Settlement Sensors
 

Photo of 4600

  Model 4600 Settlement Sensor
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
Sensitivity 0.025% F.S.
Accuracy ±0.25% F.S. to ±1% F.S.
Temperature Range –20°C to +80°C
Length x Diameter

(Reservoir) 305 x 60 mm
(Sensor) 191 x 35 mm

¹Other ranges available on request.


Photo of 4650   Model 4650 Settlement Sensor
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
Sensitivity

±0.025% F.S.

Accuracy ±0.25% F.S. to ±1% F.S.
Temperature Range –20°C to +80°C
Length x Diameter (Reservoir) 152 x 51 mm
(Sensor) 191 x 35 mm
¹Other ranges available on request.


Photo of 4651   Model 4651 Settlement Profiler
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 Ranges 7 m (other ranges available on request)
Sensitivity 0.025% F.S. (1 to 2 mm)
Accuracy ±0.25% F.S.
Cable Reel Capacity 100 m
Temperature Range –20°C to +80°C
Length x Diameter (Probe) 203 x 35 mm
(Reel) 178 x 610 mm


Photo of 4675   Model 4675 High Sensitivity Settlement Sensor
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 ±0.02mm (±0.001in.) are detectable.

Specifications  
Standard Ranges¹ 150, 300, 600 mm
Sensitivity 0.02% F.S.
Accuracy ±0.1% F.S.
Temperature Range –20°C to +80°C
Dimensions Depends on Range
¹Other ranges available on request