Description
Model: EDJ-40V
The EDJ-40V Crack/Joint Meter is a precision instrument designed to monitor surface cracks and structural joint movement in concrete, rock, and masonry. It employs a vibrating wire displacement transducer (EDE-VXX) to accurately measure variations in the width of a joint or crack over time.
The transducer is mounted between groutable anchor plates fixed on opposite sides of the joint or crack. The sensor converts mechanical movement into a stable and repeatable frequency output, ensuring reliable long-term performance in harsh environmental conditions. Both uniaxial and biaxial configurations are available, depending on the required monitoring direction.
A waterproof version of the EDJ-40V allows use in submerged or high-moisture environments, such as dam faces or hydraulic structures, maintaining full functionality even under deep-water pressure.
Specifications
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Instrument type: Crack / Joint Meter
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Sensor type: Vibrating wire
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Configuration: Surface-mount installation with groutable anchors; uniaxial or biaxial design
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Application: Monitoring crack width or joint opening on structures such as dams, bridges, retaining walls, and tunnels
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Measured parameter: Crack / joint displacement
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Measuring range: 15 mm, 25 mm, 50 mm (custom options available)
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Testing & calibration: Thermal cycling (-20 °C to +80 °C), thermal variation data validation, accuracy and waterproof testing for WP model
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Key features:
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Robust stainless-steel construction for long-term durability
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Waterproof version suitable for underwater or high-humidity environments
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Compatible with manual and automatic vibrating wire readout units
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Stable, low-drift signal ideal for long-term monitoring programs
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Protection: IP-68 — water-resistant up to 40 m water column; waterproof version up to 100 m water column
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Dimensions: Depend on measuring range
