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The Model FP4911 Fiber Optic Rebar Strainmeter is designed for measuring strains in foundations, slurry walls, precast piles, caissons, bridge abutments, tunnel liners, etc. The standard Model FP4911 (#4 rebar), known as the “Sister Bar,” is installed alongside structural rebar. The Fibre Optic element employed in this sensor makes it particularly suitable where dynamic measurements are to be made and/or on projects where other fiber optic sensors are deployed.

Specifications

Standard Range
−1000 to +1000 µε
Resolution
0.15 µε
Accuracy
±0.25% F.S.
Nonlinearity
<0.5% F.S.
Temperature Sensitivity
0.85 to 1.22 µε/°C
Temp. Operating Range¹
−40 °C to +80 °C
Rebar Size
4 (Sister Bar)
Active Gauge Length
914 mm

¹Other ranges available on request.