The 150mm long gauge, which is made from stainless steel, may be pre-attached to rebar or by attachment to a 2, 3 or 4 directional rosette, thereby measuring strain in several directions.
The gauge comprises a sealed tube containing a wire held in tension between two circular stainless steel pads, one at each end.
Deformation to these pads alters the tension of the wire and the resulting readings are used to measure strain. The changes in strain are monitored by the coil assembly mounted on the gauge. The gauges can also read temperature if required.
Product Features:
• Located within concrete
• Uses proven Vibrating Wire technology
• Suitable for manual or remote monitoring
• Fully waterproof
• Fitted with thermistor for temperature monitoring
The gauge is installed prior to concrete pour and protected during the pour to prevent damage. The gauge may also be pre-cast into a concrete briquette for subsequent casting into the structure, or embedded into holes drilled into an existing structure.
The pickup coil is fitted over a flattened section in the centre of the gauge tube and held in place using a securing clamp; this can be installed on site immediately prior to installation. The sensor is then installed by placing the gauge at a location in the structure suitable for accurately passing micro-deformation from the surrounding cured concrete to the gauge.
Cables from the gauges are run to a readout, a terminal box, or a data logging point. The gauges can be read individually or remotely/automatically as part of a data collection system. Any commercially available Vibrating Wire readout (or a data logger) and the incorporated thermistor allows for temperature data to be recorded.
Ordering Information:
Vibrating Wire Embedment Strain Gauge
3000μ strain range. Includes sensor with thermistor
ST4-1.1 Set for mid-range. Sensor with specified cable length CA-3.1-4-IC fitted
ST4-1.3 Set for mid-range. Sensor with 3m cable length
ST4-1.4 Set for mid-range. Sensor with 10m cable length
ST4-1.5 Set for mid-range. Sensor with 25m cable length
ST4-1.2 Set for compression. Sensor with specified cable length CA-3.1-4-IC fitted
ST4-1.6 Set for compression. Sensor with 3m cable length
ST4-1.7 Set for compression. Sensor with 10m cable length
ST4-1.8 Set for compression. Sensor with 25m cable length
Connecting Cable and Fittings
CA-3.1-4-IC Instrument cable 4 core, 7/0.20; screened, priced per metre
CA-4.1 Joint sealing kit
CA-4.2 Coloured adhesive tapes; pack of 10
CA-4.3 Crimping tool
CA-4.4 Crimping sleeves; pack of 100
W6-6.1 Nylon ties; 150mm x 3.5mm, pack of 100
ST1-3.5 Nylon ties; 370mm x 4.7mm, pack of 100
Manual
MAN-142 Vibrating Wire Embedment Strain Gauge
st4-vibrating-wire-embedment-strain-gauge-ds1012-rev3