Design of coal mine water level measuring and monitoring system based on wireless sensor networks;

Water-level Monitoring System of Hydropower Station Made of Network Instrument and Computer;

On the basis of development of computer technology,discusses the development of monitoring and control system of coal mine.

This paper introduces the components of the automatic underground drainage monitoring system in the coalmine and the methods for the data collecting and processing, and points out that the drainage monitoring system is the important facility of protecting the safety running of the coalmine.

Based on analyzi ng the current maintaining situation of the monitoring system of Chengzhuang Coal Mine and the causes of the faults, this paper points out that applying P55525-ty pe trunk isolator in the monitoring system can realize the fault isolation succe ssfully and reduce the fault checking time, possessing good social benefit and e conomic benefit.

By analyzing the problems existed in the production safety monitoring system of Longkou Mining Group in Shandong,the technological transformation of design is carried out and the remote monitoring system KJ95N of coal mine is established.

This article designs a kind of urban district heating monitoring and controlling system which uses a combination of GPRS(General Packet Radio Service)、Internet and PLC(Programmable Logic Controller) technologies etc.

Aiming at nonlinearity, time-variation and indetermination of flux control for water measurement system, the good controlling effect cannot be gotten if normal PID method is employed.