A strain gauge load cell is a type of force sensor that converts applied load into a proportional electrical signal, requiring conditioning for accurate output. It utilizes a Wheatstone bridge configuration, with active strain gauges that change resistance based on elongation or compression. These load cells come in various shapes such as shear beam and S-type, and consist of components including strain gauges, spring elements, and protective housing.

1. STRAIN GAUGE
LOAD CELL
All about Strain Gauge Load Cell
H T T P S : / / T A C U N A S Y S T E M S . C O M

2. WHAT IS A STRAIN GAUGE LOAD CELL
A strain gauge load cell is one type of load cell, out
of the various load cells that exists.
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3. TACUNASYSTEMS
It is a force sensor and also a transducer. It is a transducer that senses an
applied load (force weight) and then changes it into an electrical signal
output that is proportional to the load. The output electrical signal is
very small (in mV/V), hence it has to be conditioned to give an output
reading.
The conditioning may include amplification, attenuation, excitation,
filtering and isolation. For amplification, normal Operational amplifiers
are not efficient for the process, hence an instrumentation amplifier is
always conventionally used in commercial weighing systems.
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STRAIN GAUGE LOAD CELL

4. The strain gauge load cell is made out of
strain gauges that are electrically
connected in a Wheatstone bridge. The
Wheatstone bridge can be of different
configurations which are; one strain gauge
(Quarter Bridge), two strain gauges (half
bridge) and four strain gauges (full bridge).
Generally, the number of active elements
legs in the Wheatstone bridge determines
the kind of bridge configuration.

5. TACUNASYSTEMS
The strain gauge which is the sensitive element in load cells, is a bonded
resistive foil sensor which is capable of stretching and contracting, its
resistance varies with applied load. The material deforms/stretches and
contract, they are bonded onto a beam or a structural member using
adhesives. The strain gauges are mounted in areas that exhibit strain in
compression or tension. Most strain gauges are made from a copper-nickel
(constantan) alloys, the alloy metal is cut into zigzag foils to form the strain
gauge.
Other basic elements that make up a strain gauge load cell includes the
spring element, the sealing elements and the housing that helps to protect
the load cell components.
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6. TACUNASYSTEMS
There are several shapes of strain gauge load cells:
Shear beam
Double-ended shear beam
Compression load cell
S-type load cell
Rope clamp
Load pin
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TYPES OF STRAIN GAUGE
LOAD CELLS

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