FL 100

Brand : G.U.N.T

Category :Automation

Strain gauges are used extensively in sensor systems to detect forces, moments and deformations.

The FL 100 experimental unit provides a wide-ranging introduction to the fundamentals of measurement by strain gauges. Three test specimens for tension, bending and torsion are each fitted with four strain gauge measuring points. The strain gauges are wired in the full bridge. The specimens are loaded incrementally allowing for the strain reading to be sequentially monitored.

The specimens can be inserted quickly and precisely into the frame. The strain gauge measuring range is protected by a Plexiglas cover, which also makes it clearly visible for inspection purposes. The measuring amplifier supplies the bridge supply voltage, and displays the load-dependent “bridge detuning” digitally in voltage values. 

Learning objectives/experiments
  • fundamentals of measuring with strain gauges
  • strain gauge types and application techniques
  • calculation of the mechanical deformations under tension, bending and torsion
  • correlation between mechanical strain and electrical resistance in a strain gauge
  • with FL 100.01, FL 100.02, FL 100.03: determination of the modulus of elasticity for various materials from the measuring data of a tensile test
Scope of delivery

1 frame
3 strain gauge test specimens
2 sets of weights
2 hexagon socket wrenches
1 measuring amplifier with strain gauge connecting cable
1 storage system with foam inlay
1 set of instructional material

Features
  • basic introduction to measurement with strain gauges
  • test bars for tension, bending and torsion with strain gauge measuring points as full bridge
  • universal 1-channel measuring amplifier

Specification
  1. experimental unit investigating the fundamentals of strain gauge measurement
  2. tension, bending and torsion tests each with strain gauge measuring points in full bridge circuit
  3. strain gauge application areas protected by Plexiglas cover
  4. steel test bodies
  5. measuring amplifier with 4-digit digital display
  6. frame to house the measuring objects
  7. determination of modulus of elasticity on various materials using measuring objects FL 100.01, FL 100.02, FL 100.03
  8. storage system to house the components
Technical data

Tension bar

  • measuring length: 50mm
  • cross-section: 2x10mm2
  • modulus of elasticity: 191000N/mm2
  • Poisson’s ratio: 0,305

 

Bending bar

  • length: 385mm
  • cross-section: 5x20mm2
  • modulus of elasticity: 210000N/mm2
  • section modulus: 74,26mm3

 

Torsion bar

  • length: 500mm, Ø=10mm
  • section modulus: 196,3mm3
  • shear modulus: 80000N/mm2

 

Weights

  • small: 10x 0,5N, 1x 1N (hanger)
  • large: 1x 5N, 2x 10N, 1x 20N, 1x 5N (hanger)

 

Strain gauge measuring point: full bridge, 350Ω

Amplifier

  • measuring range: ±24mV
  • resolution: 1µV
  • zero balancing adjustment range: ±1mV
  • supply voltage: 10VDC

 

Frame opening WxH: 480x450mm

 

230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
UL/CSA optional

Dimensions and weight

LxWxH: 560x410x610mm (frame)
LxWxH: 600x400x320mm (storage system)
Weight: approx. 20kg