1. Overview
The intelligent manhole cover system utilizes the Internet of Things, sensors, edge computing technology, intelligent control technology, data storage technology and big data analysis and processing technology to realize the status, temperature, liquid level, and concentration of toxic and harmful gases in urban manhole covers, pipe networks, and pipeline monitoring points. Real-time data collection, processing, storage, comparison and analysis. When monitoring the state of the manhole cover, monitoring gas, or working condition is abnormal or exceeds the standard, the intelligent monitoring platform generates alarm information, and automatically triggers the safe disposal and operation and maintenance process.

2. Features
1. Manhole cover status monitoring
Manhole cover inclination, manhole cover opening, displacement status monitoring. A manhole cover detector is installed on the manhole cover, and the terminal monitors the state and trajectory analysis of the manhole cover through the full-axis inclination angle sensing technology. Know the abnormal information of manhole cover at the first time, schedule and deal with it in time, and greatly improve the management efficiency. Realize real-time alarm when abnormality is found, prevent in advance, actively manage, reduce maintenance costs and losses, and discover and eliminate potential safety hazards in advance.
2. Intelligent monitoring of underground water level
Through the installation of intelligent monitoring terminal for underground water level, the method of dynamic over-limit collection of underground water level is strengthened, and overflow alarm is realized.
3. Water quality monitoring
Collect water quality PH value, TDS, etc., and upload to the cloud server platform to assist in the detection of mixed flow of rain and sewage.
4. Toxic and harmful gas monitoring
Monitoring of toxic and harmful gases such as H2S and CH4 in wells.
5. Support NB-IoT communication mode, support MQTT/CoAP and other protocols
6. The battery voltage is collected for communication and low voltage alarm is realized.
7. In the event of an emergency, the system will automatically send out alarm information and signals to notify relevant personnel to take emergency measures to avoid accidents;
8. Ultra-low power consumption design: The product adopts micro power consumption design, built-in battery power supply, under ideal environment, the battery life can be as long as 3-5 years.
9. Timing status reporting function: The NB-IoT smart manhole cover monitoring sensor adopts a micro-power consumption design and is in sleep mode when there is no cover opening alarm event. The device has the ability to regularly report device status information every day, including battery voltage and manhole cover status. And other information, even if there is no alarm event, you can grasp the equipment running status every day.
10. Alarm event filtering: The device has a multi-level alarm event filtering function to avoid false alarm events caused by vehicle passing and vibration. By avoiding the transmission of false positive information, the energy consumption can be effectively reduced.
11. Remote parameter configuration: After the installation of the NB-IoT smart manhole cover monitoring sensor is completed, remote parameter configuration of the device can be performed as required, which is easier to use and more convenient to maintain.
12. Intelligent design: The product adopts intelligent function design, integrates edge computing, effectively filters false alarm information, and ensures the normal operation of the equipment. It has configurable transmission period and acquisition period, and reports alarm information immediately when the state of the manhole cover changes, so as to report any changes.
13. Easy installation and easy maintenance: The product can choose screw fixing, glue fixing, bracket fixing and other installation and fixing methods, which are suitable for the installation and monitoring of manhole covers of different shapes and types. Not only the equipment is more versatile, but also the follow-up maintenance can pass A screwdriver can complete the removal and installation of the device.

3. Technical advantages
Built-in high-performance lithium-tium battery, can last for up to 5 years. According to user needs, it can be equipped with various sensors to monitor the full-axis inclination sensor of cover opening and displacement, water level, toxic gas, environment, etc. Combined with its use environment, the smart manhole cover has a waterproof IP68 grade design, which can be used in humid environments. It can work stably for a long time and has the characteristics of low temperature and high temperature resistance.
Smart manhole cover monitoring system, the monitoring platform and mobile APP control have changed from traditional manual inspection to intelligent monitoring, with voice, SMS, APP alarm, GPS map display, making maintenance more targeted, improving work efficiency and reducing maintenance costs .