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Water and Fuel Tank calibration
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ariette View Drop Down
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Joined: 12 August 2013
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Points: 202 		Post Options Post Options   Thanks (1) Thanks(1)   Quote ariette Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2024 at 06:59
From tech spec in brochure
Fuel tank approx. 210 l 55 gal
Fresh water approx. 450 l 119 gal
CE Certificate A -10 ocean
From owners manual
Fuel tank
Tank capacities
approx. 200 l
approx. 450 l 

It's definitely one or the other 
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mr-ludi View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mr-ludi Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2024 at 13:45
Next one, still calculating with a total of 200L:
94L @ 117 ohm
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DCJ View Drop Down
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Points: 36 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DCJ Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2024 at 14:02
Fuel: 23 ohms is 23 litres 11%.

We need to fill up, wondered if it was possible to note the readings during refuelling?
Colin
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mr-ludi View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mr-ludi Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2024 at 16:55
Originally posted by DCJ DCJ wrote:

Fuel: 23 ohms is 23 litres 11%.

We need to fill up, wondered if it was possible to note the readings during refuelling?
Did you fill up 177 litres or 187?
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Sahinsair View Drop Down
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sahinsair Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2024 at 14:27
I have problem fresh water tank. It doesnt show more than 203 liter. And I dont now what to do. The dealler said that may be the ball tuching some things. Do you think is it true?If so  How can I reach there ?

Edited by Sahinsair - 19 September 2025 at 19:21
Sailing Sufi
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mr-ludi View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mr-ludi Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2024 at 14:46
What is the maximum capacity in the settings?
How much „Ohm“ does it show when filled completely?
Which calibration points did you install?
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Sahinsair View Drop Down
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sahinsair Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2024 at 15:00
I didint touch any calibrations and ut was working before Ludi. Do you think uts only calibration issue ?
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mr-ludi View Drop Down
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Points: 152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mr-ludi Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2024 at 15:50
I can help you, if you answer my three questions.
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Sahinsair View Drop Down
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sahinsair Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2025 at 23:16
Ok. I will look and answer your questions Ludi.
Sailing Sufi
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Ian Coverdale View Drop Down
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Points: 311 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2025 at 09:14
Fuel tanks are a complex geometry to measure volume accurately using off-the-shelf level sensors which assume a rectangular tank.

The graph below I posted elsewhere with a detailed description so will not repeat here but shows the very non-linear relationship on our 445 with WEMA sensor. Alarmingly with 30% on the gauge we only have 20-litres of useable fuel and our 220-litre tank only has 180-litres of accessible fuel including the fill hose volume. 

As we have Victron Cerbo measuring fuel and water volumes, we have used the calibrate functions to accurately show correct fuel volume and this is the answer to your problem ... you will not fix the sensor reading without purchasing an expensive custom sensor, you need digital display with calibration functions and calibrate it properly. Maybe Hanse should be doing that on new boats?
Ian & Andrea
SV Gabrielle (H445)
Liveaboards - currently Montenegro.
www.facebook.com/sailinggabrielle
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