Water and Fuel Tank calibration
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 460
Forum Description: Model Hints, Tips and News
URL: https://www.myhanse.com/forum_posts.asp?TID=14725
Printed Date: 27 March 2026 at 01:44
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: Water and Fuel Tank calibration
Posted By: mr-ludi
Subject: Water and Fuel Tank calibration
Date Posted: 17 July 2024 at 12:08
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I have measured some calibration points of the two tanks. Maybe some other users can add more datas, especially of the fuel tank?! Water: Sensor: SH220 [0412] 1 Capacity: 450 Liter 0-209L: 3-4 Ohm (it can‘t measure <210L) 210L: 17 Ohm 250L: 44 Ohm 300L: 71 Ohm 350L: 112 Ohm 400L: 159 Ohm 425L: 178 Ohm (maximum, it can‘t measure >425L) Fuel: Sensor: SH220 [0412] 3 Capacity: 200 Liter 115L: 151 Ohm The datas of the water tank shows, that the sensor is able to measure from 210-425L. It‘s a range of 215L (47,8%) from a 450L tank. Bad, what Hanse is selling at this point… |
Replies:
Posted By: Keakaka
Date Posted: 18 July 2024 at 00:36
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We have the same problem on our 460 for over a year. Our agent is talking to Hanse about a fix but they think it is not possible for the water as the tank is on a slope and not even size. We show 30% water when there is actually 70%. This is a major problem when we have others on board as we have no idea about water levels. We are going to try a different sensor maybe using pressure not probes or else a sight tube so we can see the level. https://wema.co.uk/products/fuel-sender" rel="nofollow - https://wema.co.uk/products/
https://wema.co.uk/products/nmea2000-n3-sender" rel="nofollow - https://wema.co.uk/products/ Fuel is not a problem as we work off engine hours at 5 litres per hour average. Very disappointing responses from Hanse on this and the anchor chain buildup problems. ------------- This is not a rehearsal. Go for it. Kiakaha |
Posted By: mr-ludi
Date Posted: 18 July 2024 at 07:14
I don’t have that problem. Our sensor/tank combination works well between 215L and 425L (48% to 94%). But if we have less than 215L, the sensor can‘t measure it any more.
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Keakaka wrote:Posted By: S&J
Date Posted: 18 July 2024 at 21:20
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It sounds like the sensor is too short. They come in different lengths. From memory my 458 with a 450l tank has either 30 or 35cm sensor. The original supplied by Hanse failed in my 3rd season however the €40(?) drop in replacement has proved much more accurate. The original showed 100% until about 60% usage when it started measuring correctly (but obviously based on just the 69% volume.)
------------- H458 #159 Primal Mediterranean cruising |
Posted By: ariette
Date Posted: 19 July 2024 at 07:09
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Ludi On the fuel tank I can add 210 litres 191 ohm 140 litres 171 ohm Thanks for your water numbers
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Posted By: mr-ludi
Date Posted: 19 July 2024 at 08:23
I measured my fuel data by checking the ohm number before refueling and counting the liters from full tank. Did you do the same? My display was configured by 210L capacity. But all specifications for the H460 are showing a fuel capacity of 200L. What is correct?
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Posted By: ariette
Date Posted: 19 July 2024 at 10:42
| Yes I did the same. I don't know which is correct. The documentation mentions both 200 and 210 litres and my dealer doesn't know the answer. |
Posted By: mr-ludi
Date Posted: 20 July 2024 at 11:24
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If we trust in the documentation, it‘s a 200L tank. This would meand we have 151 ohm @ 115L 171 ohm @ 130L For me it looks time the sensor will reach the maximum of 191 ohm much earlier than @ 200L… 🙄 I will try to refill as slow as possible next time and get more datas.
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Posted By: S&J
Date Posted: 20 July 2024 at 16:01
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458 has a 210l diesel tank. Maybe some documents didn't get corrected for 460? ------------- H458 #159 Primal Mediterranean cruising |
Posted By: mr-ludi
Date Posted: 20 July 2024 at 16:25
I think it‘s the opposite. I haven‘t seen any document showing 210L for the 460. The only reason to think about 210L is the display, which shows a maximum volume of 210L. Maybe the display is copied from the 458?!
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Posted By: ariette
Date Posted: 22 July 2024 at 06:59
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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 |
Posted By: mr-ludi
Date Posted: 25 July 2024 at 13:45
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Next one, still calculating with a total of 200L: 94L @ 117 ohm
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Posted By: DCJ
Date Posted: 25 July 2024 at 14:02
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Fuel: 23 ohms is 23 litres 11%. We need to fill up, wondered if it was possible to note the readings during refuelling? ------------- Colin |
Posted By: mr-ludi
Date Posted: 25 July 2024 at 16:55
Did you fill up 177 litres or 187?
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Posted By: Sahinsair
Date Posted: 01 September 2024 at 14:27
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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 ?
------------- Sailing Sufi |
Posted By: mr-ludi
Date Posted: 01 September 2024 at 14:46
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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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Posted By: Sahinsair
Date 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 ? |
Posted By: mr-ludi
Date Posted: 01 September 2024 at 15:50
| I can help you, if you answer my three questions. |
Posted By: Sahinsair
Date Posted: 23 August 2025 at 23:16
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Ok. I will look and answer your questions Ludi. ------------- Sailing Sufi |
Posted By: Ian Coverdale
Date Posted: 25 August 2025 at 09:14
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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 |
Posted By: Keakaka
Date Posted: 26 August 2025 at 01:16
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The Owners Manual says 210 Litres approx. for fuel and 450 L approx for water. It notes that all the fuel capacity may not be available to use so a reserve of 20% should be kept. We replaced the original senders with a pressure sensing unit and that has been accurate across the range. For fuel I monitor engine hours and budget 5 Litres per hour at 2200 RPM - it is usually closer to 4 litres per hour. ------------- This is not a rehearsal. Go for it. Kiakaha |
Posted By: Black Diamond
Date Posted: 26 August 2025 at 02:19
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On our 575 I replaced all the resistance based sensors (fresh water, black water, fuel, etc) with maretron ultrasonic sensors. Less chance of something getting stuck. These are voltage based sensors so the calibration process is the same but with different values. Its worked like a champ so far. ------------- Rick S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
Posted By: Sahinsair
Date Posted: 19 September 2025 at 19:30
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Thqnk you Ludi. I entered the values you provided. I hope I can get near-accurate measurement information. When I asked the same question to chat cpt, he also gave me some additional 25% off-set values. He also gave me 10% off-set values. Do you recommend I enter those as well?
------------- Sailing Sufi |
Posted By: mr-ludi
Date Posted: 20 September 2025 at 08:17
| What additional values did you get? |
Posted By: Black Diamond
Date Posted: 20 September 2025 at 12:26
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Rather than trust someone’s values, what i did was buy $6 flow meter from amazon. If you know the size of the tank, you can capture readings every 10 gallons or so. Litres if that is what you use.  Not saying they are wrong, just another way to do it. Load 10 gallons, take a reading. Load another 10, take a reading. That way you know they are right for your boat. I got 10 calibration points this way. Oh.. and for fuel, that's what the diesel pump reads. Just stop every X gallons and take a reading.. ------------- Rick S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |