Cerbo GX MK2 - Voltage Tank Sensor instability

DIY
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1

I have installed a Cerbo GX MK2 in a caravan, it works great. But we are having instability with the tank monitoring.
We are using 2 x GX TANK 140 modules to monitor FIVE tanks, we are using the ENERDRIVE voltage sensors 0-500mm depth. These are a 9-32v input and a 0-5v output.

Tanks are roughly 85L, all 5 tanks are the same.
We have filled tanks to the top, set the top voltage of 3.2V and emptied to set the bottom voltage to 1.0V.
Now if the tanks holding water it is ok, but if the tank is nearly empty, it will range in amount of water in tank, around 15-20L per tank, this is all while the caravan is in the stationary position.
I think it is because the CERBO GX MK2 is only reading to one decimal place of the tank output voltage, for example 1.1V is basically empty, but 1.2V will change the tank level up 10 LITERS or so. Is there a way to get the CERBO to read to two decimal places? for example to read 1.12 being empty and 1.22 not being empty. I know it’s not vital but it would be handy to understand so I can relay to my customers.

2

I’m not sure about the number of decimals, but even at 0.1 you’d have 22 measurements from 0..85 liters, i.e. around 4 liters per step.

But i guess internally the cerbo is working with more decimals, but couldn’t find anything in the manual.

Maybe one of the victron experts can say more.