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SK-JMW Vibrating Wire Joint Meter (Fully Sealed, High Water Pressure)
Overview
The Enviko SK-SDM vibrating wire shear displacement meter, also called an interface displacement meter, measures boundary displacement of fill or structures, such as slip along the interface between soil and bedrock, soil and concrete, or soil and other media. It is suited to measuring shear offset and relative settlement between embankments, core walls, slope protection or fill and their foundation surfaces. A built-in temperature sensor records the temperature at the installation point, and a smart ID chip can be fitted on request.
Key Features
- Measures slip and relative settlement at material interfaces
- Five ranges from 25 to 200 mm
- 0.025% FS resolution, ±0.1% FS accuracy
- Waterproof to 0.5 MPa (up to 3 MPa on custom versions)
- Built-in temperature sensor; optional smart ID chip
Applications
- Interfaces between soil and bedrock
- Interfaces between soil and concrete, such as core walls and cut-off walls
- Embankments and slope protection on their foundations
- Earth-rock dams
Specifications
Parameter Specification Models SK-SDM-25, SK-SDM-50, SK-SDM-100, SK-SDM-150, SK-SDM-200 Standard range 25, 50, 100, 150, 200 mm Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom versions) Insulation resistance ≥ 50 MΩ -
SK-SJM Vibrating Wire Surface Joint Meter / Crack Meter (Standard)
Overview
The Enviko SK-SJM vibrating wire surface joint meter, also known as a crack meter, is mounted on the surface of a structure for long-term monitoring of the opening and closing of surface cracks or joints in harsh environments. Universal joints at both ends accommodate a degree of shear displacement. A built-in temperature sensor records the temperature at the installation point.
Key Features
- Surface mounting on brackets fixed either side of the crack or joint
- Universal joints at both ends tolerate some shear displacement
- Seven ranges from 25 to 300 mm
- 0.025% FS resolution, ±0.1% FS accuracy
- Built-in temperature sensor
Applications
- Surface cracks and joints on dams, bridges, tunnels and buildings
- Expansion joints between structural blocks
- Cracks in rock faces and retaining walls
Specifications
Parameter Specification Models SK-SJM-25, SK-SJM-50, SK-SJM-100, SK-SJM-150, SK-SJM-200, SK-SJM-250, SK-SJM-300 Standard range 25, 50, 100, 150, 200, 250, 300 mm Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 0.5 MPa Insulation resistance ≥ 50 MΩ -
SK-EJM Vibrating Wire Embedded Joint Meter
Overview
The Enviko SK-EJM vibrating wire embedded joint meter is installed inside structures for long-term monitoring of the opening and closing of internal cracks or joints in harsh environments. Universal joints at both ends accommodate a degree of shear displacement. A built-in temperature sensor records the temperature at the installation point.
Key Features
- Designed for embedding inside concrete structures
- Universal joints at both ends tolerate some shear displacement
- Five ranges from 25 to 200 mm
- Waterproof to 1 MPa (up to 3 MPa on custom versions)
- 0.025% FS resolution, ±0.1% FS accuracy
- Built-in temperature sensor
Applications
- Construction and contraction joints in concrete dams
- Internal cracks in concrete structures
- Joints between concrete and bedrock
Specifications
Parameter Specification Models SDF-25, SDF-50, SDF-100, SDF-150, SDF-200 Standard range 25, 50, 100, 150, 200 mm Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 1 MPa (up to 3 MPa on custom versions) Insulation resistance ≥ 50 MΩ -
SK-DMP-(2/3/4/5/6) Vibrating Wire Multi-Point Extensometer
Overview
The Enviko SK-DMP series multi-point extensometers are installed directly in boreholes to monitor deformation or settlement across multiple slip surfaces and zones. Apart from the rod protection tubes and anchors, the instruments are made entirely of stainless steel. They offer high accuracy, a simple and shock-resistant construction, easy installation and stable long-term readings, and support long-distance transmission and automated monitoring. A built-in temperature sensor records the temperature at the installation point, and a smart ID chip can be fitted on request.
