Fig. 6 Example Of A Load Cell - Beckhoff EP3356-0022 Documentation

The supply voltage U is thereby fed to the strain gauge (= current carrying conductor). The incoming supply
V
voltage U is only measured with high impedance directly at the measuring bridge in exactly the same way
ref
as the bridge voltage U
D
are hence omitted.
Since these are very small voltage levels of the order of mV and µV, all conductors should be shielded. The
shield must be connected to pin 5 of the M12 connector.
EP3356-0022: No 6-conductor connection necessary
The connection of a strain gauge over 4-conductor with the EP3356-0022 is sufficient because due
to the shorter cable lengths no measurement errors occur.
Structure of a load cell with a strain gauge
One application of the strain gauge is the construction of load cells.
This involves gluing strain gauges (full bridges as a rule) to an elastic mechanical carrier, e.g. a double-
bending beam spring element, and additionally covered to protect against environmental influences.
The individual strain gauges are aligned for maximum output signals according to the load direction (2 strain
gauges in the elongation direction and 2 in the compression direction).
Fig. 6: Example of a load cell
The most important characteristic data of a load cell
Characteristic data
Please enquire tot he sensor manufacturer regarding the exact characteristic data!
Nominal load E
max
Maximum permissible load for normal operation, e.g. 10 kg
Nominal characteristic value mV/V
EP3356-0022
with two currentless return conductors in each case. The conductor-related errors
Version: 1.1.0
Product overview
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