Photo of Model 4600.

Settlement Sensors

Model 4600

The Model 4600 Settlement System is designed for the remote measurement of surface or subsurface settlement in fills, surcharges, dams, embankments, 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 transducer 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. Systems capable of measuring at multiple levels are also available (please contact Geokon for details).

Specifications
Standard Ranges¹ 7, 17, 35 m
Resolution 0.025% F.S.
Sensor Accuracy² 0.1% F.S.
Temperature Range −20°C to +80°C
Length × Diameter 305 × 60 mm (reservoir), 191 × 35 mm (sensor)

¹Other ranges available on request.

²Laboratory accuracy. Total system accuracy is subject to site-specific variables.

Photo of Model 4650.

Settlement Sensors

Model 4650

The Model 4650 Settlement System uses a Pressure Transducer attached to a settlement plate located in the settling ground. The sensor is connected, via two fluid-filled tubes extending laterally, to a reservoir located on firm ground away from the area of anticipated movement. Fluid pressure within the tubes is sensed by the transducer which provides a measure of the elevation difference between the sensor and the reservoir. The tubes are flushable. The closed loop vented transducer / reservoir system is not influenced by barometric pressure.

Specifications
Standard Ranges¹ 7, 17 m
Resolution 0.025% F.S.
Sensor Accuracy² 0.1% F.S.
Temperature Range −20°C to +80°C
Length × Diameter 152 × 51 mm (reservoir), 191 × 35 mm (sensor)

¹Other ranges available on request.

²Laboratory accuracy. Total system accuracy is subject to site-specific variables.

Photo of Model 4651.

Settlement Profilers

Model 4651

The Model 4651 Settlement Profiler consists of a pressure transducer inside a torpedo which is connected by a long liquid filled tube to a liquid reservoir. The torpedo is pulled through a pipe buried in a fill, surcharge, embankment, etc. The transducer gives a measure of the elevation profile of the pipe relative to the reservoir located on stable ground. The liquid tube is stored on a reel.

Specifications
Standard Range¹ 7 m
Resolution 0.025% F.S.
Sensor Accuracy² 0.1% F.S.
Cable Reel Capacity 100 m
Temperature Range −20°C to +80°C
Length × Diameter 203 × 35 mm (probe), 178 × 610 mm (reel)

¹Other ranges available on request.

²Laboratory accuracy. Total system accuracy is subject to site-specific variables.

Photo of Model 4675.

High Sensitivity Settlement Sensors

Model 4675

The Model 4675 Settlement Monitoring System consists of a series of vessels containing liquid level sensors interconnected by a liquid filled tube. A reference vessel is positioned at a stable bench mark location with additional vessels positioned at different locations at approximately the same elevation. Differential settlement or heave between any vessel and the reference vessel results in an apparent rise or fall of the liquid level in that vessel. This system is particularly suitable for critical situations where high resolutions are required. Elevation changes of as little as ±0.02 mm (±0.001 in.) are detectable.

Specifications
Standard Ranges¹ 100, 150, 300, 600 mm
Resolution 0.025% F.S.
Sensor Accuracy² 0.1% F.S.
Temperature Range −20°C to +80°C (using antifreeze solutions)
Dimensions depends on range

¹Other ranges available on request.

²Laboratory accuracy. Total system accuracy is subject to site-specific variables.

Please Note: Geokon maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice.