In this paper, the guard against theft and fire prevention of the industrial installation from long distance and dispersed area has been discussed. When one of some sensors in the industrial site has the alarm signal, the radio in the site can emit the alarm signal. At the almost same time, the signal can be received by radio-receiving center. Then, the signal can be transmitted by single chip micro-computer through telephone lines. Therefore, we can get the alarm signal in the other end of the telephone lines and make decision. It has been proved in practice that the method of wired and radio relay transmission is very useful, efficient and cheap.
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