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Old 10-05-2017, 12:28   #1
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Boat: lagoon 400s2
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fresh water level sensor

Hi All,
Who can tell me how to locate the fresh water level sensor in the watertanks of a L400, and how to test/clean them ? My gauge tells me my tanks are empty, however my Dessalator seems to be working fine, and knocking on the (blue, non see-through plastic) tanks does not return a hollow sound ... Before I lift my anchor and sail into a marina to fill my tanks there to check things, any advice on this please ?
Thanks in advance !
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Old 10-05-2017, 14:36   #2
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Re: fresh water level sensor

Sensors are on port side (of port tank if you have two tanks). Cables run from sensor to a junction box , adjacent to tank. Access isn't that easy.

I would firstly try removing cable plugs into junction box to see if there is any corrosion. Perhaps just pulling plugs out & reinserting them a few times might improve contacts.

Good luck.
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Old 10-05-2017, 22:47   #3
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Location: Boat in Greece, Beach cat in Israel
Boat: Lagoon 400 & Nacra 6.0 beach cat
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Re: fresh water level sensor

One additional thing.
On our boat (2011 vintage) the sensors/gauge jumps in quarter tank values, i.e.it shows full, 3/4, 1/2 and empty, not exact values.
If gauge shows 1/2 it means that there is anything between 1/4 to 1/2 tank of water.
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Old 11-05-2017, 05:54   #4
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Re: fresh water level sensor

Thanks feebs, located the sensor on the port side tank and unplugged the cables a few times, and after wriggling them some more on the top of the port tank I got a reading again on the gauge. So it was a bad contact ... the cables are indeed difficult to access, like most if not all of the boats intestants ... but hey, happy days again !
@meirriba : the gauge on my 2014 boat is exactly like yours and jumps in quarterly values as well.
Thanks for the help guys !
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