Pore pressure sensors

One of the most widely used measurement techniques in dike reinforcement and geotechnical applications is the use of pore pressure sensors. These sensors are placed underground and are shielded to react only to surrounding groundwater, not to water levels at other depths.

Dit is onze waterspanningsmeter

Stability assessments and dike monitoring

The data from these sensors is essential for stability measurements and slope/dike monitoring. When reinforcing dikes or installing sheet piles, it is critical that the pore pressure in the water-bearing layer stays within safe limits. The pressure is measured using a built-in diaphragm located in a cone.

Via two filters in the cone, the sensor contacts the soil and measures the groundwater pressure. To reduce temperature-related measurement variations, temperature sensors are included as well. The sensor is insensitive to air pressure fluctuations due to its unique sealed housing and glycerin-filled interior. This also helps prevent bacterial growth.

Two setup options

You can choose from two versions:

  • A telemetry solution with ElliTrack and cloud access
  • A standalone version with LevelStick, ideal for local data collection

The LevelStick is especially easy to install and remains in place even during backfilling.
Its design allows precise placement at the correct depth, thanks to a mechanical seal and minimal dead volume. It comes in both absolute and pressure-compensated versions.

LevelStick as pore pressure sensor

The LevelStick combines a diaphragm sensor with a stainless steel cone, and can be used in both pressure-compensated and absolute versions. The cable shielding and self-sealing fill compound ensure correct placement in the borehole. Sensors are available in 5 cm increments from 5 to 30 cm, allowing for flexible installation.

Specification Value
Logger LevelStick
Accuracy 0.05%
Units cm water column, hPa
Repeatability ≤ 0.02% FSQ
Cable material PUR, black
Housing material Stainless steel 1.4404 (316L)
Seal FKM
Diaphragm Stainless steel 1.4435 (316L)
Sensor sizes 5 – 10 – 15 – 20 – 30 cm
Weight ±100 g
Protection class IP68
Length 110 mm
Diameter (small–large) 24 – 49 mm
Log interval 1 to 86,400 seconds
Memory capacity 204,800 samples
A/D conversion 19 bits
Battery AA lithium cell 2400 mAh
Data communication BLETM

 

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