ALF203 Donut Ring Force Sensor

For use in compression or in fail-safe tensile applications

About the ALF203 Donut Ring Force Sensor

The ALF203 is ideally suited to engineering force measurements including through centre safety testing of cables, rods and bolts. It is designed for easy installation, usually between two flat faces bearing on its loading rings, either unattached or with retaining spigots positioned in the centre hole. Alternatively tensile load transfer can be achieved via a tie rod assembly through the centre hole. In this way the loadcell can indirectly measure tensile loads in a "fail-safe" mode.

We are happy to design variants of this loadcell to meet your specific requirements. Versions can be manufactured for operation up to +250°C. Please consult our engineering department.

Geometry: Axial strain cylinder in a sealed case, with raised end load bearing faces and hole right through. For use in compression or in fail-safe tensile applications.

Features ALF203

  • Hardened stainless steel body
  • Sealed to IP65
  • Standard 2 year warranty
  • Tensile applications are ‘fail-safe’
  • Very high structural load limit
  • Traceable calibration with certificate included in the standard price

All standard ranges are manufactured in stainless steel.


Measurement range
400kN, 800kN
Non-linearity - Terminal
±0.25% RL
±0.25% RL
Creep - 20 minutes
±0.05% AL
±0.02% RL
Rated output - Nominal
Rated output - Rationalised
1.0 mV/V
Load direction
Rationalisation tolerance
±0.5% RL
Zero load output
±4% RL
Temperature effect on rated output per °C
±0.005% AL
Temperature effect on zero load output per °C
±0.03% RL
Temperature range - Compensated
-10 to +50°C
Temperature range - Safe
-10 to +80°C
Excitation voltage - Recommended
Excitation voltage - Maximum
Bridge resistance
700 Ω
Insulation resistance - Minimum at 50Vdc
500 MΩ
Overload - Safe
50% RL
Overload - Ultimate
400% RL
Weight - Nominal (excluding cable)
5 to 5.5kg
  • Follow us: