Description
Model: EDS-70V / EDS-70P
The EDS-70V / EDS-70P is a multipoint borehole extensometer designed to measure deformation or extension in rock masses over time, either within a single borehole or across multiple adjacent boreholes. The instrument provides accurate and long-term monitoring of subsurface movement, making it ideal for tunnels, powerhouses, deep excavations, slopes, and mining operations.
This system is conceptually similar to the EDS-63U-D, but it features a vibrating wire displacement sensor assembly (EDE-VXX series) available in 50, 100, or 150 mm measuring ranges. The use of multi-core signal cables allows reliable data transmission over extended distances. Data can be collected using a portable readout unit, data logger, or an automated remote acquisition system. Mechanical readout versions are also available for field applications where simplicity and manual measurement are preferred.
Specifications
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Instrument type: Multipoint Borehole Extensometer
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Sensor type: Vibrating wire
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Configuration: Available in two versions — up to 3-point and up to 6-point models, each equipped with VW displacement sensors
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Application: Monitoring ground or rock mass deformation in tunnels, caverns, slopes, foundations, excavations, and mines
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Measured parameter: Deformation / settlement / heave
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Measuring range: 50 mm, 100 mm, 150 mm (per sensor)
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Testing & calibration: Thermal cycling (-20 °C to +80 °C), thermal response verification, accuracy and waterproof tests (for WP model sensors)
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Key features: Suitable for inaccessible or remote installation sites; compatible with manual or automatic data logging systems; long-term stability and precision monitoring
