Geokon Concrete Embedment Strain Gages
Concrete Embedment Strain Gages

These Strain Gages are designed for direct embedment in concrete. It has a 153 mm gage length and 1με sensitivity and is commonly used for strain measurement in foundations, piles, bridges, dams, tunnel linings, etc.
Standard Range 3000 με
Resolution 1.0 με
Accuracy ±0.5% F.S.
Nonlinearity <0.5% F.S.
Temperature Range -20°C to +80°C
Active Gauge Length 153mm
Crackmeter

The Crackmeter is intended to measure movement accross surface cracks and joints. It is installed by grouting, bolting, or bonding two threaded anchors (with ball joints) on opposite sides of the crack and then attaching the ends of the gage to the anchors.
Standard Ranges 12.5, 25, 50, 100, 150 mm
Resolution 0.025% F.S.
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range -20°C to +80°C
Active Gauge Length 325, 333, 379, 543, 685 x 8mm
Magnetic Extensometer

The Magnetic Extensometer is designed to measure settlement or heave of soft ground under the influence of loading or unloading due to the construction of embankments, fills, buildings, foundations, and structures. A probe is lowered inside a telescoping guide tube to detect and measure the position of magnetic anchors located around the guide tube at various depths along the borehole or within the fill. Plate anchors are used in fill and “spider” anchors in boreholes.
Standard Range unlimited (cable lengths 30, 150 m)
Resolution 1 mm
Accuracy ±3 mm
Temperature Range -30°C to +80°C
Borehole Size 102 to 152 mm
Probe Length x Diameter 178 x 19 mm
Standard Piezometers

The Standard Piezometers is designed to measure fluid pressures such as ground water elevations and pore pressures when buried directly in embankments, fills, etc. Also for installation inside boreholes, observation wells and standard (>19 mm diameter) piezometer riser pipe.
Standard Ranges 350, 700 kPa; 1, 2, 3 Mpa
Over Range 2 x rated pressure
Resolution (min) 0.025% F.S.
Accuracy ±0.1% F.S.
Linearity <0.5% F.S.
Temperature Range -20°C to +80°C
Length x Diameter 133 x 19.1 mm
Weir Monitor

The Weir Monitor is a water level monitoring system that uses a vibrating wire force transducer to provide a highly stable and sensitive means of monitoring water levels. The main component is a cylindrical weight suspended from the force transducer. The cylindrical hangs partially submerged in the water whose level is to be monitored. As the water level changes the changing buoyancy force on the cylinder acts directly on the vibrating wire transducer and alters its tension and hence its resonant frequency.
Standard Ranges 150, 300, 600, 1500 mm
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S.
Temperature Range -20°C to +80°C
Length x Diameter (transducer) 165 x 25 mm
Settlement System

The Settlement System is designed for the remote measurement of surface or subsurface settlement in fills, surcharges, dams, embankment, etc. A borehole is drilled which allows a pressure transducer to be anchored to solid ground below the area of settlement. A fluid filled tube extends upward connecting the tranducer to a reservoir which is located in the moving strata or fill. The measurement of fluid pressure indicates the elevation difference between the sensor and the reservoir. This design eliminates the need for long liquid filled tubes.
Standard Ranges 7, 17, 35 mm
Resolution 0.025% F.S.
Sensor Accuracy ±0.1% F.S.
Temperature Range -20°C to +80°C
Length x Diameter (reservoir) 305 x 60 mm
(sensor) 191 x 35 mm
Earth Pressure Cell

The Earth Pressure Cell are designed to measure total pressure in earth fills and embankments. All cell consist of two circular stainless steel plates welded together around their periphery and spaced apart by a narrow cavity filled with de-aired oil. Changing earth pressure squeezes the two plates together causing a corresponding increase of fluid pressure inside the cell.
Standard Ranges 70, 170, 30, 700 kPa; 1, 2, 3, 5, 7.5, 20 MPa
Over Range 150% F.S. (maximum)
Resolution 0.025% F.S.
Accuracy ±0.1% F.S.
Temperature Range -20°C to +80°C
Height x Diameter (transducer) 6 x 230 mm
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