I have recently bought 3 Star Tanj sensors and have installed 2 so far - very easy to hook up to the Cerbo GX. Happy so far, but I am struggling a bit with calibrating for the custom tank shapes, which all my tanks are.
I have the 3.7 beta software which is the only one that seems to allow for custom tanks with blue tooth sensors.
The Cerbo only allows you to input a percentage number for the sensor reading and then put in what I think the tank reading should be. I was doing this by filling slowly and adding the data points one by one.
I was taking the supposed sensor reading from the level on the display. However, does this mean that it was constantly recalibrating? If so it would seem that the new calibration points would be affecting everything and calibration would not be that accurate?
I would have thought that the more straightforward way would be to input the actual sensor reading in cm and then put in the percentage I would want that to represent? Maybe that is the correct way, but I would then need to calculate the sensor percentage and input that and then input the desired percentage reading for calibration. I can certainly do that, just want to understand the correct way to be doing this.
Thanks for any help
I could not find much in the manual but found this in the GX Tank 140 manual.
Custom shape
It is possible to configure custom shapes for non-linear shaped tanks using this setting.
For example: if a tank that is wider up top, the tank shape can be configured so that a sensor reading of 50% equals only 25% of volume.
Up to 10 positions can be set to accurately describe the relationship between sensor reading and tank shape, even for highly irregular tanks. The tank volume is linearly interpolated between positions.
To me this means that you have to convert the level reading in cm into a % value and then assign the volume % to this. The % reading on the display is the % volume so you should not be using this. Presumably you know the total volume and are measuring the volume flowing in.
Thanks for your thoughts on this. Yes, I know total volume and have a flow meter on fill hose to step by step fill it with known volumes.
Makes sense what you are saying. Just puzzled why the software wouldn’t make it simple by doing the percentage calculation. It displays the distance in cm from the sensor to current level of water and the tank depth is specified in set up, so would be simpler for user to input the distance in cm and then the correct volume. Perhaps because it is in Beta still.