ALF202 Donut Ring Force Sensor

Very high structural load limit

About the ALF202 Donut Ring Force Sensor

The ALF202 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. A load button and base plate are available for the ALF202.

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

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

Features ALF202

  • Full load range: 10kN, 25kN, 50kN, 100kN, 200kN
  • Dimensions (mm): OD83 x ID45 x H66
  • Non-lin./hysteresis: 0.1/0.1% RL
  • Hardened stainless steel body
  • Sealed to IP65
  • Very high structural load limit

All standard ranges are manufactured in stainless steel.

The loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 16-2-4C.

  • Excitation + = Red Signal + = Yellow Screen = Orange
  • Excitation - = Blue Signal - = Green

The screen is not connected to the loadcell body.


Measurement range
10kN, 25kN, 50kN, 100kN, 200kN
Non-linearity - Terminal
±0.1% RL
±0.1% RL
Creep - 20 minutes
±0.05% AL
±0.02% RL
Rated output - Nominal
Rated output - Rationalised
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)
1.6 to 1.8kg
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