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Author: Subject: Digital water gauge problem
wandr

posted on 16/11/17 at 10:47 PM Reply With Quote
Digital water gauge problem

Hi all , I have fitted a simoni digital water temperature gauge and have a strange problem that the gauge reads 40 degrees when the engine is stone cold, demon tweeks have told me they think it is an issue with the sender and said put PTFE tape around the thread, this has not worked sender is brand new, earth for the gauge is good and it is wired to live ok, when I disconnected the sender wire completely it still read 40 degrees, any one have any ideas?
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ian locostzx9rc2

posted on 17/11/17 at 07:26 AM Reply With Quote
Faulty gauge I guess
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coyoteboy

posted on 17/11/17 at 07:51 AM Reply With Quote
What did they hope ptfe tape would do?





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ian locostzx9rc2

posted on 17/11/17 at 08:05 AM Reply With Quote
Thatís a mystery!
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pekwah1

posted on 17/11/17 at 09:39 AM Reply With Quote
My digital temp gauge (not a simoni) is identical, seems to have a minimum reading of 40 degrees also.
It doesn't really bother me to be honest, works perfectly well otherwise

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MikeR

posted on 17/11/17 at 11:30 AM Reply With Quote
absolute guess here but ...

The gauge is reading a resistance value from the sender. Either the sender base / starting resistance is the same as 40 degrees OR the gauge doesn't do any values below 40 degrees.

Is it really a problem?

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coyoteboy

posted on 17/11/17 at 12:47 PM Reply With Quote
Often they'll match the curve to the operational range so you get better accuracy at that location, at the sacrifice of the extremes you don't care about. So it is distinctly likely it's just how it's meant to work. But if it's a matching gauge you'd expect that to have no readings below 40C just so customers don't ask!





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ian locostzx9rc2

posted on 17/11/17 at 01:00 PM Reply With Quote
Seems a rubbish if it starts at 40 degs but I guess as long as itís accurate when you want it to be thatís the most important thing .
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David Jenkins

posted on 17/11/17 at 02:20 PM Reply With Quote
I think PTFE tape could stop it working, if the temp sender uses the engine block as the earth return. It's a vague chance, but I'd only use PTFE if there were any signs of water leaks.





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wandr

posted on 17/11/17 at 03:12 PM Reply With Quote
Hi all, the PTFE tape was suggested by Demon tweeks as they thought there might be an poor earth path from the sender but it does it with or without so maybe it's just meant to start at 40, doesn't really matter I guess, by the sound of some posts I might get another and it will be exactly the same, I
haven't used digital before so I was assuming that they would all start at zero like standard gauge types, many thanks as always for all your help and replies

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02GF74

posted on 17/11/17 at 06:48 PM Reply With Quote
Most gauges aren't marked and you assume that when the needle is at the minimum position that represents 0 degrees. I'll bet it does not.
Also the water temperature when the needle starts to move is probably well above 0.

If the gauge shows correct temperature when engine has warmed up I. E. Thermostat has opened, it is working correctly.





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