基于C8051F120的可燃气探测器的设计

Design of Combustible Gas Detector Based on C8051F120

摘要:

日常生产和生活中经常需要对可燃气的浓度进行监控,以往采用的基于半导体传感器的可燃气探测器响应速度慢,测量精度低,提出一种基于催化燃烧型传感器和微控制器设计的可燃气探测器；以C8051F120微控制器为核心,采用惠斯通电桥放大传感器的输出信号,并采用C8051F120的ADC模块将模拟信号转换成数字信号,同时采用微控制器控制继电器,实现报警输出；最终将可燃气的浓度信息通过C8051F120的UART模块,结合MAX485搭建的通信电路使用MODBUS协议发送出去；在20 ℃、标准大气压条件下,分别通20LEL、50LEL、80LEL的甲烷(流量均为1 L/min),探测器测得的结果分别为21LEL、50LEL、77LEL；实验结果表明,文章设计的探测器精度高、响应速度快、稳定性好,具有很高的实用价值。

Abstract:

The monitoring of the density of combustible gas is usually needed in daily production and life. The old detector based on semiconductor sensor has disadvantages, such as low response speed, low measurement accuracy. Propose a detector based on catalytic combustion sensor and MCU. The detector uses C8051F120 as the core MCU, and Wheatstone bridge to amplify the output signal of the sensor. The signal of Wheatstone bridge is then processed by the ADC module of C8051F120, besides this, C8051F120 controls the relay and achives the alarm output. At last, the density of the combustible gas is transferred to the upper monitor by the UART part of the MCU and the digital communiction circiut based on MAX485 with MODBUS protocol. In the conditions of 20℃,standard atmospheric, aerate the detector with methane in the concentration of 20LEL,50LEL,80LEL respectively, the measurement result of the detector is 21LEL,50LEL,77LEL. The experimental results show that the dector has high precision,fast response,good stability and very high practical value.