Error 203 is thrown because the weight of the inductor is not becoming steady.  This is likely due to a high vibration environment. The easiest way to tell how much vibration you have is to look at the tablet screen while it is in the tablet holder. If you are unable to see a clear reflection of yourself, you are dealing with vibration. Look into adding vibration isolation to your pump mounts. McMaster-Carr carries a nice selection and this link will take you to the ones we use. 

A setting that you can adjust in the Mixmate itself can be found by going to Data -> Mixmates -> Click middle of Mixmate to edit -> Proceed -> Assemblies -> Inductor -> Adjust Scale Reaction Speed -> Save to get back to Mixmates list