Key Features
- 2 to 6 measuring points in one borehole (borehole diameter ≥ 130 mm)
- Stainless steel construction, except rod protection tubes and anchors
- Waterproof to 2 MPa (up to 3 MPa on custom versions)
- High accuracy with stable long-term readings
- Good shock resistance and simple installation
- Long-distance signal transmission and automated monitoring
- Built-in temperature sensor; optional smart ID chip
Applications
- Hydropower and water-conservancy projects
- Mines and underground caverns
- Railways and highways
- Slopes
Specifications
Parameter Specification Models SK-DMP-2, SK-DMP-3, SK-DMP-4, SK-DMP-5, SK-DMP-6 Measuring points 2–6 Standard range 25, 50, 100, 150, 200, 250, 300 mm Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 2 MPa (up to 3 MPa on custom versions) Insulation resistance ≥ 50 MΩ Dimensions (Ø × L) 2–4 points: 90 × 545 mm; 5–6 points: 106 × 545 mm Borehole diameter ≥ 130 mm -
SK-DM0 Vibrating Wire Displacement Meter
Overview
The Enviko SK-DM0 vibrating wire displacement meter is widely used for displacement monitoring of foundations, dams and other geotechnical structures. The vibrating wire sensor operates in a resonant state, which gives small hysteresis and creep errors, a wide operating temperature range and strong immunity to interference, making it suitable for harsh environments. A built-in temperature sensor records the temperature at the measuring point, and a smart ID chip can be fitted on request.
Key Features
- Resonant vibrating wire sensor with low hysteresis and creep error
- Strong immunity to electrical interference; suitable for long cable runs in harsh environments
- Eight ranges from 12 to 300 mm
- 0.025% FS resolution, ±0.1% FS accuracy
- Stainless steel or invar transfer rods available
- Built-in temperature sensor; optional smart ID chip
Applications
- Foundation displacement monitoring
- Dam displacement monitoring
- Other geotechnical structures
Specifications
Parameter Specification Models SKW-12, SKW-25, SKW-50, SKW-100, SKW-150, SKW-200, SKW-250, SKW-300 Standard range 12, 25, 50, 100, 150, 200, 250, 300 mm Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 0.5 MPa Insulation resistance ≥ 50 MΩ -
SK-DWP Vibrating Wire Displacement Meter (High Water Pressure)
Overview
The Enviko SK-DWP vibrating wire displacement meter is developed specifically for pumped-storage hydropower projects. It is built for high-head, harsh conditions such as pumped-storage plants and surge shafts, and every unit is factory-rated waterproof to 2 MPa. The resonant vibrating wire sensor gives small hysteresis and creep errors, a wide operating temperature range and strong immunity to interference. A built-in temperature sensor records the temperature at the measuring point, and a smart ID chip can be fitted on request.
Key Features
- Every unit factory-rated waterproof to 2 MPa; up to 3 MPa on custom versions
- Designed for pumped-storage plants and surge shafts
- Low hysteresis and creep error from the resonant vibrating wire sensor
- Strong immunity to electrical interference
- 50% overload capacity
- Eight ranges from 12 to 300 mm
- Built-in temperature sensor; optional smart ID chip
Applications
- Pumped-storage hydropower plants
- Surge shafts and other high-head hydraulic structures
- Foundations, dams and other geotechnical structures under high water pressure
Specifications
Parameter Specification Models SKW-12, SKW-25, SKW-50, SKW-100, SKW-150, SKW-200, SKW-250, SKW-300 Standard range 12, 25, 50, 100, 150, 200, 250, 300 mm Overload capacity 50% Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 2 MPa (up to 3 MPa on custom versions) Insulation resistance ≥ 50 MΩ -
SK-IPC Vibrating Wire Interface Pressure Cell
Overview
The Enviko SK-IPC vibrating wire interface pressure cell measures soil stress inside earth-rock dams, embankments, slopes, subgrades, retaining walls, tunnels and similar structures. Its compact 160 × 160 mm body suits installations where a full-size pressure cell will not fit. It works reliably in harsh environments, with good accuracy and sensitivity, excellent waterproofing and long-term stability.
Key Features
- Compact 160 × 160 × 30 mm design
- Nine ranges from 0.35 to 7 MPa
- 0.025% FS resolution, ±0.1% FS accuracy
- Excellent waterproofing and long-term stability for harsh environments
- Built-in temperature sensor and smart ID chip available on request
Applications
- Earth-rock dams and embankments
- Slopes and subgrades
- Retaining walls
- Tunnels
Specifications
Parameter Specification Standard range 0.35, 0.7, 1, 2, 3, 4, 5, 6, 7 MPa Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature sensitivity ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom versions) Insulation resistance ≥ 50 MΩ Dimensions (L × W × H) 160 × 160 × 30 mm -
SK-EP Vibrating Wire Earth Pressure Cell
Overview
The Enviko SK-EP vibrating wire earth pressure cell measures the contact pressure of fill against retaining walls, bedrock and other boundaries, as well as earth pressure within fill, embankments and soft foundations. An extra-thick back plate reduces the effect of point loads. A built-in temperature sensor records the temperature at the installation point.
Key Features
- Ten ranges from 0.35 to 7 MPa
- Extra-thick back plate to reduce point-load effects
- High accuracy, high sensitivity and long-term stability
- Excellent waterproofing for harsh environments
- 0.025% FS resolution and 30% overload capacity
- Built-in temperature sensor
Applications
- Contact pressure behind retaining walls
- Pressure on bedrock and foundation surfaces
- Earth pressure in fill and embankments
- Soft foundations and dams
Specifications
Parameter Specification Models SK-EP-0.35 / SK-EP-0.5 / SK-EP-0.7 / SK-EP-1 / SK-EP-2 / SK-EP-3 / SK-EP-4 / SK-EP-5 / SK-EP-6 / SK-EP-7 Rated range 0.35 / 0.5 / 0.7 / 1 / 2 / 3 / 4 / 5 / 6 / 7 MPa Overload capacity 30% Resolution 0.025% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature accuracy ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom models) Insulation resistance ≥ 50 MΩ Dimensions (L × W × H) 600 × 230 × 25 mm -
SK-AR Vibrating Wire Anchor Rod Stress Meter
Overview
The Enviko SK-AR vibrating wire anchor rod stress meter monitors stress changes in anchor rods or reinforcing bars in concrete and other structures. Its ends are welded into the anchor rod being monitored, or machined into threaded connections to the customer’s dimensions. Several meters can be installed along one rod in a fully grouted borehole. A built-in temperature sensor records the temperature at the installation point.
Key Features
- High accuracy, high sensitivity and long-term stability
- Excellent waterproofing for harsh environments
- Long-distance signal transmission
- Weld-in or threaded connection, made to the customer’s rod dimensions
- Rod diameters from 12 to 40 mm
- Built-in temperature sensor
Applications
- Rock bolts and anchor rods in tunnels and underground works
- Anchor rods on slopes and in foundations
- Reinforcing bars in concrete structures
Specifications
Parameter Specification Models SK-AR-300 / SK-AR-400 / SK-AR-500 / SK-AR-600 / SK-AR-700 Rated range 300 / 400 / 500 / 600 / 700 MPa Overload capacity 30% Resolution 0.05% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature accuracy ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom models) Insulation resistance ≥ 50 MΩ Rod diameter 12, 14, 16, 18, 20, 22, 25, 28, 32, 36, 40 mm -
SK-RB Vibrating Wire Rebar Stress Meter
Overview
The Enviko SK-RB vibrating wire rebar stress meter monitors stress changes in reinforcing bars or anchor rods in concrete and other structures. Its ends are welded into the rebar being monitored, or machined into threaded connections to the customer’s dimensions for easy installation on site. A built-in temperature sensor records the temperature at the installation point, and a smart chip can be added on request.
