Urban safety is the cornerstone of modern governance. With the continuous deepening of urbanization in China, the number and density of limited spaces such as underground pipelines, comprehensive pipe galleries, and various well chambers continue to increase, and their safe operation directly affects the resilience and stability of urban lifelines. These underground infrastructure facilities undertake key functions such as water supply, drainage, gas, electricity, and communication. Once a safety accident occurs, it not only threatens the life safety of frontline workers, but may also trigger a chain reaction and affect the normal operation of the city.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In this context, Qingqiao focuses on the key field of "limited space safety monitoring" and launches a limited space intelligent monitoring and early warning terminal. This product takes "technical defense+intelligent defense" as the core idea, realizing real-time monitoring and early warning of various gases such as methane, carbon monoxide, hydrogen sulfide, oxygen, etc. It has installed a set of "safety perception nerves" for urban underground concealed spaces, using technological means to build a life defense line for frontline workers, and providing basic perception support for urban lifeline engineering and resilient city construction.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In this episode of 'Ningdian Interview', we have invited Li Xuebing, the Technical Director of the G5687-ST2501 project for the Qingqiao Limited Space Intelligent Monitoring and Early Warning Terminal. Li Xuebing has been deeply involved in the field of sensors for over 20 years, spanning his career from research and development, sales to product innovation. In 2025, Li Xuebing joined the Qingqiao G5687-ST2501 project, focusing on the major issue of "limited space safety" and initiating research and development of intelligent monitoring equipment. This time, he will provide us with in-depth sharing on the product development process, technological breakthroughs, application practices, and future directions.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

You have been deeply involved in the field of sensors for over 20 years. How did you initially view Qingqiao's efforts in "limited space safety monitoring"?

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Li Xuebing: I am very interested in this topic and think it is very important. 'Limited space safety monitoring' is the key to saving lives. Toxic and harmful gases such as hydrogen sulfide and carbon monoxide are prone to accumulate in a closed environment and can cause coma or death in a short period of time. Real time monitoring can provide early warning, avoid blind entry, and prevent fatal accidents such as poisoning, suffocation, and explosions. Not monitoring is risking one's life.

The confined space work environment is concealed and high-risk, and once an accident occurs, it is easy to cause a chain of casualties. In my opinion, the social value of its safety monitoring is mainly reflected in three aspects:

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Firstly, safeguarding the lives of frontline workers is the most fundamental value. Through real-time gas detection, personnel positioning, and mandatory interlocking, we can issue warnings before dangers such as poisoning and hypoxia occur, or automatically initiate emergency rescue when personnel are unconscious, transforming accidents from "blind rescue leading to increased casualties" to "controlled disposal" and reducing the mortality rate in scenarios such as municipal dredging and industrial and trade enterprise construction.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Secondly, reduce the indirect costs to society. A confined space accident often comes with high government rescue investment, losses from work stoppage and rectification, as well as family tragedies and social conflicts caused by casualties. Effective monitoring is equivalent to using minimal technological investment to avoid huge medical, compensation, regulatory, and public opinion repair costs for society.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Thirdly, promote the civilized process of safety production. Upgrading the outdated management of "person to person" to "technical and intelligent defense" is not only a compliance requirement, but also reflects society's respect for workers' right to life. This transparent control over hazardous operations is an important benchmark for measuring the industrialization level and humanistic care of a region or industry.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

As the first generation limited space intelligent monitoring product of Qingqiao, what are its functions and roles? What are the main applications in which scenarios?

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Li Xuebing: The first generation of limited space intelligent monitoring products, called limited space intelligent monitoring and early warning terminals. Firstly, its core function is to detect the concentrations of gases such as oxygen, hydrogen sulfide, carbon monoxide, and methane in real-time through pumping sampling, while also detecting liquid level, temperature, and air pressure. Once the value exceeds the set alarm threshold, the product will immediately report a platform alarm.

On this basis, the product also integrates multiple practical functions: the product has a built-in battery, which can work on its own for no less than two years without frequent replacement. The signal is uploaded to the cloud platform via 4G, and is equipped with a LCD display and status light, which can visually display the detection status. It is also equipped with Beidou positioning function, which can accurately lock the position of the device.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In terms of data collection and processing, the backend cloud platform will store the data transmitted by the product. Once the value exceeds the standard, the platform will promptly alert the management personnel through SMS, voice and other means to remind them to handle it.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

The first generation product is mainly suitable for scenarios such as septic tanks, underground valve wells, various pump stations, and station buildings. These places generally have the characteristics of small space, poor ventilation, and easy accumulation of harmful gases. Manual inspection is difficult and risky. Through this 24-hour online monitoring method, it can effectively fill the blind spots of manual operations, achieve early detection, early warning, and early disposal.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Compared to similar products on the market before, what important breakthroughs and improvements has this product achieved in key indicators such as detection accuracy, response speed, and data transmission?

