Application of GPRS Remote Meter Reading System for water, electricity and gas

　　At present, the three meter reading of water meter, electricity meter and gas meter of many urban residents is the method of monthly household or outdoor meter reading by staff. Enterprises not only need to be equipped with a large number of meter reading personnel, but also waste a lot of human, material and financial resources, which is not conducive to the cost saving of enterprises.

　　With the improvement of people's living standards and the continuous increase of modern intelligent residential areas, the requirements for the level of property management are higher and higher, which requires improving the efficiency of meter reading of water, electricity and gas. Therefore, we adopt the automatic remote monitoring and meter reading system in the design to monitor and manage the water, electricity and gas in the modern intelligent residential district.

　　1、 Composition and function of remote three meter reading system

　　1.1 composition of remote three meter reading system

　　The system is mainly composed of enterprise management computer, community host, GPRS wireless transmission system, terminal system, alarm, electric valve, sensor and so on. The system block diagram is shown in Figure 1.

　　1) The enterprise management computer is the control center of the three meter remote meter reading system. The management software adopts the method of modular programming. Each type of I / O device has an I / 0 device driver module. Various functions can be customized according to the requirements of each user, and new functions can be expanded according to the changes of the situation. Enterprise management computers are generally installed in the computer room center of water, power and gas companies.

　　2) The cell hosts have a unique code, which is set by the manufacturer. This code is conducive to management.

　　3) The basic function of GPRS general wireless packet service is to provide packet transfer service between the terminal and the router of the computer communication network. Packet users can maintain a permanent virtual connection on the network, that is, they can always connect to the network without affecting the network capacity. GPRS allows users to send and receive data in the end-to-end packet transfer mode, Without using the network resources of circuit switching mode, it provides an efficient and low-cost wireless packet data service. Therefore, GPRS is especially suitable for intermittent, sudden or frequent, small amount of data transmission, as well as occasional large amount of data transmission, so it is especially suitable for three meter data wireless transmission.

　　Block diagram of GPRS Remote Meter Reading System for three meters of water, electricity and gas

　　Figure 1 block diagram of GPRS Remote Meter Reading System for water, electricity and gas meters

　　4) Intelligent terminals can be installed indoors or in the public space of the building. They are directly connected with water, electricity and gas meters or sensors. They can carry out signal processing and data acquisition, and complete control.

　　5) The electric valve is installed in the public space of the corridor or in the kitchen. When receiving the alarm signal or emergency affairs such as water leakage and fire, it can turn off the valves of water, electricity and gas.

　　6) The sensor is installed inside the meter to convert the signal and convert the number of turns of the dial into pulse signal output.

　　1.2 functions of automatic monitoring meter reading system

　　1.2.1 enterprise management computer

　　Issue various operation commands for I / 0 equipment, including data acquisition and control, receive and display data, receive signals from each cell host, display and archive, and manage various system equipment.

　　1.2.2 cell host

　　The communication protocol conversion between the management computer and the intelligent terminal and the inspection and scanning of the intelligent terminal are completed through the GPRS system.

　　1.2.3 GPRS wireless transmission

　　It can complete the transmission of metering signals of water, electricity and gas meters and the transmission of control signals of electric valves.

　　1.2.4 intelligent terminal

　　It is the terminal equipment of the system, which is directly connected with various I / O equipment. It adopts the building block combination structure. Different combination methods are selected according to different situations. Each intelligent terminal module has several I / 0 interfaces, which are respectively connected with equipment (such as pulse meter, electric valve, relay, AC contactor, alarm, etc.).

　　2、 Advantages of GPRS Remote Meter Reading System for water, electricity and gas

　　1) It has rich functions and strong comprehensiveness, and can realize the functions of automatic billing, equipment control, alarm and data transmission. The electric control valves equipped with water, electricity and gas can alarm and handle in time in case of user failure. It can complete the collection, processing and storage of various data in each community, and can be transmitted to power, water and gas companies.

　　2) As the flow, pressure, temperature and other data of water, electricity and gas are important technical data of the management offices of various relevant departments, in the past, the acquisition of relevant data can only rely on manual processing. Each station in the city adopts special personnel to patrol and run several points a day to record the relevant data. The stations in the suburbs need to be held by people and transmit the data by telephone. The data transmission is slow and the error rate is high, which greatly increases the cost and causes great inconvenience to the management and maintenance. According to the requirements of the current situation, the developed system transmits data through GPRS. It has no distance limit, wide coverage and is not limited by terrain and weather. Its advantage is that it can make up for the distance and environment problems of wireless system.

　　3) Enhance use security. Now people use water, electricity and gas, and various safety accidents occur frequently. People pay more and more attention to safety. This system can control the water, electricity and gas valves of users in the community through the community control center, deal with emergencies and protect the lives and property of users in the community.

　　4) Reasonable price and convenient maintenance. The maintenance cost of this system is relatively low.

　　5) The system can improve the efficiency of meter reading. Operating enterprises can reduce the number of meter reading and charging personnel, shorten the time of capital recovery, reduce the labor intensity of meter reading and charging personnel, avoid the inconvenience to residents caused by meter reading and charging, expand the service area of meter reading and charging personnel, improve work efficiency and reduce enterprise costs.

　　3、 Conclusion

　　GPRS technology is very suitable for the three meter reading remote system of water, electricity and gas. Compared with the traditional way, the advantages of using GPRS Technology for water, electricity and gas meter reading system are always online, good real-time performance, easy maintenance, reasonable charge and so on. This paper mainly analyzes the composition and function of the developed water, electricity and gas remote meter reading system based on GPRS technology. The utility model not only realizes the functions of real-time monitoring and automation of the gas meter reading system, but also plays an active role in reducing the cost of the gas meter reading and automatic operation, and improving the safety of the gas meter reading system.