The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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PostPosted: Sun Oct 18, 2015 11:36 am 
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There are a lot of after market water temp; transmitters about.
This is what an original one should look like.
When cleaned off the body should be in copper, not brass and etched on the casing are the words
" Smiths Industries LTD. Made in U.K. " .
The resistance should be about 900 ohms at room temperature.
Tony.

Edit July 2018 : These temperature senders have a problem after use for some years. The earthing for the gauge / sender is from the copper sensor casing to the mild steel of the threaded section. Over time this connection deteriorates and the gauge reading drops from normal. The solution is to use silver loaded epoxy on the join between the copper and the steel after cleaning it up. In my case the earthing resistance was around 300 ohms. Cleaning and adding the silver epoxy reduced this to <1 ohm.

And some measurements.
1. A set of data points relating water temp; gauge reading to the simulated temperature sender resistance with constant 13.5V in to the mechanical voltage stabiliser ( nominal 10V output) with a simulated load of 150 ohms for the fuel gauge.

First indication : 180 ohms.
"1/4" on the gauge : 100 ohms.
"1/2" = N on the gauge : 68 ohms.
"3/4 on the gauge : 47 ohms.
Full scale : 22 ohms.

So, very non-linear


Attachments:
orig temp tx.JPG
orig temp tx.JPG [ 64.35 KiB | Viewed 1528 times ]


Last edited by MIG Wielder on Tue Jul 10, 2018 5:07 pm, edited 1 time in total.
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PostPosted: Sun Oct 18, 2015 3:43 pm 
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Thanks Tony.

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PostPosted: Mon Oct 19, 2015 4:40 am 
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Future Club member hopefully!
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Location: Dalgety Bay, Fife, Scotland
Excellent! Many thanks.

Kind Regards

Russell

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Russell A Macfarlane
Dalgety Bay, Fife, Scotland
1973 (L) Triumph Dolomite 1850 Manual (Non OD), Old English White
2012 (12) Vauxhall Insignia 1800 Exclusiv, Manual (Non OD!!), Technical Grey


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PostPosted: Tue Jan 19, 2016 8:59 pm 
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How do we get hold of one? The only ones that seem to be available are the generic ones which were made for the Series Land Rovers.

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Toledo Man

West Yorkshire Area Organiser & forum moderator
Meetings take place on the 1st Wednesday of every month at The Hollies Sports & Social Club, 12 Hough Lane, Bramley, Leeds, LS13 3NE
1972 Dolomite 1850 auto (NYE 751L - The rolling restoration)
2008 Citroën C4 Grand Picasso 2.0 HDi Exclusive (MA08 WCL - the modern)
Former stable of SAY 414M (1974 Toledo), GRH 244D (1966 1300fwd), CDB 324L (1973 1500fwd), GGN 573J (1971 1500fwd), DCP 625S (1977 Dolomite 1300) & LCG 367N (1975 Dolomite Sprint) plus 5 Acclaims and that's just the Triumphs!

Check my blog at http://triumphtoledo.blogspot.com

"There is only one way to avoid criticsm: do nothing, say nothing and be nothing." Aristotle


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PostPosted: Wed Jan 20, 2016 7:13 pm 
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NOS? dunno.

Buy replacements from Robsport, as posted elsewhere on the forum.


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PostPosted: Wed Jan 27, 2016 7:59 am 
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LD Parts (Stag specialist) do a temperature sender which might be suitable. They reckon it should work as intended.

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Toledo Man

West Yorkshire Area Organiser & forum moderator
Meetings take place on the 1st Wednesday of every month at The Hollies Sports & Social Club, 12 Hough Lane, Bramley, Leeds, LS13 3NE
1972 Dolomite 1850 auto (NYE 751L - The rolling restoration)
2008 Citroën C4 Grand Picasso 2.0 HDi Exclusive (MA08 WCL - the modern)
Former stable of SAY 414M (1974 Toledo), GRH 244D (1966 1300fwd), CDB 324L (1973 1500fwd), GGN 573J (1971 1500fwd), DCP 625S (1977 Dolomite 1300) & LCG 367N (1975 Dolomite Sprint) plus 5 Acclaims and that's just the Triumphs!

Check my blog at http://triumphtoledo.blogspot.com

"There is only one way to avoid criticsm: do nothing, say nothing and be nothing." Aristotle


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