Total Earth Pressure Cell
Total Earth Pressure Cells are designed to measure stress acting on plane surfaces.
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.
|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:
View illustrations on how Total Earth Pressure Cells are used for:
|TRANSDUCER||STANDARD CELL DIA.||STANDARD PRESSURES (0.35 MPA – 3 MPa)||HIGH PRESSURES (>3 MPa – 20 MPa)||LOW PRESSURES (<0.35 MPa)|
|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|
|Vibrating Wire Cable||EL380004|
|Mounting Ears (4 tabs)||LPTPC|
|Pressure range requirements.|
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