Remote monitoring integration scheme of water source well + GPRS RTU

　　The shortage of water resources has become a global problem. With the development of economy, the contradiction between the increasing demand for water and the shortage of water resources forces all countries in the world to seek effective solutions. Therefore, using modern means to build a real-time monitoring system of water resources, dynamically grasp the changes and utilization of regional water resources, and maximize the regulation and use efficiency is an urgent need to promote the sustainable development of economy and society.

　　Juying electronics has developed jy-rtu4100 water resources remote monitoring system, which is an automatic network management system combining software and hardware. It is to install a water resource measurement and control device on the equipment of the water source or water consuming unit to realize the collection of water meter flow, well water level, pipe network pressure and the current and voltage of the user's water pump, as well as the control of the start and stop of the water pump and the opening and closing of the electric valve. It is connected with the computer of the water resources management center of the Water Conservancy Bureau through wired or wireless communication, Supervise and control all water users in real time. The data collection of relevant water meter flow, well water level, pipe network pressure and the current and voltage of users' water pumps are automatically stored in the computer database of water resources management center. In case of power failure, additional water pump and natural or man-made damage to the water meter, the computer of the management center will display the cause of the fault and give an alarm at the same time, so as to send personnel to the site in time.

　　Under special circumstances, the GPRS RTU water resources management center can, according to needs: collect water in limited quantities in different seasons and control the start and stop of the pump; For users who owe water resources fees, the staff of the water resources management center can remotely control the opening and closing of the electric valve and the start and stop of the water pump of the water user through the computer system, so as to realize the automation and integration of water resources management and monitoring.

　　Acquisition part: in order to collect the analog output signal (0-5V, 4-20mA) of the primary instrument, we select the A / D converter with high resolution and low power consumption, and select intermittent sampling, that is, close the sampling channel when not sampling to further reduce the power consumption. The collected data needs to be digitally filtered to remove the interference; In order to obtain the measurement results of the primary instrument, we designed RS232 interface and RS485 interface. The actual communication protocol needs to be provided by the instrument manufacturer, and the internal programming of the acquisition instrument can read the measurement results.

　　Analysis and storage part: according to the communication specification with the monitoring center, the acquisition instrument processes the local collected data once (including filtering, alarm inspection, data synthesis encryption, data verification, etc.), and then stores it in flash memory in a certain order to form historical data, which is covered circularly.

　　Transmission part: the transmission part is the key and difficult part, and its quality directly affects the stability of the monitoring system. The acquisition instrument we designed adopts GPRS communication mode. GPRS network has good coverage. It is based on TCP / IP protocol and charges according to traffic.

　　1、 Main functions of the system:

　　1. Real time monitoring and display of water source and user data electronic map (flow, pressure, temperature, working state and other information)

　　2. Active call test function, that is, it can actively extract the data of monitoring points on the server of the dispatching center at any time.

　　3. The data report function automatically generates daily report, monthly report and annual report, and can also carry out statistical report and printing at any time. You can set the automatic printing function.

　　4. The automatic analysis and calculation function analyzes the gas supply, user consumption and line loss (such as hourly consumption and daily consumption) according to the monitored real-time data, and generates an alarm for abnormal conditions; It can be drawn by day, month and year, and the trend chart of gas supply of pipeline network can be counted. Draw instantaneous flow curve, pressure curve and temperature curve of some monitoring points in real time.

　　5. Data storage backup function: the system database can be stored locally, and its storage time is determined according to the demand and computer configuration. In addition to the main dispatching monitoring center, the system can establish sub monitoring centers wherever it wants to establish sub centers, which are connected with the main monitoring center through GPRS network, which greatly facilitates user management and use. The authority of the sub monitoring center is limited to data monitoring, and downward operation is not allowed, which ensures the safety of the system. The data of each sub monitoring center of the main monitoring center is completely synchronized and displayed in real time.

　　6. Automatic fault alarm function: the GPRS flow pressure acquisition and transmission processor at the monitoring point will automatically report the fault information to the monitoring center and automatically print the alarm information. The faults detected automatically include: flowmeter communication fault, 220V AC power failure, pressure sensor fault, temperature sensor fault, etc.

　　7. The system has the function of expansion and upgrading. The system has an open data interface to facilitate the increase and expansion of monitoring points in the later stage.

　　8. System security permission setting function permission setting provides perfect security authentication. Illegal users cannot enter the system, and legal users can operate accordingly according to their permissions.

　　2、 System operation cost

　　System operation cost: the system is charged by data flow. At present, there are two charging methods: monthly system and data flow. Please consult the local mobile business hall for the specific charging standard. The monthly system in Beijing is 20 yuan / month, with 50mbytes flow. Long term online, report data every few minutes, and the cost of each monitoring point is about 20 yuan a month.