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Li Xuebing: Products commonly used in such scenarios on the market are single methane gas detection equipment or composite free diffusion detection equipment. Products that can fully meet the harsh environment underground and have comprehensive functions like this are indeed rare before.

李学兵：市场上这类场景应用的产品，常见多为单一甲烷气体检测设备或者复合式自由扩散式检测设备，像这样能够完全满足井下的恶劣环境且功能全面的产品，此前确实少见。

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

This product not only has centralized and comprehensive detection parameters, but also achieves significant improvements in detection accuracy and reliability. We have adopted a laser methane sensor that is anti-interference, high humidity resistant, and corrosion-resistant. At the same time, we have optimized the design of the pump suction path, completely solving the problem of high humidity condensation affecting and damaging other sensors. This ensures that the product does not falsely report or fail during use, with an extremely low failure rate.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In terms of detection logic, we have optimized the pump suction sampling process. The sample gas will first undergo active dehumidification treatment before concentration analysis and detection, ensuring higher detection accuracy and repeatability.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In terms of data transmission, the product adopts 4G CAT1 mode, combined with high gain antennas to ensure signal stability. At the software level, it also has the ability to automatically diagnose signal strength, adjust transmission modes according to actual situations, and with redundant design, ensure efficient and authentic data uploading in all aspects.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

What are the unique considerations and highlights in the technical design of this product for the special environment of limited space?

Li Xuebing: In response to this special environment, we have indeed made many unique considerations in our technical design, mainly reflected in the three dimensions of architecture, structure, and selection.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

At the architecture level, we first selected electrochemical sensors and laser sensors with good anti-interference performance, combined with signal processing and software algorithms, effectively avoiding false alarms caused by environmental interference. At the same time, the product adopts a low-power mode, with built-in battery power supply and 4G transmission communication method, saving the trouble of on-site wiring. The addition of satellite positioning function also facilitates the fixed-point maintenance of equipment in the later stage. We have adopted edge intelligence design, and the device can perform intelligent calculations directly on the main control chip based on local monitoring data to determine the danger. Even if the network is disconnected, it can still issue an alarm prompt through the color changing lights on the device. In addition, considering the convenience of operation and maintenance, we have added a short-range wireless wake-up function - when the device is in a sleep state during non working hours, operation and maintenance personnel can use the wake-up device to wake up the device in a non-contact manner at close range, and timely check the monitoring status or troubleshoot problems.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In terms of structural design, we have implemented IP68 protection for the entire equipment in response to the high temperature and humidity environment underground. We have also treated the circuit with moisture-proof measures and prevented humid air from entering the air module when not in use, ensuring stable operation of the equipment. In the face of a dusty environment, we have chosen replaceable dust prevention accessories, which not only avoid pipeline blockage but also facilitate operation and maintenance, without affecting the normal detection of equipment. To meet the needs of quick installation and maintenance, we have designed a quick installation structure and handle rope for faster on-site installation. At the same time, we use safety ropes to connect the equipment to the quick installation structure, preventing the equipment from falling and losing, and also avoiding safety accidents during operation and maintenance. For installation scenarios with inclined wellbore walls, we have also installed support arms to avoid interference from the wellbore wall on radar level detection.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

We also strictly control the selection of materials. All accessories and circuit components have undergone anti-corrosion and rust prevention treatment, and have passed corresponding tests to ensure that the product has long-term reliable corrosion resistance performance in harsh environments.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

What technical difficulties have you encountered in ensuring the stability and reliability of monitoring data in a complex environment of high humidity, high temperature, dust, and corrosion in a limited space? How was it conquered?

