Foreword 
 Need to monitor the water level in many places in the country. Such as factory reservoirs, irrigation reservoirs, water supply, water towers, river water level. Good water level monitoring is very important. Jinan the Tenda electronics should the user needs to produce a water level monitoring system based on GPRS. The system combines advanced communications technology, automation technology, electronic technology, with the incomparable advantages of real-time online, remote monitoring, wireless control. More suitable for complex terrain, using the remote and mountainous conditions. Can be used in the pool water level monitoring, water tower water level monitoring, water tank level monitoring, reservoir water level monitoring, Hechi water level monitoring. 
 Second, the Introduction 
 1, the system composed of: GPRS data transmission terminals, the water level acquisition module, the water level monitoring software, broadband, SIM card. 
 GPRS data transmission terminals: the terminal built-in GPRS module, capable of receiving the return water level detector water level value, and be able to transfer data to the monitoring center. Field data collection and upload to complete with the water level detector. 
 Acquisition module: the water level water level detection and GPRS terminal connected to the data to the GPRS terminal. 
 Water Level Monitoring Software: Monitoring Software installed on a networked computer to be able to receive the terminals of the data. People in the office to check the water level value. 
 Third, the system functions 
 1, the GPRS data transmission terminal 
 GPRS data transmission terminal can receive the industry-standard design 0 ~ 5V, 4 ~ 20mA signal. The user can configure a variety of sensors for collection of water level, level acquisition. 
 2, the water level in real-time monitoring 
 The water level acquisition module and GPRS data transmission terminal connected to the collection of water level sent to the GPRS data transmission through the serial port terminal. GPRS data transmission terminal in accordance with the communication protocol to read the current water level data transmitted to the SCADA software. People can understand in the computer field level information. 
 3, wireless remote control pump 
 GPRS data transmission terminal built-in relay wireless remote control pump switch when the water level exceeds the lower limit, the administrator in the control room operations monitoring software to wireless remote control pumps. 
 4, pump action feedback master 
 When the pump is turned on or off action, pump run status of GPRS data transmission terminal will upload to the host computer monitoring software, enables administrators to understand the pump current run state. 
 5, switch real-time monitoring 
 GPRS data transmission terminal can access the switch, the switch through the network will be uploaded to the PC monitoring software for real-time monitoring of the switch. 
 6, the voltage and current monitoring 
 GPRS data transmission terminal with industry-standard interface, voltage sensors, current sensors access GPRS data transfer terminal, collecting voltage electric current, the data transmitted through the network to the SCADA software, real-time monitoring of voltage and current. 
 7, the water level limit alarm 
 Can be preset by software monitoring limits to the GPRS data transmission terminal, when the water level value, voltage, current overrun, GPRS data transmission terminal of the alarm information uploaded to the host computer monitoring software. Administrator phone receiver can be set to alarm the short interest. 
 Fourth, review 
 Water level monitoring and control method, but using GPRS technology can not match advantage. Water level capture terminal real-time networking, users can keep abreast of the water level information; people sitting in the office can understand the situation of the remote water level, easy maintenance and management; GPRS Internet traffic accounting is one of the most economical means of transmission; the entire data transmission rely on mobile network, the remote transmission can be implemented in the country, and no wiring between the water level monitoring points with the office, to reduce the water level monitoring project construction costs.