Dam Monitoring During Construction
A hydroelectric dam under construction in Serbia required monitoring of several environmental and structural properties to guarantee long-term strength and stability. Therefore the dam’s construction engineers put forth a proposal for a large number of geotechnical sensors to be installed and used during construction. These sensors included vibrating wire piezometers, joint meters, fill extensometers, and strain gages.
Each sensor needed to interface with a universal data logger as part of a long-term logging solution. Additionally, the engineers specified that their desired monitoring solution needed to have a large number of vibrating wire sensor inputs, compatibility with a SCADA system, and the ability for expansion.
dataTaker DT85G Geo Logger x2
dataTaker Channel Expansion Module (CEM20) x6
• Fill extensometers
• Strain gauges
• Flow meters
Technicians chose the dataTaker DT85G because of its compatibility with vibrating wire sensors, its large number of inputs, and its versatile communications capabilities. The dataTaker can monitor a wide variety of geotechnical data logging parameters including slope stability and subsidence, and is used in geotechnical monitoring applications such as dam wall monitoring, tunnel and mining excavation, ground water studies, tunnel wall monitoring and structural monitoring.
Ideal for all geotechnical data logging applications, the DT85G model has 16 analog channels capable of measuring up to 16 vibrating wire strain gages with thermistors or 48 vibrating wire strain gages without thermistors. Input channel count can be expanded simply by connecting dataTaker Channel Expansion Modules (CEM20s). In this example, two DT85G data loggers are each paired with three CEM20 channel expansion modules allowing for a total of 146 vibrating wire sensors to be distributed throughout the dam structure. If needed, the dataTaker system can be further expanded to connect up to 640 vibrating wire sensors.
Vibrating wire sensors were used due to their ability to provide highly accurate measurements that are not affected by the electrical resistance of long lengths of cable. Connected to the dataTakers, these sensors now provide information about the dam’s stress, fissuring, foundation deformation, uplift, displacement, and seepage flow.
dataTaker DT85G Features
• A cost-effective data logger expandable to 320 4-wire channels, 640 differential or 960 single-ended analog inputs
• Provides excitation for Vibrating Wire and other Geotechnical sensors
• Compatible with all major sensor brands –Slope indicator, RST Instruments, Geokon, Soil Instruments, Roctest, AGI, etc.
• Built-in web and FTP server gives users remote access to logged data, configuration and diagnostics
• Rugged design and construction provides reliable operation in the environmental extremes of geotechnical applications
• Modbus RTU via Serial RS-485 or TCP/IP
Data storage and retrieval can be achieved via USB memory stick, FTP, cell phone, Modbus for SCADA, Ethernet or Web. In this instance, a SCADA system is used to retrieve each sensor’s data from the loggers. There are two methods by which this can be done: either Modbus RTU via RS-485 or Modbus TCP/IP via Ethernet, the latter being the protocol behind the internet, which potentially allows for monitoring worldwide.
The hydroelectric dam now uses the pair of dataTaker data loggers as a key part of this advanced dam monitoring system. The low-cost, low-power dataTaker DT85G is extremely versatile and easy to configure with built-in statistical logging, multiple communication protocols and has sophisticated data management and alarming capabilities.
The dataTaker’s high channel count and built-in support for major vibrating wire sensors provides the ideal data acquisition and monitoring solution for engineers working in the geotechnical environment.
For more information on the dataTaker DT85G Geo Data Logger, or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at www.DataLoggerInc.com.
Computer Aided Solutions, LLC. dba CAS DataLoggers is a distributor of data loggers, paperless recorders and data acquisition equipment.
We have the industry’s most complete selection of data logging equipment, with hundreds of different models from more than 18 manufacturers. With data loggers from 1 to 300 channels we can record temperature, humidity, force/strain, pressure, flow, voltage, current, resistance, vibration and other digital signals, in connection with serial (RS-232/RS-485), CAN/OBD or SDI-12 devices. We sell directly to end users and also work through a network of distributors and resellers throughout the United States, Canada, Central and South America.
8437 Mayfield Rd Unit 104
Chesterland, OH 44026
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