Total Earth Pressure Cells

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Total Earth Pressure Cells are designed to measure stress acting on plane surfaces.

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Overview

Total Earth Pressure Cells are designed to measure stress acting on plane surfaces. Total Earth Pressure Cells are constructed from two circular stainless steel plates, welded together around their periphery. The annular space between these plates is filled with deaired glycol. The cell is connected via a stainless steel tube to a transducer forming a closed hydraulic system. The stress is then converted to a signal and may be remotely read on a variety of portable readout units or data loggers.

RST Total Earth Pressure Cells are calibrated as a complete assembly (rather than just the sensor) to capture the calibration of the complete cell for highest quality of data.


TOTAL EARTH PRESSURE CELL SPECIFICATIONS

ITEM MODEL LPTPC-V MODEL LPTPC-S
Transducer Type Vibrating Wire Silicon Strain Gauge
Range – Standard Calibration Up to 2.0 MPa (300 psi) Up to 2.0 MPa (300 psi)
Range – Max Available 20 MPa (3000 psi) 20 MPa (3000 psi)
Calibrated Accuracy 0.15% F.S. 0.15% F.S.
Resolution 0.025% F.S. minimum Infinite
Excitation Voltage 5 V sq. Wave Dependent on sensor
Signal Output 1200 – 2000 Hz 4-20 mA
Thermistor Yes (standard) Optional (can be added)
Conductor 4 X #22 (2 for VW, 2 for Thermistor) 4 X #22 | 2 X #22
Operating Temperature -29° to +65°C  -20° to +150°F -29° to +65°C  -20° to +150°F

*Various types of strain gauge transducers are available, contact RST for info.

Total Earth Pressure Cells are commonly used for:

  • Earth embankments and dams.
  • Foundations, retaining walls, and piles.
  • Pipelines and culverts.
  • Railroad bases.
  • Beneath raft foundations.
  • Tunnel linings.
  • Mine backfill monitoring.

View illustrations on how Total Earth Pressure Cells are used for:

Total Earth Pressure Cells Ordering Info

TRANSDUCER STANDARD CELL DIA. STANDARD PRESSURES (0.35 MPA – 3 MPa) HIGH PRESSURES (>3 MPa – 20 MPa) LOW PRESSURES (<0.35 MPa)
Vibrating Wire Axial 16.2 cm (6.38 in.) LPTPC06-V-M LPTPC06-V-M-HP  –
Vibrating Wire 24.1 cm (9.5 in.) LPTPC09-V LPTPC09-V-HP LPTPC09-V-LP
Vibrating Wire 31.7 cm (12.5 in.) LPTPC12-V LPTPC12-V-HP LPTPC12-V-LP
Silicon Strain Gauge 24.1 cm (9.5 in.) LPTPC09-S LPTPC09-S-HP LPTPC09-S
Silicon Strain Gauge 31.7 cm (12.5 in.) LPTPC12-S LPTPC12-S-HP LPTPC12-S

 

Optional

ITEM PART #
Vibrating Wire Cable EL380004
Mounting Ears (4 tabs) LPTPC

 

Other Ordering Info

Part number.
Pressure range requirements.
Cable length.

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
 
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd