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Merry Xmas one and all
Heres a question for all you electrical buffs....how does the tempreture sender unit actually work, is it based on resistance????
What I've done is brought one of those Jaycar "tempreture switch" electrical kits to use as an adjustable control for my thermo fans as the automotive thermo switch I have is too close to my running temp for turning off (On @ 85 and off @ 80deg). With this new unit I can adjust the "on" level and also adjust the "hysteresis" cycle time. I have tested it and it works well. the only thing is it uses a "thermistor" coupling. A -40deg C to 300deg C NTC thermistor. I don't want any more wires and bits glued to my radaitor so can I use a twin terminal temp sender unit to replace the thermistor so it looks more factory.
I'm a mechanic not a electronics wizz so any help would be great.
Cheers
Darren
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The temp sender fitted to all Holdens that had a temp gauge, and commodores up until the end of VS, were of the resistance type.
They pick up earth through the sender body, and have a single terminal (earth referenced) output that varies with temperatu |
Cheers,
Mick
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does that mean I can use my original sender in place of the thermister, as they sound like they do the same thing. It runs 8volts and the thermister is a variable resister...the hotter it gets the less resistance.
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I would say so mate, the temp sender has a lower resistance with heat (thus moving the needle further up the gauge) so it would only be a matter of calibrating it to your kit.
You need to make sure your kit will accept a negative(earth) signal though.
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Cheers,
Mick
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Thanks heaps....the thermister uses a twin core sheilded wire which connects to 2x terminals on the pcb board. The resistor has no polarity and is soldered in series.
Have a great day
Darren
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You wouldn't happen to have the Jaycar catalogue number for this kit would you?
Regards, Jim... |
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Hi Jim
The kit number is #5381, cost $29.95....if you use this kit be carefull as the printed board and the wiring diagram show the VR1 1k (variable resistor) as having the adjustable trim screw at the top left hand corner, if you mount it this way it wi
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Thanks for that Darren. Im off to check my catalogue. |
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