Underground » Ventilation, Gas Drainage and Monitoring
This report describes the development and final form of an electronic system designed to monitor underground gas flowmeters. The system is designed to power and communicate with up to 255 devices along a twisted pair cable which may have a length of up to 2 km. The flowmeters may be replaced with other transducers so that the system may also be used to monitor extensiometers, convergence rods or a variety of resistance bridge type sensors. Whilst the system is not electronically fast it enables any sensor to be accessed in 1.5 seconds.
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