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1Back to top Go down   Installing a water temperature gauge Empty Installing a water temperature gauge on Tue Jul 06, 2010 12:17 pm

robmack

robmack
Life time member
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Got this from the German K-bike technical site ( http://k-technik.pytalhost.com/pdf/wassertemp.pdf ). I thought it is useful to reproduce the information here in the BMW K100 forum for future reference.

Installing a water temperature gauge Tg1

First line in the Blue region is #1; Last line in the Red region is #8. The following resistances will deflect the needle on the temperature gauge to the given indicator line.
Indicator Line
Resistance (Ohm)
Notes
1
200
First line in the Blue region
2
150

3
100

4
70
Reg's White dot
5
50
Reg's Red dot
6
40
Cooling fan should engage
7
30

8
25
Last line in the Red region
The aproximate resistance values measured at the water temperature thermocoupler on the water pump for certain engine conditions are as follows:
Engine temperature = 10 Celcius ~ 1.3 Kohm
Engine temperature = 20 Celcius ~ 250 Ohm
Normal Engine Operating temperature ~ 70 Ohm

I am uncertain whether the thermocoupler is linear or non-linear in its response (which may match a linear or non-linear response in the gauge) However, with this technical information it should be possible to calibrate a non-BMW temperature gauge to the BMW thermocoupler sensor. A suitable test bed for such a calibration will look like this (taken from the document above):
Installing a water temperature gauge Temp-t10


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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