Parallel connection of strain gauges

It is usual to distribute a load mechanically to several strain gauge load cells at the same time. Hence, for example, the 3-point bearing of a silo container on 3 load cells can be realized. Taking into account wind loads and loading dynamics, the total loading of the silo including the dead weight of the container can thus be measured.

The mechanically parallel connected load cells are usually also electrically connected in parallel.
As the four M12 sockets of the EP3356-0022 are connected internally, an external parallel circuit is not necessary: if several load cells are connected to the EP3356-0022, they are automatically connected in parallel. Up to four load cells can be connected.

The three load cells in the above example (silo container) can thus be connected to any three of the M12 sockets of the EP3356-0022.

Note:

• the load cells must be matched to each other and approved by the manufacturer for this mode of operation
• the impedance of the load cells must be large enough that the maximum output current of the reference voltage U_ref is not exceeded: 350 mA.