Author Topic: One wire temperature sensor - need help wiring  (Read 2174 times)

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Offline darthekai

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One wire temperature sensor - need help wiring
« on: March 31, 2017, 11:59:13 PM »
I have a motorcraft single wire temperature sensor on my tractor motor, and i want to use it to turn on a fan. As far as i can tell, it's resistive ie the resistance drops as it heats up. I have a relay to turn on the fan on a switch, do I need a pot or something to set a "trigger" resistance? Or can I simply run the ground from the relay coil into the sensor?

Interbutts aren't much help.

A bit out of my wheel house with this whole 1 wire dealy.

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Offline RockThePylon

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Re: One wire temperature sensor - need help wiring
« Reply #1 on: April 01, 2017, 12:15:35 AM »
You have an NTC thermistor, and you want a relay to click when the thermistor resistance reaches a set point?
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Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #2 on: April 01, 2017, 12:25:35 AM »
Hmm I guess so.
It used to drive the dash temperature gauge. I suppose it's grounded through the threads.
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Offline RockThePylon

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Re: One wire temperature sensor - need help wiring
« Reply #3 on: April 01, 2017, 08:56:08 AM »
If you don't need/want it to read water temperature, replace it with a switch. Might be the least hassle.

Otherwise, you'll probably need a circuit to trigger the relay. A temp sensors resistance will be pretty high, I doubt it'll ever flow enough current on it's own.
I may scream like a dainty lady, but I punch like a fairly strong 11-year-old.

Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #4 on: April 01, 2017, 12:21:04 PM »
I was considering re-wiring this to trigger the relay.

https://www.amazon.ca/gp/product/B00BLZ93T2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1


The biggest problem is that I cannot find a "coolant temp switch" that tells me what temperature its going to switch at.
Descriptions are all as helpful or less than this:
http://www.autozone.com/cooling-heating-and-climate-control/temperature-switch/duralast-temperature-switch/128785_0_0_5673
What man put together, man can rend asunder and then also put it together sometimes what's all this left over stuff
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Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #5 on: April 01, 2017, 02:14:55 PM »
so since my car runs a 195 tstat, I should get a thermo switch between 205/215 and 215/225. Apparently, because auto value forest lawn uckfayin rocks and they have mountains of old books, a GM 25037089 is a 2 wire bladed thermo switch with a 3/8" NPT connection that operates over 210/219. Otherwise known as TS217.

This is not available anymore:( but it is listed as in Chev 87-83 and pontiac 87-83 theinternet tells me that this part should be in a firebird 82-91, transam 92, or camaro 82-92. The old dudes memory says "in those ohh 2.8? 2.0? pontiacs and chev s series? maybeee a sunbird, citation, or a celebrity, something like that. Yeah, look for those small engine front wheel 80s cars".

So i might do a trip to PnP later this afternoon.
What man put together, man can rend asunder and then also put it together sometimes what's all this left over stuff
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Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #6 on: April 14, 2017, 07:04:42 PM »
I should just do this. This seems like a way better option

Unless it's like a hundred dollars.

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Offline RockThePylon

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Re: One wire temperature sensor - need help wiring
« Reply #7 on: April 14, 2017, 10:55:05 PM »
That's what I meant by switch. A temperature sensitive one.
I may scream like a dainty lady, but I punch like a fairly strong 11-year-old.

Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #8 on: April 15, 2017, 05:08:53 PM »
hmmmm  of course the only one of the car i want is in the middle of a lake. But it gave up some goods.
The real question is, I tested it and it was OL on resistance up till about 160F then started falling up to 100C. I added some salt but the highest I could get was 190Ohms.
IS THIS IN FACT A TEMPERATURE SENSOR NOT A GODDAMN FAN SWITCH? based on the fact that the dash has a temperature GAUGE, yes. :(

plz respond.








Is it wrong I kind of like this car?





I saw some gems in the parking lot. A turbo VW wagon, a VW with a limited edition ARIZONA exhaust tip, and a super expensive landrover but the owner decided to build a snorkel out of stuff he found under his sink?




What man put together, man can rend asunder and then also put it together sometimes what's all this left over stuff
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Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #9 on: April 15, 2017, 05:12:11 PM »
Update: I am dumb. Wasted $6.


What man put together, man can rend asunder and then also put it together sometimes what's all this left over stuff
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Offline RockThePylon

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Re: One wire temperature sensor - need help wiring
« Reply #10 on: April 15, 2017, 07:21:40 PM »
That sounds like a sensor, not a switch. Even though 190ohms is pretty low for a sensor.

Just go to Mopac and ask them. They probably have 100 of what you need.
I may scream like a dainty lady, but I punch like a fairly strong 11-year-old.

Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #11 on: April 15, 2017, 09:03:23 PM »
You'd think that but no.  the best they can do is say painless fan wiring kit which is a disgusting $80. They have one yes one Thermo switch and it's like $16 but it's for the wrong temperature range something like 160 degrees Fahrenheit to 180 degrees Fahrenheit
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Offline RockThePylon

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Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #13 on: April 15, 2017, 09:46:57 PM »
Ok..  but that's not a very convoluted solution.  >:(
What man put together, man can rend asunder and then also put it together sometimes what's all this left over stuff
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Offline RockThePylon

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Re: One wire temperature sensor - need help wiring
« Reply #14 on: April 15, 2017, 11:20:59 PM »
I thought you wanted to tap off the sensor your ECU uses to read coolant temp, and have that trigger the fan. I assumed you were limited by bungs or whatever to tap into and wanted to DIY some solution for fun.

But if you have a hole to stick it in, and just want something that switches on and off when your coolant reaches a temperature. Well, that itshay is cheap and easy and everywhere.
I may scream like a dainty lady, but I punch like a fairly strong 11-year-old.

Offline darthekai

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Re: One wire temperature sensor - need help wiring
« Reply #15 on: April 16, 2017, 11:15:37 AM »
I am trying this new thing where I make do with what I have cuz like I have so much random junk.

But I was fully committed to a narrative that a switch at the right temp range is impossible to get or expensive.
For $8 that's a pretty good solution. Although I wish it was two wire.
What man put together, man can rend asunder and then also put it together sometimes what's all this left over stuff
Subaru Ford (sold) Toyota