I found a load cell and wonder if its working or damaged since the diagonal voltage is not zero with no load on it. The diagonal voltage is about two volts when I supply 5 volts. There are no stickers on the cell only a handwriting which says 200kg so I didn't have a datasheet.
My research: I read that the diagonal voltage changes usually about 2 to 10mV per supplied volt when changing the load from 0kg to full load depending on the cell. I didn't find any information about the voltage level itself only about the change.
My thoughts: However 2V seems too high because a differential OpAmp with a gain higher then 2 could be easily out of range. While a gain of 2 is too low since 10mV should be amplified with 100 or so to get proper reading on a voltage measurement device.
So the question is: What is the usual range of load cell diagonal voltages?