For an experiment I had to make a scale that weighs a soil sample of around 80 kilo’s on a long term. I used 4 x 50kg load cells (3 wired) and a HX711 amp. For this experiment it is important that the measurements are pretty exact. Preferably a deviation of max 20 grams. Yesterday I did a test for 8 hours straight and I got the results as shown in the attachment. In this test I loaded the load cells with 45 kilo’s and set that state to zero. In the graph you can see that it deviated to -630 grams. The setup was placed in a closed room. If I want to go on with my experiment I have to get the deviation out or at least an explanation so I can use that as an argument. I really hope that there is someone that could help me with this problem.
Ps. Pictures of the setup are also in the atachments.