Water Level Float And Gauge. (1 Viewer)

Nov 24, 2008
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Seeking advice from the electrical minded out there please.

I've installed a water level sender unit like this,
And a gauge like this

All wired up correctly but only says half full on the gauge when the tank is full and float is right at the top of its slider.

Am I missing something?
Do I need to calibrate the gauge? Can't see how though.

Thanks

Shawn
 
Aug 6, 2013
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It seems fairly short from the pic. If it only starts to read when the tank is half full then it will only see the increase from half full to full - in other words half the total contents. Or maybe it isn't as it appears.

Edit: I've just followed the link. Your water level must be vitally important to you 😳.

As a start what does it do when you operate it by hand out of the tank? Does it reach all the way to the bottom when installed?
 
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shawn&emma
Nov 24, 2008
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It seems fairly short from the pic. If it only starts to read when the tank is half full then it will only see the increase from half full to full - in other words half the total contents. Or maybe it isn't as it appears.

Edit: I've just followed the link. Your water level must be vitally important to you 😳.

As a start what does it do when you operate it by hand out of the tank? Does it reach all the way to the bottom when installed?

Thanks for replying. The link is not to the one I've got, Ours is 500mm in length. Yes it does reach to the bottom, about 10mm from bottom of tank. Slider moves freely up and down. No I haven't tried it out of water so will do that tomorrow. I've two gauges and tried both and they do the same.

Thanks.

Shawn

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EML

Sep 18, 2018
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Wild guess, short of seeing a manual or circuit diagram - have you got a 24V version that you're operating at 12V?
 

Two on Tour

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As you say the links are not the actual sender and the gauge you bought, then to me it sounds like you have a mis-match on the impedance between the sender and the gauge.
Are the sender and the gauge by the same manufacturer ?

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Nov 1, 2019
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shawn&emma Just a thought - if the sliding magnet has been off the tube (i think it is only prevented from coming off the bottom by the small filter) it has to go on the correct way up or will read incorrectly. I have known these yo be assembled wrongly from new. Hope you sort it.
 
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shawn&emma
Nov 24, 2008
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As you say the links are not the actual sender and the gauge you bought, then to me it sounds like you have a mis-match on the impedance between the sender and the gauge.
Are the sender and the gauge by the same manufacturer ?

Yes same manufacturer and linked to each other as a pair on their website.

The gauge is a Veethree fuel level gauge. Maybe that I need to contact them directly.

Shawn
 
Jul 29, 2011
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Yes same manufacturer and linked to each other as a pair on their website.

The gauge is a Veethree fuel level gauge. Maybe that I need to contact them directly.

Shawn
You just said it’s a fuel gauge!
The thread says water gauge, surely the liquids are a different viscosity!
Could that be the problem.

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EML

Sep 18, 2018
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Umm... you're not really helping by giving us the wrong links to the bits of kit you actually have. If you've got a Wema sender, like this one, then it probably has a 0-190R output. If you've got a Veethree gauge, like this one, then it requires a 33-240R sender, so the two are incompatible.

However, showing half-range for a max-level float is a red flag. Check that you haven't installed a couple of resistors as a voltage divider for use with a 24V system. Wema's webpage for the gauge you linked to shows an 'extra curcuit for 24V' which you should check for.
 
Apr 12, 2010
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Water level gauges are notoriously inaccurate. Ours only ever reads 3/4 full even when you’ve just filled it up. I can see the water level on our tank. Much more accurate.

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