What difference is there between a 4-wire and a 6-wire load cell? What needs to be taken into account when installing them?

The 6-wire load cells have two extra wires called “reference” (Sense + and Sense –) that are used to measure and adjust the actual voltage reaching the load cells.

Thanks to the references, the 6-wire load cells can compensate for a voltage drop, e.g. due to temperature changes or cable length, without affecting weight measurement.
For this reason, if necessary, their cable can be shortened without damaging the load cell, while bearing in mind that making a modification to the original product involves the loss of the warranty.

The 4-wire load cells, on the other hand, are calibrated and thermally compensated in relation to the length of the cable with which they are supplied as standard.

That is why we recommend that you never shorten the cable: this could compromise the reliability of the calibration and compensation.
If possible, it should be inserted into the cable duct by itself and laid as far away as possible from the power cables.
In addition, in order to limit a voltage drop in the portion of the cable between the junction box and the weight indicator, it is recommended to use a shielded cable with a significant cross-section (at least 1 mm2).