Description
Model: EDS-63U / EDS-63D
The EDS-63U / EDS-63D is a mechanical multipoint borehole extensometer (MPBX) developed for long-term monitoring of ground and rock mass deformation. It provides a cost-effective and dependable solution for measuring displacement in underground and surface structures where access to the borehole collar is convenient.
Two configurations are available:
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EDS-63U — for upward-oriented boreholes
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EDS-63D — for downward-oriented boreholes
Measurements are taken manually using a micrometer depth gauge, ensuring precise and repeatable readings without the need for electrical power.
The system consists of multiple anchors grouted at predetermined depths within a borehole, each connected to a reference head assembly through fiberglass or stainless-steel connecting rods. The rods are housed in heavy-duty protective sheaths, allowing free axial movement while protecting the system from external damage. Displacement over time is determined by comparing subsequent readings with the initial baseline measurement.
Specifications
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Instrument type: Multipoint Borehole Extensometer
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Sensor type: Mechanical
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Configuration: Available in 3-point and 6-point versions; manual readout via micrometer gauge
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Application: Monitoring deformation and movement in tunnels, slopes, foundations, underground caverns, mines, and deep excavations
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Measured parameter: Deformation / settlement / heave
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Range: As per project requirement (typical anchor depths configurable)
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Testing / calibration: Not applicable for manual mechanical system
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Key features:
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Suitable for both upward and downward boreholes
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Rugged and economical design
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No electrical components — ideal for remote or simple field setups
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Accurate manual measurement for long-term geotechnical monitoring
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