The Development And Study Of Verification System For Coal Mine Gas Sensor

The sensor is directly related to the reliability and sensitivity of Coal Mine Safety Monitoring and Control System , and play a important role in monitoring and controlling.In order to guarantee the veracity of measuring,the sensor must be verified periodically according to the verification regulation.This verification device can comprehensively assess the metering performance of sensor,which can effectively play the role of monitoring and controlling for Coal Mine Safety Monitoring and Control System. Under the circumstances, Automatic Verification Device for Coal Mine Gas Sensor are discussed in the paper.The verification principle of coal mine gas sensor is introduced in this paper , and designed the gas loop,the control circuit based on the Single Chip Microcomputer AT89S52 and frequency measurement circuit, when device worked at the manual status. In addition,the serial communication circuit which worked at the automation status is also introduced. Frequency measurement is the core of verification device, so it is focussed research on equal accuracy frequency measurement which widely applied to middle band measurement. In order to realize long-distance data transmission,serial communication software adopted RS-485 protocol. Serial communication software bears great significance in terms of single-chip Microcomputer ,not only did the Single-Chip Microcomputer transmit data to PC port, Single-Chip Microcomputer also was controled by PC. It analyze and save the data by making use of the powerful data processing capability of PC,and it can display the verification result in PC's screen through the Serial communication software,so the worker can know the status of verification and finish appropriate treatment and control.By tesing at laboratary and running at workshop,the system has strong points of easy operation good stability and easy maintenance.The system has strong ability of data processing and anti-interference,as well as high verifing precision.This verification device for coal mine gas sensor provides a practical program for automatical verification.