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Old 15-03-2011, 14:14   #1
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Ohms Scale for European Sending Units

I need to replace a sending unit in one of my water tanks and am pretty sure that the ohm scale for European VDO gauges is 10-180 vs the US scale which is 240-33. Does this sound correct or do I have them backwards?

The existing sender is toast and the only markings on it I could read were 40/102 and 828/171 and 6.98. No idea what any of these mean but I do know that when I tried hooking up my new fuel gauge(American) to the boats existing sender (european) the gauge did not read correct so I replaced the sender with a US scale sender and all is well on the fuel tank. I dont want to replace my VDO water tank gauges just the sender.

Thanks,
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Old 15-03-2011, 14:19   #2
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You are correct , European senders can be 10 to 180 or there abouts

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Old 15-03-2011, 14:23   #3
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Re: Ohms Scale for European Sending Units

Right.
A Euro’ level switch water/fuel sender is 10 Ohms empty and 180 Ohms full.

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Old 15-03-2011, 14:24   #4
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Re: Ohms Scale for European Sending Units

Thanks guys! Sender ordered. Once again CF to the rescue!
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Old 15-03-2011, 14:25   #5
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Re: Ohms Scale for European Sending Units

SV, I would check with VDO since they do sell units on the US market, and I would expect that a "VDO gauge set" uses the same display and the same sender, regardless of the market it is shipped to. Or perhaps...all of their "metric" marked displays use a different standard?

Easier to call them and be sure.
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Old 16-03-2011, 09:29   #6
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Re: Ohms Scale for European Sending Units

All the existing level gauges on my boat were VDO and on the 10-180 scale. I bought a new engine instrument panel from TA Diesel and it came with a new fuel gauge but that gauge was on the US 240-33 ohm scale. So in that case I found it easier to replace the fuel tank sender with a US sender.

In this case it was my water tank gauge. I have two gauges and 4 tanks. Each gauge has a 3 way toggle switch to select off or one of the two tanks monitored. In one of my tanks the sender was not reading right and in my infinite wisdom I broke it. I did not want to change the gauge so I simply ordered a euro style sender to match the gauge and the other 3 tank senders.

Maybe one day I will hit the lottery and replace all the senders with NMEA 2000 units and tie them into a N2K network so I can see EVERYTHING my hammock on the bow...
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