What is smart city ?
The basic requirement of a smart city is that the objects in the city are connected, and each object that needs to be identified and managed needs to be equipped with a corresponding sensor. At present, as an important part of the Internet of Things, sensors have been raised to new heights. The research and development of new sensors continues to grow, and the market position is increasingly prominent; whether it is in industrial manufacturing, home life, environmental protection, biomedical care, urban transportation or logistics Sensors with different functions are inseparable in many segments of the Internet of Things, such as transportation.
SenTec provides remote monitoring solutions for the automatic monitoring of wind power tower infrastructure, the settlement of urban integrated pipe corridors, municipal engineering intelligent transportation, and urban central heating center pipeline pressure, temperature, flow and other remote monitoring solutions.
Therefore, the upgrading of sensors has become the key to the rapid development of smart cities.
How does smart city sensors contribute to city construction?
Let’s take a look at the smart city construction field closely related to SenTec sensor technology. What are the latest developments and applications?
1. A variety of sensors help greenbelt maintenance
At present, we are accelerating the application of smart gardens in the maintenance of urban landscaping projects. The greening and gardening department has set up 200 monitoring points in green areas such as main roads and squares. Among them, on the green space of Moonlight Plaza in Gulou District, the garden maintenance unit has set up two soil moisture monitoring points. Solar panels are installed on the small poles to power the entire monitoring and control system. A small cover plate in front of the pole is installed underground with soil moisture sensors, temperature sensors, rain sensors, as well as solenoid valves and flow sensors for water supply pipes.
Insert the SenTec sensor into the green underground to monitor soil moisture, temperature and other indicators in real time. When the humidity is lower than a certain value, the irrigation system will automatically start watering. This intelligent irrigation control and monitoring system not only monitors the soil humidity, but also the temperature and rainfall in the environment. For example, if the humidity is lower than 50%, the solenoid valve will automatically open for watering; the temperature is lower than 5°C, regardless of the humidity, The solenoid valve is automatically closed to avoid freezing caused by watering. The water in the soil is a conductor, and the relative humidity of the soil can be indicated according to its concentration. The sensor automatically performs temperature compensation, and the output is standard 4-20 mA, 0-2Vdc or digital RS485 / Modbus using MCS module. The sensor can be easily connected with any acquisition system, which allows the calculation of the value of VWC by performing an equation through an approximate method.
SenTec flow sensor monitors the flow of water supply pipes and warns of possible pipe damage. In terms of flow monitoring, Gongmin.com recommends the use of SenTec low-pressure flowmeters. It has a wide range of uses and is suitable for a variety of applications and fluids. The integrated PCB emits an infrared signal, which is interrupted by the three blades of the rotor. The SMD component converts the interrupted signal into a pulse. The structure and geometry of the rotor housing of the SenTec flow sensor enables it to withstand high pressures.
2. Taiwan installed 345 SenTec air quality sensors
A few days ago, Taiwan has installed 345 micro air quality sensors in the city to monitor air quality. SenTec micro sensors are attached to the light poles at a height of about 3 meters from the ground. The monitoring items include temperature, humidity, and fine suspended particles (PM2). .5) Data such as wind speed and wind direction can be generated in 3 minutes. Among them, the Hsinchu Science Park, Xiangshan Industrial Park, and major transportation routes have been built the most, allowing the public to check air quality online, responding well, and safeguarding health. In addition, 8 wind speed and wind direction sensors have been added this year to enhance the effect of environmental analysis.
SenTec micro-sensors can monitor air quality changes 24 hours a day. In the event of an abnormality, the system will issue a warning. Inspectors can use computer data to grasp the sources and incidents of air pollution that may be illegal in real time, so that the efficiency of inspections can be doubled with half the effort. If there is an object detection gas in the air, the higher the concentration of the gas, the higher the conductivity of the sensor. With only a simple circuit, the change in conductivity can be converted into a signal output corresponding to the gas concentration.
3. Installation of overpass health monitoring system on expressways
Bridge safety has always been an important part of the safe operation of expressways, and it is also the top priority of daily bridge maintenance. At present, in the 16 years since the opening of Zhengshao Expressway in Zhengzhou, Henan, bridge diseases have increasingly presented problems such as diversity, complexity and concealment. Recently, in order to ensure the safe operation of the overpass along Zhengshao Expressway, a set of overpass health monitoring system will be installed on the bridge. It is understood that the project will be implemented on October 9th and is expected to be completed in late October. It is reported that the monitoring system used in this project is mainly based on the building attitude sensor developed in cooperation with foreign companies, plus crack needles and resistive sensors. Sensors such as strain gauges can achieve the purpose of automatic overpass monitoring. On the other hand, the project installed sensors on the main stress-bearing parts of the bridge to achieve the four real-time and effective supervision goals of “real-time monitoring, real-time communication, real-time calculation, and real-time early warning”.
