Loading... Please wait...

Fiber Optic Strain Gauges

Rebar Strainmeters (Fiber Optic) | Model FP4911

  • Model FP4911 Fiber Optic Rebar Strainmeter.
Model FP4911

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.


Standard Range
−1000 to +1000 µε
0.15 µε
±0.25% F.S.
<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.

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.