Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

The accident and disaster by leakage of the gas in the underground space is often occurred by increase of the confined space and carelessness of gas users in this country. But there are no proper monitoring system yet. Therefore, with the observation of the factor affecting the confined space, and using proper sensors, we designed and made a trial product of the environmental monitoring system. This computerized system is composed of three parts, the central monitoring part, the transmission part and the gas sensing part. In this system, personal computer can read the data connected with 256 sensors. Additionally, transmission method can also be connected with wire and wire-less. This system is characterized as follows; 1) The connection between PC - Host controller - Slave controller - Sensor board is designed to fit modem RS-232, RS-485 which is the standard interfsce. 2) The Gas sensing part in the closed space and central monitoring part in office are connected by a wire-less transmission method using RF modem.