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Fiber Optic Rebar Strainmeter

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• 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 Gage Length: 914 mm

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.