Photo of Model 4600.

Settlement System

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 System

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 flush-able. 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 Profiler

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 System

Model 4675

The Model 4675 High Sensitivity Settlement 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 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.

Photo of the Model 4675OC.

Precision Settlement Monitoring System

Model 4675OC

The Model 4675OC Precision Settlement Monitoring System was designed to measure differential settlements with a very high degree of accuracy and resolution, making it suitable for applications of a highly critical nature where the expected settlements are small. The system uses a 3 inch diameter horizontal open channel pipe, which is half filled with water or antifreeze solution and fixed to the structure or tunnel under observation. Sensors are situated at intervals along the pipe and connected hydraulically to the water in the pipe through short lengths of tubing.

Specifications
Standard Ranges¹ 75 mm
Resolution² 0.025 mm
Accuracy³ ±0.1% F.S.
Temperature Range −30°C to +80°C (using antifreeze solutions below 0°C)
Dimensions depends on range

¹Other ranges available on request.

²The resolution of the system, with the Micro-1000 datalogger, is 0.001 mm.

³Accuracy can be achieved using polynomial calibration constants.

Products

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