Automatic Settlement Monitoring Systems


		Introduction The AMEC System is used to measure vertical settlement at up to 8 selected horizons within a borehole and is an automatic magnetic extensometer, rather than the conventional manually lowered sensor and cable assembly. The system has the ability to ensure reliable and repeatable measurements of greater accuracy than by manual measurement (± 0.5mm). These measurements can be conducted over long periods of time at locations requiring only limited operator access. The measurement system is contained within an IP68 sealed stainless steel housing fitted to the collar of the extensometer casing.
		Model Options The system can be supplied in three configurations depending on the requirements of the site to be monitored and whether vibrating wire piezometers are installed in conjunction with the settlement extensometer. The Model 4775S system has on-board non-volatile data storage and programmable features providing maximum flexibility for data collection and recovery of measured data. An industry standard RS232 interface provides a variety of options for system control and data management while a number of power supply options are available for convenience of installation.
		The Model 4775A has been designed to operate in conjunction with an external data logger and presents settlement data via eight analogue voltage outputs to the logger. All timekeeping, data storage and data recovery functions are controlled by the data logger, which requires three dedicated I/O lines for communication to the AMEC system. The Model 4775V system has on-board non-volatile data storage and programmable features providing maximum flexibility for data collection and recovery of measured data. The system can also record additional data from up to 8 vibrating wire piezometers. An industry standard RS232 interface provides a variety of options for system control and data management while a number of power supply options are available for convenience of installation.