Li Xuebing: In such a complex environment, ensuring the stability and reliability of monitoring data has indeed encountered many technical difficulties, which we have overcome step by step through exploration and repeated experiments.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

The first difficulty is how to accurately determine the liquid level underground and prevent the air pump from mistakenly starting and sucking water into the gas module. We conducted repeated experiments and ultimately chose a combination of radar liquid level and water immersion detection, which can not only monitor water level changes in real time, but also prevent the air pump from sucking water into the air path from the source.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

The second difficulty is the waterproofing of gas pipelines during underground falls. We have tried several solutions before and after. At the beginning, the U-shaped structure was tested for waterproofing, but based on actual usage, product weight distribution, and drop testing, the reliability of waterproofing is not high. After the first solution was rejected, we switched to a one-way valve structure, hoping to prevent water from flowing back through the one-way valve. However, after overall testing, it was found that the pressure of the air pump is not sufficient to stably drive the one-way valve to close, and there is still a risk of failure. After the second plan also failed, our team decided to adopt a different approach after repeated discussions - no longer relying on the waterproof structure of the air circuit itself, but using the method of blocking the pipeline, that is, the active solenoid valve cutting off the blocking method, to prevent the possibility of water backflow into the intake circuit and damage to the sensor from the system level. We have proposed multiple solutions in this direction, and after extensive testing and comparison, we have finally finalized a more suitable structure. The reliability of anti backflow is much more stable than the previous solutions.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

The third difficulty is the moisture resistance of the product. We have tested various structural designs and moisture-proof materials, and specially protected the sensors to ensure that they can meet the requirements of high humidity environments without interfering with gas detection. It can be said that behind every difficulty lies a process of repeated trial and error and continuous optimization.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

What is the current progress of product development? Has it met expectations? If we want to optimize, which sector will we focus on?

Li Xuebing: The first generation product has been successfully launched and the overall research and development progress is in line with the expected timeline. However, there is still room for optimization in terms of product volume, and the current overall weight is 3.5 kilograms. Taking the application scenarios of septic tanks underground as an example, the existing volume has a certain impact on installation and cleaning operations, and the equipment needs to be removed during cleaning. For this purpose, we have equipped a lifting rope, which allows the equipment to be lifted from above during cleaning, making the operation relatively simple; After the cleaning is completed, with the help of the bottom counterweight, it can be smoothly placed back along the installation bracket guide rail.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

The next step of optimization will mainly be promoted from three aspects: firstly, optimizing power consumption at the electronic level, adjusting detection frequency reasonably, and improving the timeliness of data updates; The second is to reduce battery capacity on the basis of overall system improvement, and simultaneously achieve volume reduction and weight reduction; The third is to further optimize the utilization of internal space, compress the volume, and reduce the weight of some components to reduce the overall weight of the machine.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Among them, the focus of optimization is to reduce product volume, and the reduction of battery volume is the primary breakthrough point. At the beginning of the design of the first generation product, in order to ensure redundancy, the battery capacity was set to be relatively sufficient. After practical application testing and feedback from usage data such as testing frequency, we found that the battery volume has a large compression space, which will also become a key direction for subsequent product iterations.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

From the perspective of overall planning, what other extensions and breakthroughs will future products have?

Li Xuebing: From the perspective of overall planning, the extension and breakthrough of future products can be mainly divided into two dimensions: continuous iteration on the product side and comprehensive upgrading on the platform side.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

On the product side, we focus on three directions. The first is miniaturization, which makes installation and maintenance in small spaces such as septic tanks and valve wells more convenient. The second is longer battery life, continuously optimized on the basis of existing low-power design, with the goal of increasing the self-sustaining working life to more than 3 years, further reducing the frequency and cost of operation and maintenance. The third is more convenient maintenance, which includes two aspects: on the one hand, developing intelligent wireless portable devices to achieve rapid on-site detection and configuration of in use equipment, and improving operation and maintenance efficiency; On the other hand, adding intelligent analysis modules on the platform side, combined with algorithms to make predictive judgments on sensor consumption, equipment status, etc., can provide early warning of potential faults, transform passive maintenance into active maintenance, and make operation and maintenance arrangements more accurate and efficient.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

On the platform side, we will move from simple data monitoring to a closed-loop management and disposal of the entire process. Based on the existing cloud platform, we will further build a digital management system to achieve comprehensive reception, storage, and analysis of monitoring data. When the data triggers an alert, the platform will combine AI analysis and preset plans to automatically generate solutions and issue disposal tasks to relevant responsible departments. After the relevant departments have completed the disposal, the results will be uploaded to the platform, and the platform will conduct a closed-loop confirmation of the incident handling situation. Through this mechanism, we are evolving from a single hardware terminal to an integrated platform of "monitoring+warning+disposal+management", achieving a complete closed-loop from perception to intervention at the technical architecture and algorithm level, providing users with more systematic and intelligent security capabilities.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

What do you think is the significance of this limited space intelligent monitoring system for urban lifeline engineering and resilient city construction?

