ST3 VIBRATING WIRE CONCRETE SURFACE MOUNT STRAIN GAUGE
Range 3000 microstrain
Resolution 1 microstrain
Accuracy ±0.1% full scale
Temperature range -20 to 80°C
Active gauge length 141.4mm
Excitation method Pluck or sweep
Material Stainless Steel
Dimensions L 157mm x Ø 12.7mm
Thermistor type NTC 3k Ω, accuracy ±0.5°C
The Concrete Surface Mounted Strain Gauge is used for measuring strain in concrete structures including load bearing concrete beams and piles.
A high carbon steel wire is held in tension between a fixed point and a movable point within the sensor.
The physical changes measured by the sensor result in small changes to the position of the movable point which results in a change to the tension of the wire.
The wire may be excited by either plucking or sweeping via a coil adjacent to the wire. The resulting resonant frequency (which is
relative to the tension of the wire) is then recorded by the same coil. The reading can be displayed by instrument readout or recorded by data logging equipment.