DIGITAL TAPE EXTENSOMETER
Tape extensometer is used to take accurate distance measurements between pairs of target points that have been permanently installed. The instrument is a removable stainless steel measuring tape with equally-spaced punched holes incorporated in an aluminium and stainless steel body with external pneumatic tensioning device and incorporated dial gauge. At the same time, the tape extensometer provides constant tension on the tape and accurate readings on the dial gauge. A portable compressor provides compression air to adjust the tape tension during measurements. Typical applications include convergence monitoring of tunnel linings, according to NATM practice, and of shafts, underground openings and caverns.
Technical Specifications
| 0DNP0150000 | 15 M TAPE |
| 0DNP0300000 | 30 M TAPE |
| 0DNP0CF1100 | CALIBRATION FRAME |
| Digital gauge | 5 digits LCD, 6mm height |
| Gauge range | 100 mm |
| Gauge resolution | 0.01 mm |
| Repeatabilty | ± 0.1 mm |
| Tape width | 13 mm |
| Tape scale division | centimetre punched every 25mm |
| Body diameter | 60 mm |
| Overall length | 870 mm |
REFERENCE BOLTS
A wide range of measuring bolts are available that can be grouted, welded or anchored to the structure.
| 0DN0CH20000 | 200mm groutable 3/8” stud bolt |
| 0DN0CH50000 | 500mm groutable 3/8” stud bolt |
| 0DN0CHE1000 | 1000mm groutable 3/8” stud bolt |
| 0DN0CH05000 | weldable 3/8” stud bolt |
| 0DN0CH20E00 | 200mm groutable eyebolt |
| 0DN0CH05E00 | weldable eyebolt |
| 0DN0TS10E00 | wall eyebolt |
REMOVABLE TARGETS
(Product code 0GCTR005000)
Reflective targets allow automatic convergence monitoring by topographic total station. Designed to fit the 3/8” stud convergence bolts by its own adaptor.
| 0GCTR38ADS0 | 3/8”G stainless steel stud adaptor |
| 0GCTR38ADP0 | 3/8”G plastic stud adaptor |
__________________________________________________________________________________________
MECHANICAL JOINTMETERS
A wide range of mechanical crackmeters (jointmeters) are produced in order to provide for all client requirements. The removable extensometer allows the measurement of relative movements between two reference pins positioned across the joint (fissure). The extensometer, which comes with its own portable, storage case, has a precise sliding rail with adjustable base length. Uniaxial and 3-D (triaxial) mechanical jointmeters are also available to monitor joints and cracks. The movements between the two anchors are obtained with mechanical dial gauges. Simple and inexpensive, the TT-1 tell-tale crack monitor installed across a fissure allows the crack survey to be conducted in two directions.
REMOVABLE EXTENSOMETER
(Product code 0DF250C5000)
| Measuring range | 50mm |
| Base length | adjustable at 200, 300 or 500mm |
| Resolution | 0.01 mm |
| Repeatability | better than ±0.02mm |
| Accessories | |
| 0DF25PIN200 | UNIAXIAL CRACKMETER |
| 0DF20TKIT00 | 3-D CRACKMETER ASSEMBLY |
| MECHANICAL JOINTMETERS | |
| 0D3101D3000 | UNIAXIAL CRACKMETER |
| 0D3103D3000 | 3-D CRACKMETER ASSEMBLY |
| Mechanical range | 0-30mm (±15) in all directions |
| Base lengths | 500 mm (uniaxial) or 200 mm (3-D triaxial) |
| DIAL GAUGE KIT | |
| (Product code 0DIG30KIT00) | |
| Measuring range | 0-30mm (±15) in all directions |
| Resolution | 0.01 mm |
| Accuracy | 0.05 mm |
| TELL-TALE CRACK MONITOR | |
| (Product code 0D300LINE00) | |
| TT-1 type | 2-D biaxial |
| Mechanical range | ±25 mm in both directions |
| Resolution | 0.01 mm |
| Accuracy | 0.05 mm |
__________________________________________________________________________________________
DBS MEASURING ANCHORS
Measuring anchors are a combination of rock bolt and extensometer. They are used to evaluate the performance of rock anchors in all types of applications. Measuring anchor consists of a hollow anchor body with inside installed a 4-point mini extensometer with anchor points at 4 different levels. Sisgeo measuring anchor is available for nominal load of 250KN with lengths of 4,6 or 9 meters. Readings are taken manually by a dial gauge or could be also automated by using vibrating wire displacement transducers.
Technical Specifications
| 0DBS2503244 | DBS 4M LONG |
| 0DBS2503264 | DBS 6M LONG |
| 0DBS2503294 | DBS 9M LONG |
| Loading capacity | 250 KN |
| Anchoring points | 4 |
| Overall outer diameter | 38 mm |
| Drilling diameter | 50 mm |
| Materials: | |
| - Rods | iron |
| - Central anulus | brass |
| - Head | Stainless steel |
| MANUAL MEASURING EQUIPMENT | |
| (Product code 0DIG10KDBS0) | |
| Range | 0 – 10 mm |
| Resolution | 0.01 mm |
| 4-FOLD VIBRATING WIRE MEASURING HEAD |
|
| (Product code 0DBS04DTE00) | |
| Displacement transducer | 4 nos. vibrating wire |
| Range | +/- 5mm |
| Resolution | 0.01 mm |
| Accuracy | < 0.5% FS |
| Operating temperature | -20°C +80°C |
| Signal output | frequency |
| Dimension Length | 270mm, OD 54mm |
__________________________________________________________________________________________
BOREHOLE ROD EXTENSOMETERS
Rod extensometers are installed in boreholes in order to monitor displacements at various depths using rods of different materials and lengths. A pre-set length of measuring rod is inserted into a nylon tube to avoid soil friction and its tip is fixed to a steel groutable anchor. Preassembled fibre glass rods are coiled when manufactured and shipped ready for installation. Stainless steel and invar rods are supplied in bars of 2 metre lengths and need to be mounted on-site. The complete rod extensometer assembly is grouted through a dedicated tube, but at the same time, allowing free movement of each rod within its sleeve.
Technical Specifications
| 0D222AC00A0 | s/steel or invar rods, DTE < 100 mm |
| 0D222AC00B0 | s/steel or invar rods, DTE > 100 mm |
| 0D222FG00A0 | fibre glass rods, DTE < 100 mm |
| 0D222FG00B0 | fibre glass rods, DTE > 100 mm |
| Number of bases | 1 (single), from 2 to 7 (multiple) |
| Multiple head top tube | OD 120 mm |
| Extensometer rods | FG fibre glass continuous |
| AC stainless steel, 2 m sections | |
| IN invar, 2 m sections | |
| Protective sleeve | nylon 11 (rilsan), OD 12 mm |
| Groutable anchor | FG: rebar 16mm OD, 400 mm long |
| AC/IN: rebar 22m OD, 400 mm long | |
| System Components | |
| 0D221BMFG00 | FIBRE GLASS ROD, 0D 7mm |
| 0D221BMAC00 | STAINLESS STEEL ROD, OD 8mm |
| 0D221BMIN00 | INVAR ROD, OD 8 mm |
| 0D222TOP200 | PROTECTIVE CAP, DTE: 10, 25, 50mm |
| 0D222TOP320 | PROTECTIVE CAP, DTE: 100,150,200mm |
| 0D222KTOP01 | SINGLE BASE CAP KIT |
| 0D222K7AC00 | INSTALLATION KIT FOR AC/IN RODS |
| 0D222K6FG00 | INSTALLATION KIT FOR FG RODS |
| DIGITAL GAUGE | |
| (Product code 0DIGD020000) | |
| Measuring range | from 0 to 200mm |
| Resolution | 0.01 mm |
__________________________________________________________________________________________
DISPLACEMENT TRANSDUCERS
Borehole rod extensometers could be simply read with mechanical depth gauge. The mechanical system is easily converted to provide an electrical output for remote monitoring and data acquisition. An electrical or vibrating wire linear displacement transducer is fitted to each extensometer rod on the instrument head. The range of the displacement transducer is selected to match the rod displacement. The transducer can be adjusted on the extensometer head to trim the zero position. An electric cable connects the displacement transducers to the measuring box for manual readings with portable readout, or to the ADK-100 automatic data acquisition system.
