Pressure & Load Cells

EARTH PRESSURE CELLS

Geozone Geoservices_Geotechnical Instrumentation_Earth pressure cellsEarth pressure cells are used to monitor the total pressure in earthfill dams and embankments or at the interface between the structure and the excavation wall. The earth pressure cells consist of two stainless steel plates, welded together around their periphery. The anular space between these plates is filled, under vacuum, with de-aired oil. The pressure pad is connected via a stainless steel tube to the transducer, forming a closed hydraulic system. The stress is then converted to an electrical signal and may be remotely read on a variety of portable readout units or dataloggers.

Technical Specifications
VIBRATING WIRE SENSOR

L143D (circular)
L143S (rectangular)
Full scales 350, 500, 700 kPa
1, 1.7, 2, 5, 7 MPa
Resolution 0.025% FS
Accuracy < 0.5% FS
Pressure pad size circular OD 230 mm
rectangular 100x200mm
Operating temp. range -20°C +80°C
Pad thickness circular 12 mm
rectangular 6 mm
Transducer size OD 27mm, 180mm long

ELECTRIC TRANSDUCER

L141D (circular)
L141S (rectangular)
Full scales 200, 500 kPa
1, 2, 5, 10 MPa
Resolution 0.01% FS
Accuracy < 0.3% FS
Output signal 4-20 mA current loop
Pressure pad size circular OD 230 mm
rectangular 100x200mm
Operating temp. range -10°C +55°C
Pad thickness circular 12 mm
rectangular 6 mm
Transducer size OD 27mm, 180mm long

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NATM STRESS CELLS

Geozone Geoservices_Geotechnical Instrumentation_NATM Stress cellsSisgeo flexible diaphragm NATM Stress Cells have been designed to optimize measurements of radial and tangential stresses in shotcrete and concrete tunnel lining. The stress cell consists of a pressure pad connected to the transducer by a hydraulic line. The internal cavity between the two steel plates of the pressure pad and the hydraulic line is filled at factory by oil. The oil is deaired as well as the pressure pad under high vacuum in order to obtain the minimum oil compressibility. The rigidity of the cells are assured by the transducer, which has a ceramic diaphragm with negligible volume displacement in comparison with the cell cavity.

Technical Specifications
RADIAL STRESS CELL
(Product code 0L112R05000)

Measuring range 0-5 MPa (50 Bar)
Resolution 0.01 MPa with C6002
Accuracy < 0.3% FS
Pressure pad size square 150x150mm
Pad thickness 5 mm
Transducer size OD 25mm, 130mm long

TANGENTIAL STRESS CELL
(Product code 0L112T20000)

Measuring range 0-20 MPa (200 Bar)
Resolution 0.01 MPa with C6002
Accuracy < 0.3% FS
Pressure pad size rectangular 100x200mm
Pad thickness 5 mm
Transducer size OD 25mm, 130mm long

C6002 DIGITAL INDICATOR
(Product code 0C6002MV000)

Digital display 3.5 LCD
Resolution 10 kPa (0.01 MPa)
Battery 9V DC alkaline disposal
Operating time 2 hours continuously
Environmental -5°C +50°C, dust-proof case
Size 130x75x40 mm

REPRESSURIZING DEVICE
(Product code 0L111PUMP00)
This device allows the operator to increase the hydraulic oil pressure inside the cavity of the cell for maintaining close contact between the pressure pad and the surrounding material or for expanding the cells after the concrete has cured.

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HYDRAULIC PRESSURE CELLS

Geozone Geoservices_Geotechnical instrumentation_Hydraulic pressure cellsHydraulic pressure cells are designed to measure stress in mass concrete or at the interface between the structure and the excavation wall. The pressure pad consists of two steel plates welded together around their periphery, spaced apart by a narrow cavity saturated (under vacuum) with de-aired oil. This guarantees maximum rigidity. A length of high-pressure rilsan tubing connects the cavity of the pressure pad to the pressure transducer. A re-pressurising device is available for expanding the cells after the concrete has cured. Readings are obtained with portable readout units or dataloggers.

