EARTH PRESSURE CELLS
Earth 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
Sisgeo 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
Hydraulic 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
Hydraulic 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
Electrical 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
Steel 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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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