ALF313 Low-profile Donut Ring Force Sensor

The ALF313 is ideally suited to engineering force measurements

About the ALF313 Low-profile Donut Ring Force Sensor

The ALF313 is ideally suited to engineering force measurements. 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 fully compensated operation up to +250°C. Please consult our engineering department.

When this loadcell is rationalised the resistors are housed in a capsule located in the loadcell cable 100mm from the free end. Capsule dimensions are Ø10mm by 57mm.

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 on a wide range of OEM or end-user applications.

Features ALF313

  • Full load range: 10kN, 20kN, 40kN, 80kN, 100kN, 120kN, 160kN, 200kN
  • Load direction: compression
  • Non-lin./hysteresis: 0.5/0.5% RL
  • Low profile with centre hole
  • Ranges to suit bolt sizes from M6 to M36
  • Stainless steel construction

For ranges up to 4 tonnes the loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 7-1-4C. Ranges above 4 tonnes are fitted with 7-2-4C cable.

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

The screen is not connected to the loadcell body.


Parameter 10kN 20 to 200kN Unit
Non-linearity - Terminal ±0.5 ±0.5 % RL
Hysteresis ±0.5 ±0.5 % RL
Creep - 20 minutes ±0.1 ±0.1 % AL
Repeatability (excluding rotational effects) ±0.1 ±0.1 % RL
Rated output - Nominal 1.3 1.3 mV/V
Rated output - Rationalised 1.0 1.0 mV/V
Rationalisation tolerance ±0.5 ±0.5 % RL
Zero load output ±4 ±4 % RL
Temperature effect on rated output per °C ±0.005 ±0.005 % AL
Temperature effect on zero load output per °C ±0.03 ±0.03 % RL
Temperature range - Compensated -10 to +50 -10 to +50 °C
Temperature range - Safe -10 to +80 -10 to +80 °C
Excitation voltage - Recommended 10 10 V
Excitation voltage - Maximum 10 20 V
Bridge resistance 350 700 Ω
Insulation resistance - Minimum at 50Vdc 500 500
Overload - Safe 50 50 % RL
Overload - Ultimate 400 400 % RL
Sealing IP65 IP65  
Weight - Nominal (excluding cable) 15 20-260 g
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