The Design of Oxygen Content Controller in the Closed Environment

Abstract:

Oxygen content controller in the closed environment contains two parts, master machine and slave machine, of which the master one in the control room can monitor and control the slave ones hanged on it. The master one can not only read the current value of the salve but also control the parameter values and set the upper and lower limits, and the slave one can set its own limits meanwhile. The slave machines monitor the current oxygen content by 4OX2 oxygen sensor, and convert the content signal into digital signal which is conventional to process by the microcontroller.And then the digital signal will be compared with the limit, if less than the lower limit, the relay will open the valve to release oxygen into the air. On the contrary, if more than the upper threshold, the valve will be closed. In addition, the slave machine also has the calibration function and set its own communication address using DIPswitches. The communication between the master and slave is accomplished by the full duplex RS485 through max489 chip.

• Periodical: Applied Mechanics and Materials (Volumes 494-495)
• Pages: 1225-1228
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.494-495.1225
• Online since: February 2014
• Authors: Ying Sun*, Peng Jing, Qing Wen Hou
• Keywords: CityTech 40X2, Mega16, Oxygencontent Controlle, RS485

References

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