remote coal gas concentration measuring instrument is activated. The gas sensor module collects gas concentration data in real time and transmits it to the signal processing module. The data processed by the signal processing module is sent to the remote monitoring terminal via the wireless communication module. When the remote monitoring terminal receives data showing a coal gas concentration of less than 24 ppm, the system automatically triggers the alarm function and prompts the staff to stop the nitrogen or other inert gas replacement operation. Throughout the process, the power module continuously supplies power to the measuring instrument to ensure its stable operation.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A remote gas concentration measuring instrument, characterized in that, include: The system comprises a gas sensor module (1), a signal processing module (2), a wireless communication module (3), and a power supply module (4). The gas sensor module (1) contacts the gas to be measured and generates an analog signal, which is then sent to the signal processing module (2). The gas sensor module (1) includes a gas sensor (5), which is provided with a protective housing (6). An airflow channel (7) is provided on the protective housing (6) leading from the outside to the gas sensor (5). The gas sensor (5) is located at the end of the gas pipeline to be measured. The signal processing module (2) receives the analog signal, converts it into a digital signal, and performs filtering and amplification. The signal processing module (2) generates a gas concentration signal and sends it to the wireless communication module (3). The wireless communication module (3) receives the gas concentration signal and generates a corresponding wireless signal, which is then sent to a remote monitoring terminal. The power supply module (4) is electrically connected to the gas sensor module (1), the signal processing module (2), and the wireless communication module (3), respectively.

2. The remote gas concentration measuring instrument according to claim 1, characterized in that: The gas sensor (5) is model SK-600-NH3.

3. The remote gas concentration measuring instrument according to claim 1, characterized in that: The outer shell is made of stainless steel or a polytetrafluoroethylene coating.

4. The remote gas concentration measuring instrument according to claim 1, characterized in that: The signal processing module (2) includes a signal conversion circuit (8), a signal conditioning unit (9), and a microprocessor (10); the signal conversion circuit (8) converts the analog signal into a digital signal and sends it to the signal conditioning unit (9); the signal conditioning unit (9) includes a filtering circuit and an amplification circuit, the filtering circuit receives the digital signal and generates a filtered signal and sends it to the amplification circuit, the amplification circuit receives the filtered signal and generates an amplified signal and sends it to the microprocessor (10); the microprocessor (10) receives the amplified signal and generates a gas concentration signal and sends it to the wireless communication module (3).

5. The remote gas concentration measuring instrument according to claim 1, characterized in that: The power module (4) is a lithium battery or an external DC power supply.

6. The remote gas concentration measuring instrument according to claim 1, characterized in that: The wireless communication module (3) is model nRF24L01+.

7. The remote gas concentration measuring instrument according to claim 4, characterized in that: The signal conversion circuit (8) is model AD7798, the signal conditioning unit (9) is model AD8250, and the microprocessor (10) is model ESP32.

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