Li Xuebing: This limited space intelligent monitoring and warning terminal can simultaneously detect multiple key gas parameters such as methane, carbon monoxide, hydrogen sulfide, oxygen, etc., achieving all-weather online monitoring of limited spaces such as underground pipelines, comprehensive pipe galleries, and various well chambers, and early warning of potential risks such as poisoning, suffocation, and explosions.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

From the perspective of urban lifeline engineering, this system effectively fills the safety monitoring blind spots in underground hidden areas of cities, bringing previously "invisible and intangible" risk points into a perceptible and controllable range, making urban lifelines truly "visible and manageable". At the same time, it upgrades the traditional manual inspection mode to 24-hour uninterrupted intelligent monitoring, greatly improving the timeliness and accuracy of hidden danger detection, effectively reducing the occurrence of safety accidents, and ensuring the safe operation of urban infrastructure.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

From the perspective of resilient city construction, this system significantly enhances the city's ability to quickly perceive and respond to sudden risks through precise front-end perception and intelligent back-end warning. It is not only an important technical support for urban lifeline engineering, but also a fundamental safety perception device for building resilient cities.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In summary, this system is equivalent to installing a "safety perception nerve" for urban underground spaces. Through real-time monitoring and intelligent warning, it prevents major safety accidents and makes urban operations safer and more resilient.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

How do you view the future development direction of gas monitoring technology after years of deep cultivation in the field of sensors?

Li Xuebing: As a technician in the field of sensors, I believe that gas monitoring technology is at a critical juncture where policy driven and technological changes are deeply intertwined. The future development direction can be seen from the following dimensions.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Firstly, there is a continuous increase in policies and regulations. Since 2020, regulations such as the "Safety Regulations for Limited Space Operations in Industrial and Commercial Enterprises" have been revised and strictly enforced, requiring workplaces to be equipped with gas detection equipment, which has driven the rapid growth of compliance demands. The full implementation of standards such as GB 30871 in 2022 and GB 46768 in 2026 means that the entire industry is accelerating towards a mandatory regulatory system of "first detection, multi-point monitoring, and data networking", providing a solid policy foundation for the popularization and upgrading of gas monitoring technology.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

At the level of technological evolution, gas monitoring products are accelerating towards intelligence and integration. Sensors themselves continue to break through towards high precision, long lifespan, and multi parameter direction, gradually expanding their detection parameters from traditional methane, oxygen, hydrogen sulfide, carbon monoxide to various toxic and harmful gases such as VOCs. At the same time, AI early warning and edge computing technologies are increasingly popular, the integration of multiple parameters is constantly improving, and the false alarm rate will be significantly reduced. It is expected that in the next few years, the proportion of devices with intelligent analysis capabilities will exceed 50%.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

At the level of the industrial chain, the process of domestic substitution of sensors has significantly accelerated. Thanks to technological maturity and economies of scale, sensor costs have decreased by 30% to 50% compared to before. In the mid-range market, the proportion of domestically produced sensors has exceeded 60%, effectively reducing the overall deployment threshold and creating conditions for large-scale applications.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

In terms of business model, the industry is transitioning from simple equipment sales to an integrated service-oriented model of "equipment+operation and maintenance+calibration+platform". The leasing model and new commercial forms such as trade in are gradually becoming popular, and the proportion of service income in overall revenue continues to increase. Customers are paying more attention to the user experience and security capabilities throughout the entire lifecycle.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

From the perspective of application scenarios, gas monitoring technology is extending from traditional industrial fields to broader urban governance scenarios. Emerging fields such as urban lifeline engineering, smart construction sites, and hydrogen energy storage have become important growth points. The rigid demand for system support has increased, and higher requirements have been put forward for the reliability, networking capabilities, and data fusion capabilities of monitoring equipment.

However, the working environment in confined spaces is complex and concealed, and toxic and harmful gases are prone to accumulate and difficult to detect. Accidents such as poisoning, suffocation, and explosions often occur. The traditional manual inspection mode is limited by the frequency of operations and on-site conditions, making it difficult to achieve all-weather and precise risk control. Often, it can only passively respond after accidents occur. Faced with this long-standing security pain point, how to weave a dense protective net from the source and transform passive disposal into active warning has become an important issue that urgently needs to be solved in urban security management.

Finally, from the perspective of the industry landscape, market concentration is gradually increasing. Top enterprises, with their ability to provide comprehensive solutions and complete product matrices, have increasingly highlighted their advantages in integration. The tightening of compliance barriers has also accelerated the market clearance of non compliant products. Overall, the gas monitoring industry is entering a high-quality development stage characterized by technology driven, compliance led, and service upgrading.