High performance combustible gas monitoring system

In order to realize remote monitoring and centralized management of combustible gas. A monitoring system of high performance fuel gas based on RS485 bus communication mode was presented in this paper. The system was composed of center controller and unit controller. The hardware design of unit controller and center controller was introduced, and the software design scheme of the control and communication between each controller were given in this paper. The center controller used Modbus protocol to communicate with the unit controller, to realize the display, storage and query of alarm signal of combustible gas, and complete the automatic zero adjustment, calibration and fault detection of the sensor signal of the unit controller. The unit controller collected the concentration value and temperature value of the combustible gas in real time, but due to effect of temperature, so I used RBF neural network to solve the problem of measuring deviation. The experimental results show that the measurement error is less than 2% LEL, and the alarm error is less than 3% LEL. The presented system has advantages such as easiness of operation, real-time fixing, relativity low cost and a wide prospect of applications.