Key Features
- High accuracy, high sensitivity and long-term stability
- Excellent waterproofing for harsh environments
- Long-distance signal transmission
- Weld-in or threaded connection, made to the customer’s bar dimensions
- Bar diameters from 12 to 40 mm
- Built-in temperature sensor; optional smart chip
Applications
- Reinforcing bars in concrete structures and buildings
- Bridges, tunnels, foundations and hydraulic structures
- Anchor rods in boreholes
Specifications
Parameter Specification Models SK-RB-300 / SK-RB-400 / SK-RB-500 / SK-RB-600 / SK-RB-700 Rated range 300 / 400 / 500 / 600 / 700 MPa Overload capacity 30% Resolution 0.05% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature accuracy ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom models) Insulation resistance ≥ 50 MΩ Bar diameter 12, 14, 16, 18, 20, 22, 25, 28, 32, 36, 40 mm -
SK-AB Vibrating Wire Anchor Bolt Load Cell
Overview
The Enviko SK-AB vibrating wire anchor bolt load cell, also called a bolt stress meter, measures bolt load and its changes online. It is used to monitor bolt preload and current stress in shield tunnel segment bolts, steel structure bolts and post-tensioned prestressed anchors. A built-in temperature sensor records ambient temperature, and a smart chip can be added on request.
Key Features
- Direct measurement of bolt preload, more accurate than controlling preload by torque
- Rated capacities of 200, 500, 1000 and 1500 kN
- 50% overload capacity
- Online, continuous monitoring of load changes
- Built-in temperature sensor; optional smart chip
Applications
- Shield tunnel segment fixing bolts
- Steel structure bolted connections
- Post-tensioned prestressed anchors
Specifications
Overview
The Enviko SK-AB vibrating wire anchor bolt load cell, also called a bolt stress meter, measures bolt load and its changes online. It is used to monitor bolt preload and current stress in shield tunnel segment bolts, steel structure bolts and post-tensioned prestressed anchors. A built-in temperature sensor records ambient temperature, and a smart chip can be added on request.
Key Features
- Direct measurement of bolt preload, more accurate than controlling preload by torque
- Rated capacities of 200, 500, 1000 and 1500 kN
- 50% overload capacity
- Online, continuous monitoring of load changes
- Built-in temperature sensor; optional smart chip
Applications
- Shield tunnel segment fixing bolts
- Steel structure bolted connections
- Post-tensioned prestressed anchors
Specifications
Parameter Specification Models SK-AB-20 / SK-AB-50 / SK-AB-100 / SK-AB-150 Rated capacity 200 / 500 / 1000 / 1500 kN Overload capacity 50% Resolution 0.05% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature accuracy ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom models) Insulation resistance ≥ 50 MΩ -
SK-AC Vibrating Wire Anchor Cable Load Cell
Overview
The Enviko SK-AC vibrating wire anchor cable load cell monitors the load on anchor cables, rock anchors, anchor bolts and arch supports, as well as other heavy loads. Each cell contains 4 to 6 high-precision vibrating wire sensors that together measure the total load. A built-in temperature sensor records ambient temperature, and a smart chip can be added on request.
Key Features
- Rated capacities from 1000 kN (100 t) to 5000 kN (500 t)
- 4 or 6 vibrating wire sensors for an accurate total-load reading
- 50% overload capacity
- Fully waterproof, sealed design with good long-term stability
- Built-in temperature sensor; optional smart chip
- Suited to harsh environments
Applications
- Prestressed anchor cables on rock slopes
- Rock anchors and anchor bolts in hydraulic and concrete structures
- Bridges
- Arch supports and other heavy-load monitoring
Specifications
Model Rated capacity Vibrating wires SK-AC-100 1000 kN (100 t) 4 SK-AC-150 1500 kN (150 t) 4 SK-AC-200 2000 kN (200 t) 4 SK-AC-250 2500 kN (250 t) 6 SK-AC-300 3000 kN (300 t) 6 SK-AC-350 3500 kN (350 t) 6 SK-AC-400 4000 kN (400 t) 6 SK-AC-500 5000 kN (500 t) 6 Parameter Specification Overload capacity 50% Resolution 0.05% FS Non-linearity ≤ 0.5% FS (linear); ≤ 0.1% FS (polynomial) Accuracy ±0.1% FS Temperature range −20 °C to +80 °C Temperature accuracy ±0.1 °C Water pressure resistance 0.5 MPa (up to 3 MPa on custom models) Insulation resistance ≥ 50 MΩ
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