Worth DC Panel, incorrect h20 reading

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   Hi all,
I have filled up the fresh water tank on my H458 but the digital display on the Wurth Panel reads 37%.

I have turned power on and off but it remains at 37%.

How do you recalibrate the sensor to read 100%, there was no manual for the sensor in our boat pack.

Thanks and Merry Christmas

Dave

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dave grindle Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 27 December 2021 Location: New Zealand Status: Offline Points: 22	Post Options Post Reply Quote dave grindle Report Post Thanks(0) Quote Reply Topic: Worth DC Panel, incorrect h20 reading Posted: 24 December 2022 at 00:24
	Hi all, I have filled up the fresh water tank on my H458 but the digital display on the Wurth Panel reads 37%. I have turned power on and off but it remains at 37%. How do you recalibrate the sensor to read 100%, there was no manual for the sensor in our boat pack. Thanks and Merry Christmas Dave
	Grins H458 # 189

marsella Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592	Post Options Post Reply Quote marsella Report Post Thanks(0) Quote Reply Posted: 24 December 2022 at 01:54
	The original sensors on 458 are voltage based (I wired them in parallel to GX Tank Monitor 140 to transmit the data online) I think 100% filled water/diesel is 3.9V or close to it. The first thing to check is the actual voltage that the sensor sends to the display panel, (wiring at the back of the panel can be easily seen), 37% would corresponds to 3.9*0.37=1.44V and 100% is 3.9V, so maybe its a display problem and not the sensor. Cheers!

Fendant Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671	Post Options Post Reply Quote Fendant Report Post Thanks(0) Quote Reply Posted: 24 December 2022 at 08:00
	Unlikely that this is a voltage based sensor. Most likely your sensor does not work Most marine fluid level sensors are measuring resistance, fed by 12 V. Tank empty 0 Ohm ( sometimes 30 Ohm ) Tank full 180 Ohm valid for fresh water, fuel. If your fuel readings are correct on the Würth panel, the you need to replace the crappy cheapo level arm sensor which Hanse installs by a magnetic rod sensor. ( there are numerous post here in the Forum ). Remove the two pin plug at the panel and measure the resistance. These mechanical arm s work in cars with bumps but always get stuck in a boat fuel tank Only for black water tanks magnetic rod sensors are the other way round ( full is o Ohm, empty 180 Ohm ). However resistance sensors are totally unreliable for the s...t tank. Hanse installs in the newer contact less models, an acoustic sensor system measuring from the outside from Gobius, Sweden, which give these readings through a junction box, The third way for reliable black water readings are ultrasonic sensors. The principle is the same as the bumper beeper in your car. They need also a special converter box and monitor.
	Frank

marsella Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592	Post Options Post Reply Quote marsella Report Post Thanks(0) Quote Reply Posted: 24 December 2022 at 13:59
	Mine is voltage based, 458#80 production Jan 2020; the sensor wiring at the back of the panel shows zero resisance but voltage about 3.9V when tanks are full...Cheers!

G8WVW Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 09 August 2019 Location: UK Status: Offline Points: 160	Post Options Post Reply Quote G8WVW Report Post Thanks(0) Quote Reply Posted: 24 December 2022 at 15:06
	How many wires are there connected to your sensor?
	Andrea & Ian Aboard SV Gabrielle (H445 #164) Portishead, SW England.

Minibusdriver Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 19 June 2021 Location: UK Status: Offline Points: 42	Post Options Post Reply Quote Minibusdriver Report Post Thanks(0) Quote Reply Posted: 04 January 2023 at 13:53
	had issues with our water tank gauge sensor too.. Failed after six months on a new boat 😳. The issues as others have indicated is the cheap sensor. Ours sticks at 67% frequently but then works ok for a few weeks before failing again. Replacing it is on the jobs list, although I suspect it’s life will be equally short lived.

Alex75 Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 10 February 2022 Location: France Status: Offline Points: 106	Post Options Post Reply Quote Alex75 Report Post Thanks(0) Quote Reply Posted: 04 January 2023 at 14:06
	moi aussi j’ai remplacé le mien e il y a un mois et un facture de plus de 150€ Il restait bloqué à 000



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