Technical Specifications
DTE DISPLACEMENT TRANSDUCERS
DTE transducers are available either with linear potentiometer or vibrating wire transducer.
| Linear Potentiometers | |
| Measuring range | 25, 50, 100, 150, 200mm |
| Resolution | 0.01 mm (depending of readout) |
| Accuracy | <0.3% FS |
| Signal output | 4-20 mA (current loop) |
| Power supply | 12-24V DC |
| Operating temperature | -20°C +60°C |
| Overall diameter | 16 mm |
| Environmental | IP68 (watertight up to 200 kPa) |
| Vibrating Wire Transducers | |
| Measuring range | 25, 50, 100, 150 mm |
| Resolution | 0.01 mm (depending of readout) |
| Accuracy | < 0.5% FS |
| Signal output | frequency |
| Operating temperature | -20°C +80°C |
| Overall diameter | 16 mm |
| Environmental | IP68 (watertight up to 200 kPa) |
__________________________________________________________________________________________
EMBANKMENT EXTENSOMETERS
Embankment (soil) extensometers are used to measure soil strains in large earth structures. During the construction stage, the embankment extensometers are usually incorporated in the filling material. The system consists of a number of anchor plates connected by extension rods to the measuring elements. The measuring element is a telescopic tube equipped with a vibrating wire displacement transducer to monitor the change in distance between two anchor plates. A number of elements may be chained together by means of 1, 2 or 3 m extension rods. Vibrating wire displacement transducers are available in different ranges for measuring up to 150 mm of displacement.
Technical Specifications
| System Components | |
| 0D2320BM100 | EXTENSION ROD, 1 M |
| 0D2320BM200 | EXTENSION ROD, 2 M |
| 0D2320BM300 | EXTENSION ROD, 3 M |
| 0D111PV5500 | PVC CORRUGATE ANTIFRICTION SLEEVE |
| 0D232AN5000 | ANCHOR PLATE, DIAM 500 MM |
| 0D232AN5500 | ANCHOR PLATE, 500×500 MM |
| MEASURING ELEMENTS | |
| 0D232T050VW | 50 mm (±25) range |
| 0D232T100VW | 100 mm (±50) range |
| 0D232T150VW | 150 mm (±75) range |
| Type of sensor | vibrating wire with built-in thermistor |
| Measuring range | 50, 100, 150mm |
| Resolution | 0.01 mm (depending of readout) |
| Accuracy | <0.5% FS |
| Signal output | frequency |
| Operating temperature | -20°C +80°C |
| Material | stainless steel |
__________________________________________________________________________________________
CRACKMETERS AND JOINTMETERS
Crackmeters and jointmeters are used to monitor movements across surface cracks and joints in concrete structures or rock. The instrument assembly includes a sensor housing and a target. Both parts are equipped with screw anchors. Typically, the anchors are bolted on the opposite sides of the joint (crack). The displacement transducer housed in the sensor body is positioned across the joint/crack which enables measurement of the changes in the distance between the anchors. CRID is an integrated system for fissure monitoring of building and monuments, which reduces the visual impact. CRID includes four miniature fissure meters (sensors) connected by signal cable to a compact, battery-powered datalogger for automatic data acquisition.
Technical Specifications
| Linear potentiometer transducers | |
| Full scales | 10, 25, 50, 100, 150mm |
| Resolution | 0.01 mm (dependent of readout) |
| Total accuracy | ± 0.3% FS including linearity and hysteresis |
| Signal output | 4-20 mA (current loop) |
| Power supply | 12-24V DC |
| Operating temperature | -20°C +60°C |
| Sensor diameter | 16 mm |
| Anchor distance | 500 mm |
| Environmental | IP68 (watertight up to 200 kPa) |
| Material | stainless steel |
| Vibrating wire transducers | |
| Full scales | 10, 25, 50, 100, 150mm |
| Resolution | 0.01 mm (dependent of readout) |
| Total accuracy | <0.5% FS including linearity and hysteresis |
| Signal output | frequency |
| Operating temperature | -20°C +80°C |
| Sensor diameter | 16 mm |
| Anchor distance | max 500 mm |
| Environmental | IP68 (watertight up to 200 kPa) |
| Material | stainless steel |
| Accessories for 2-D and 3-D monitoring | |
| 0D31Y1DTE00 | Y-AXIS FIXING PLATE |
| 0D31Z1DTE00 | Z-AXIS PAIR OF FIXING PLATE |
__________________________________________________________________________________________
WIRE CRACKMETER AND DEFORMETER
Wire crackmeter is used to monitor the changes in the distance between two anchor points located up to 30 m apart. Typical applications include measurements of large displacements associated with landslides, monitoring of rock-masses, masonry cracks and surveying of earth faults. The wire crackmeter consists of a stainless steel transducer box and target assembly made by an eyebolt expansion anchor. The electrical deformeter is used to monitor the displacement between two opposite surfaces and convergence in underground openings and tunnels. The displacement transducer is housed in a stainless steel body mounted on a fixing plate for wall/floor installation. A Kevlar rope forms the connection between the transducer and the target.
