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GEODATA GroupHans-Kudlich-Strasse 28, A-8700 LeobenPhone: +43 3842 26555 0 [email protected] | www.geodata.com
These strain gauges are intended for measuring strain on concrete surfaces and on structural steel members like arches, struts, reinforcement bars or sheet piles. The measurements are used to determine structural loads and stress.
The reliable VW-technology enables the sensor to be applied in projects where long-term stability, robustness and insensitivity to electromagnetic interference are required.
Since we are dealing with a frequency transmission, sensors may be read remotely, more than 500m away from their location, without any loss of information due to long cables.
> Easy to install> Long term stability> Integrated temperature measurement> Reliable vibrating wire technology> Temperature compensated when welded on steel > High multiplexing capacity
General description
Highlights
SURFACE MOUNT STRAIN GAUGE
Instruments, Software and Systems01
Protected surface strain gauges
Arc weldable strain gauge with mounting blocks
Surface strain gauge with grautable anchor parts
Page 1V20200723
© 2020 Geodata
GEODATA Surveying and Monitoring GroupHans-Kudlich-Strasse 28, A-8700 Leoben
Phone: +43 3842 26555 0 Mail: [email protected]
www.geodata.com
SURFACE MOUNT STRAIN GAUGE
Principle of operation
Specifications
Instruments, Software and Systems01
Application, strain monitoring on:
> Struts> Girders, beams, columns> Piles, pressure vessel, pipelines> Steel support> Segmental tunnel linings> Retaining- and diaphragm walls
The sensors are based on the vibration wire principle, where a prestressed wire is fixed between two end blocks. The mounting blocks are either welded on a steel surface or are fixed with rebar bolts, bonded in drill holes.
Changes in strain between the mounting blocks will compress or tension the wire. The strain state is measured by plucking the wire and determination of the resonant frequency of the stressed wire using an electromagnetic coil.
Since the resonant frequency is slightly dependent on temperature and to monitor the temperature of the embedment, which probably also effects the stress, a thermistor is integrated.
Housing Stainless steel
Measuring range 3.000 μεResolution (depending on DAQ) 1,0 - 5,0 μεAccuraccy ± 0,5% F.S.
Nonlinearity ±2,5 - 4% F.S.
Temperature range -20°C to + 80°C
Cable type 4-conductor, 2 twisted pairs
Cable, jacket 4,75 mm Ø, PVC
Active gauge length 152 mm
Electrical readout unit
Input signal vibrating wire
Operating temperature -20°C to +70°C
Input range for VW 1 - 39 kΩ
Resolution 0,05 Hz
Accuracy 0,1 Hz
Input range for NTC 1 - 39 kΩ
Accuracy for temperature measurement ± 1°C
Protection class IP 40
GEODATA Surveying and Monitoring GroupHans-Kudlich-Strasse 28, A-8700 LeobenPhone: +43-(0)3842-26555-0 | Fax: DD -5
Mail: [email protected] www.geodata.com
Arc weldable strain gauge
Strain gauge with groutable mounting blocks
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© 2020 Geodata
