ALF251 Miniature Load Cell

Miniature loadbutton cell for force measurement in confined spaces

About the ALF251 Miniature Load Cell

The ALF251 is ideally suited to force measurements in confined spaces in both tension and compression for control of critical parameters in all kinds of industrial processes. Their versatility is such that they are also applied in a great number of important fields of scientific and engineering test work, mobile as well as workshop, static and dynamic.

We are happy to design variants of this loadcell to meet your specific requirements. Please consult our engineering department.

The 10kg range is manufactured in aluminium. All other standard ranges are manufactured in stainless steel.
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: Very small loadbutton cell for force measurement in confined spaces. Used in compression and/or tension on a wide range of OEM or end-user applications.

With bi-directional versions there is a small difference between the output signal for compression and tension. All standard bi-directional loadcells are calibrated in both modes and the output for each direction is stated on the test / calibration certificate.

Features ALF251

  • Miniature diaphragm loadcell
  • Measurement range: 10kg, 20kg, 40kg, 80kg, 160kg, 320kg
  • Tension, compression and bi-directional
  • Non-lin./hysteresis: 0.5/0.5% RL
  • Dimensions (mm): Ø20 x 13
  • Tension / compression / bi-directional calibration
  • Easy installation
  • Standard 2 year warranty
  • Sealed to IP65
  • Hardened stainless steel body

1. AL = Applied load. 3. Temperature coefficients apply over the compensated range.
2. RL = Rated load. 4. The load must be applied directly through the central loading axis.

The loadcell is fitted with 2 metres of PVC insulated 4 core screened cable type 7-1-4C.
Excitation + = Red Signal + = Yellow Screen = Orange
Excitation - = Blue Signal - = Green
Reverse the signal connections to obtain a positive signal in tension mode. The screen is not connected to the loadcell body.


Measurement range
10kg, 20kg, 40kg, 80kg, 160kg, 320kg
Non-linearity - Terminal
±0.5, % RL
±0.5, % RL
Creep - 20 minutes
±0.1, % AL
±0.1, % RL
Rated output - Nominal
1.6, mV/V
Rated output - Rationalised
1.0, mV/V
Load direction
Tension, compression, bi-directional
Rationalisation tolerance
±0.5, % RL
Zero load output
±4, % RL
Temperature effect on rated output per ºC
±0.005, % AL
Temperature effect on zero load output per ºC
±0.03, % RL
Temperature range - Compensated
-10 to +50, ºC
Temperature range - Safe
-10 to +80, ºC
Excitation voltage - Recommended
10, V
Excitation voltage - Maximum
10, V
Bridge resistance
350, O
Insulation resistance - Minimum at 50Vdc
500, MO
Overload - Safe
50% RL
Overload - Ultimate
100, % RL
Weight - Nominal (excluding cable)
8 to 11, g
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