Technical Specifications
| WIRE CRACKMETER | |
| (Product code 0D241A20000) | |
| Mechanical range | 2000 mm |
| Sensitivity | 0.03 mm |
| Accuracy | ±1 mm (depends mainly from the thermal effects on the wire) |
| Repeatability | ±0.03 mm |
| Signal output | 4-20 mA (current loop) |
| Operating temperature | -20°C +60°C |
| Wire diameter | 2 mm, stainless steel |
| Max. wire tension | 8 Kg |
| Base (wire) length | up to 30 meter distance between transducer and target |
| Transducer housing | 300x200x185 mm |
| Target assembly | eyebolt expansion anchor |
| WIRE DEFORMETER | |
| (Product code 0D313F00000) | |
| Type of sensor | linear potentiometer or vibrating wire |
| Signal output | 4-20 mA, frequency |
| Measuring range | 25 mm (±12.5), 50 mm (±25) |
| Resolution | 0.01 mm (depending on readout) |
| Total accuracy | <0.3%FS (4-20mA) |
| <0.5%FS (vibrating wire) | |
| Operating temperature | -20°C +60°C |
| Wire | Kevlar rope |
| Base (wire) length | up to 10 meter |
| Sensor housing | 16mm diam. |
__________________________________________________________________________________________
FIXED EXTENSOMETERS
Fixed extensometer is a device placed in embankment fill or inside a borehole for monitoring settlement or heave between two points, without using a removable probe. The settlement platform or the tell- tale extensometer can be used, based on a string of settlement rods. These are, respectively, connected to a plate buried at the embankment foundation level or to a datum point grouted inside the borehole in firm soil. Optical levelling at the top of the riser rod provides precise monitoring. Electrical transducers can be used for automatic remote readings even in inaccessible locations.
Technical Specifications
SETTLEMENT PLATFORM
The primary advantage of the settlement platform is its simplicity. The settlement platform consists of a galvanized square plate to which a riser settlement rod is attached. Anti-friction corrugate pipe is placed around the riser rod. Optical levelling measurements to the survey point mounted on the top cap provides a record of plate elevation.
| 0D100A20000 | 2M SECTION RISER ROD |
| 0D111PV5500 | CORRUGATE PIPE, OD 55mm |
| 0D100B05000 | SQUARE PLATE 500x500mm |
| 0D100T15000 | TOP CAP AND SURVEY POINT |
TELL-TALE EXTENSOMETER
The tell-tale extensometer is a single-point extensometer which is, typically, used for precise monitoring of ground surface settlement or heave. It consists of a stainless steel bottom anchor to which a string of riser measuring rods is attached. Anti-friction corrugate pipe is placed around the riser rods. Optical levelling measurements of the top head of the riser rod provides a record of ground settlement. Sliding rings are located at both ends in order to prevent down drag forces on the rod.
| 0D100A20000 | 2M SECTION RISER ROD |
| 0D111PV5500 | CORRUGATE PIPE, OD 55mm |
| 0D100TT6000 | BOTTOM ANCHOR |
| 0D100TT0100 | TOP CAP AND SURVEY POINT |
| 0D100TTEL10 | DTM MEASURING HEAD |
DTM ELECTRICAL TRANSDUCERS
(Product code 0DTM0000000)
DTM electrical transducers can be mounted on either settlement platforms or the tell-tale extensometers.
| Range | 250mm, 500mm, 1000mm |
| Total accuracy | 0.25% F.S. |
| Output signal | 4-20 mA |
__________________________________________________________________________________________