Technical Specifications
PRESSURE PADS
0L111151500

Pad size 150X150 mm
Working pressure up to 5 MPa
Application radial stress in concrete
0L111102000
Pad size 100×200 mm
Working pressure up to 20 MPa
Application tangential stress in concrete
0L111204000
Pad size 200×400 mm
Working pressure up to 5 MPa
Application contact soil/rock-structure
0L111D05000
Pad size circular 500mm OD
Working pressure up to 1 MPa
Application contact soil/rock-structure
PK45H VW PRESSURE TRANSDUCERS
Full scales 350, 500, 700 kPa
1, 1.7, 2, 5, 7 MPa
Resolution 0.025% FS
Accuracy < 0.5% FS
Operating temp. range -20°C +80°C
Transducer size OD 27mm, 180mm long
P252A PRESSURE TRANSDUCERS
Full scales 200, 500 kPa
1, 2, 5, 10 MPa
Resolution 0.01% FS
Accuracy < 0.3% FS
Output signal 4-20 mA current loop
Operating temp. range -10°C +55°C
Transducer size OD 27mm, 180mm long

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HYDRAULIC ANCHOR LOAD CELLS

Geozone Geoservices_Geotechnical instrumentation_Hydraulic anchor load cellsHydraulic anchor load cells are used to monitor loads in tiebacks, rock bolts and cables. They consist of two ring-shaped stainless steel plates welded together around their periphery. The pressure pad between the plates is filled, under high vacuum, by de-aired oil. A Bourdon manometer connected to the cell body directly measures the load. The manometer is calibrated in the lab to allow direct readings in kN. Electrical models equipped with 4-20 mA output pressure transducer are also available for remote readings. A very stiff distribution plate is supplied, in order to ensure that the load is applied equally over the loading surface of the cell. A bearing plate may not be required if adequate provisions have been incorporated into the installation design.

Technical Specifications
HYDRAULIC LOAD CELLS WITH HORIZONTAL MANOMETER

0L2M07050H0 500 KN, ID 71mm, OD 164mm
0L2M09075H0 750 KN, ID 92mm, OD 204mm
0L2M11100H0 1000 KN, ID 110mm, OD 228mm
0L2M13100H0 1000 KN, ID 138mm, OD 245mm
0L2M16150H0 1500 KN, ID 165mm, OD 293mm
0L2M22250H0 2500 KN, ID 225mm, OD 380mm
Overload 120% with zeroshift <2% FS
Resolution < 0.2% FS
Accuracy ± 1% FS
Temperature error < 1.5% FS at 25°C temperature difference
Material AISI 304 stainless steel

HYDRAULIC LOAD CELLS WITH ELECTRICAL TRANSDUCER

0L2E0705000 500 KN, ID 71mm, OD 164mm
0L2E0907500 750 KN, ID 92mm, OD 204mm
0L2E1110000 1000 KN, ID 110mm, OD 228mm
0L2E1310000 1000 KN, ID 138mm, OD 245mm
0L2E1615000 1500 KN, ID 165mm, OD 293mm
Overload 120% with zeroshift <2% FS
Resolution from 0.03% FS to 0.09% FS
Accuracy ± 1% FS
Temperature error < 1.5% FS at 25°C temperature difference
Material AISI 304 stainless steel

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ELECTRICAL ANCHOR LOAD CELLS

Geozone Geoservices_Geotechnical instrumentation_Electrical anchor load cellsElectrical resistance anchor load cells consist of a ring-shaped stainless steel body which incorporate from 8 to 16 electrical resistance strain gauges in a full bridge configuration. Typical applications include performance testing of anchor systems in tunnelling or deep excavations. The cell design minimizes the sensitivity to the eccentric load. Anchor load cells are available in a variety of ranges and diameters. A very stiff distribution plate is supplied, in order to ensure that the load is applied equally over the anular loading surface of the cell. Readings are obtained with a C6003 hand held digital indicator, Galvani readout or Leonardo datalogger.

Technical Specifications

0L204V03000 300 KN, ID 40mm, OD 155mm
0L205V05000 500 KN, ID 50mm, OD 155mm
0L207V07500 750 KN, ID 71mm, OD 155mm
0L211V07500 750 KN, ID 110mm, OD 200mm
0L212V10000 1000 KN, ID 120mm, OD 220mm
0L216V12000 1200 KN, ID 165mm, OD 260mm
0L216V15000 1500 KN, ID 165mm, OD 260mm
0L219V18000 1800 KN, ID 190mm, OD 300mm
0L222V25000 2500 KN, ID 225mm, OD 340mm
Full scales from 300 KN to 2500 KN
Overload 150%
Sensitivity 0.001 mV
Accuracy < 0.5% FS
Thermal zero shift < 0.005% FS / °C
Signal output 1.5mV/V, 2 mV/V at FS
Power supply from 2V DC to 10V DC
Output bridge resistance 1400 ohm
Compens. temp. range -10°C +60°C
Operating temp. range -15°C +70°C
Material stainless steel

