I am monitoring a water tank (~2000 L total capacity) using a resistive level sensor connected to a Victron GX analog input and visualized in VRM. The tank level graph shows significant step changes of approximately 117 liters instead of a smooth continuous variation. The values remain flat for a period and then jump abruptly, creating a staircase-like profile. This behavior seems excessive for the tank size and suggests low effective resolution or quantization in the measurement system. I would like to understand if other users have experienced similar large step sizes and how they have improved the resolution or accuracy of their tank level readings.
Hello,
This is most likely to do with the type of sensor in your tank.
For example the very common Wema sensors used in many production yachts called the S5 fuel and water sender (https://wema.co.uk/products/fuel-sender-s5-5-bolt), can be ordered in standard or High resolution.
Basically the sender is a tube with a float around it, and inside the tube there are some sensors. The standard has fewer sensors, lets say one every 50mm and the high resolutiuon one has for example one every 10mm.
The 10mm gives a smaller step change.
Now there are other types of sender that use ultrasonic or radar that might be able to give better resolution.
I hope that helps.
Alex
PS my Beneteau groupe catamaran has wema standard resolution senders, and I am thinking about upgrading them…