Research Of Measuring And Controlling Of Carbon Potential In Heat-treating By Microcomputer

Cementite is a very important technics in heat treatment. The processing of cementite relates directly to the quality of products in heat treatment. In the paper, based on the experience of many years and the native Oxygen sensor, and extracting the distillate of foreign Carbon Potential measurer and controller, we develop a Carbon Potential measurer and controller with low cost and high accuracy, more important, which using double MCU (AT89C55) to control the processing of cementite.The system uses double MCU to solve the problem of resource bottleneck in single MCU, realizing the separate of display and measure; uses sharing data memory instead of serial communication between double MCU, successfully solving the problem of disturb in data memory; uses V/F transform module instead of signal filtering, forward amplifier and A/D transformer to realize the separate of two input signal, lowing the cost; use LCD with Chinese language as the interface of machine and man, inducing greatly the memory of complex LED display; provide five channels of relay output and one channel of 4-20MA signal output, satisfying the complex locale control; provide one channel 4-20MA signal output and 485 communication interface to realize the data exchanging with no paper recorder and PC .By the locale application in Wuhan Iron and Steel (Group) Corp. and Dongfeng Mobile Ltd., we improve continuously the performance of the instrument. Finally we reach the expecting goals: the accuracy and stability of the instrument both reaching the design guide. Furthermore, we get the good estimate by customer and establish good fame in heat treatment industry.