DISTRIBUTION PLATES

0L20040PD00 centre hole 40mm, OD 110mm
0L20050PD00 centre hole 50mm, OD 110mm
0L20071PD00 centre hole 71mm, OD 110mm
0L20110PD00 centre hole 110mm, OD 155mm
0L20120PD00 centre hole 125mm, OD 180mm
0L20165PD00 centre hole 165mm, OD 210mm
0L20190PD00 ID 165mm, OD 250mm
0L20225PD00 centre hole 231mm, OD 290mm
Accessories
0ECONO7MV00 MIL male connector with cap
0ELC420MA00 4-20 mA transmitter (2 wires)

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STEEL LINING LOAD CELLS

Geozone Geoservices_Geotechnical Instrumentation_Steel lining load cellsSteel lining load cells are specially designed to monitor steel lining stress and pile testing. The L2CE model consists of a stainless steel cylinder body with a pressure transducer. The pressure pad is held by two stiff stainless steel plates and is saturated, under vacuum, with de-aired oil. Special distribution plates with spherical surfaces are available to improve the quality of the measurements. Electrical Resistance Load Cells are designed to perform pile testing and to monitor load compression of struts, tiebacks and arch supports. The L2CT model consists of a solid cylinder body manufactured from high tensile, heat-treated steel with precision bearing surfaces. It incorporates from 4 to 8 electrical strain gauges, in full bridge configuration.

Technical Specifications
L2CE STEEL LINING LOAD CELLS

0L2CE019000 1900 KN, OD 191 mm
0L2CE030000 3000 KN, OD 245,5 mm
Accuracy (linearity, hysteresis and repeatibility) < 1% FS
Signal output 4-20 mA (current loop)
Temp. operating range from –20° to +80°C
Protection Class IP 68 up to 100 KPa
Material stainless steel

DISTRIBUTION PLATES
Sisgeo L2CE cells are specially designed for steel lining and pile testing applications.

0L2CE200PD0 Twin plates, overall diam. 200mm
0L2CE252PD0 Twin plates, overall diam. 252mm

L2CT SOLID LOAD CELLS

0L2CT030000 3000 KN, OD 135 mm
0L2CT050000 5000 KN, OD 180 mm
Overload 150%
Sensitivity 0.01% FS
Accuracy 0.2% FS
Thermal zero shift < 0.005% FS / °C
Signal output 2 mV/V at FS
Temp. operating range -40°C +75°C
Compensated temp. range -20°C +60°C
Protection Class IP 65
Material steel UR-40

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HYDRAULIC PRESSURE CELLSHydraulic pressure cells are designed to measure stress in mass concrete or at the interface between the structure and the

excavation wall. The pressure pad consists of two steel plates welded together around their periphery, spaced apart by a

narrow cavity saturated (under vacuum) with de-aired oil. This guarantees maximum rigidity. A length of high-pressure

rilsan tubing connects the cavity of the pressure pad to the pressure transducer. A re-pressurising device is available for

expanding the cells after the concrete has cured. Readings are obtained with portable readout units or dataloggers.

Technical Specifications
PRESSURE PADS
0L111151500
Pad size                 150X150 mm
Working pressure             up to 5 MPa
Application                 radial stress in concrete

0L111102000
Pad size                 100×200 mm
Working pressure             up to 20 MPa
Application                 tangential stress in concrete

0L111204000
Pad size                 200×400 mm
Working pressure             up to 5 MPa
Application                 contact soil/rock-structure

0L111D05000
Pad size                 circular 500mm OD
Working pressure             up to 1 MPa
Application                 contact soil/rock-structure

PK45H VW PRESSURE TRANSDUCERS
Full scales                 350, 500, 700 kPa, 1, 1.7, 2, 5, 7 MPa
Resolution                 0.025% FS
Accuracy                 < 0.5% FS
Operating temp. range             -20°C +80°C
Transducer size             OD 27mm, 180mm long

P252A PRESSURE TRANSDUCERS
Full scales                 200, 500 kPa, 1, 2, 5, 10 MPa
Resolution                 0.01% FS
Accuracy                 < 0.3% FS
Output signal                 4-20 mA current loop
Operating temp. range             -10°C +55°C
Transducer size             OD 27mm, 180mm long