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reluctantartist Samba Member
Joined: August 13, 2006 Posts: 1927 Location: Bloomington, IN
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Posted: Sun Dec 28, 2014 2:31 pm Post subject: ba4 thermal resistor |
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Does any one know where to get a thermal resistor for the temperature sensor or a replacement sensor? _________________ 1982 Westy, 1974 412 Variant... Yes, Aircooled's are great! Oh and I do have modern computer controlled vehicles too, but I just don't care about them.
Last edited by reluctantartist on Sun Dec 28, 2014 8:38 pm; edited 1 time in total |
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raygreenwood Samba Member
Joined: November 24, 2008 Posts: 21474 Location: Oklahoma City
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Posted: Sun Dec 28, 2014 2:45 pm Post subject: |
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Which sensor.....the one that protrudes into the flame chamber or the one in the heater channel?
Ray |
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bradself Samba Member
Joined: January 13, 2013 Posts: 167 Location: SF, CA
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Posted: Sun Dec 28, 2014 2:49 pm Post subject: Re: ba4 thermalike resistor |
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reluctantartist wrote: |
Does any one know where to get a thermal resistor for the temperature sensor or a replacement sensor? |
There are 012s very cheap on RockAuto, and I use resistors from Radioshack. Look under "Engine" at Rockauto, not injection or electrics. |
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raygreenwood Samba Member
Joined: November 24, 2008 Posts: 21474 Location: Oklahoma City
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Posted: Sun Dec 28, 2014 6:06 pm Post subject: |
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Thanks for the information. Just so you know what he is talking about (you may never use your gas furnace where you live)....there is a thermistor of a very specifc form and wiring pattern that plugs into the heater channel on the drivers side rear near the heater fuel pump. The system will nit run without it if its broken or too far off.
Also there is a temp probe just like you find in a natural gas furnace or hot water heater with 4-6 wires in the combustion chamber. It will not run if its bad. There are some options. Ray |
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reluctantartist Samba Member
Joined: August 13, 2006 Posts: 1927 Location: Bloomington, IN
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Posted: Sun Dec 28, 2014 8:37 pm Post subject: |
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I am talking about the sensor in the heater channel. I was cleaning it and the resistor disintegrated. _________________ 1982 Westy, 1974 412 Variant... Yes, Aircooled's are great! Oh and I do have modern computer controlled vehicles too, but I just don't care about them. |
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raygreenwood Samba Member
Joined: November 24, 2008 Posts: 21474 Location: Oklahoma City
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Posted: Sun Dec 28, 2014 9:29 pm Post subject: |
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reluctantartist wrote: |
I am talking about the sensor in the heater channel. I was cleaning it and the resistor disintegrated. |
I beleive its two thermistor s hooked in series and coated in epoxy. It should not be hard to make.....but I may have a spare. PM me. Ray |
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Lars S Samba Member
Joined: October 04, 2007 Posts: 780 Location: Sweden
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Posted: Mon Dec 29, 2014 1:35 am Post subject: |
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Wouldnt be to hard to find/make, the caractersic above and under +60deg C could be tested out, It should not have to be accurate far from +60C.
Made a quick test at my own sensor today, it showed to be a NTC (negative teperature coefficient; Rising temp - falling Ohms) thermistor and it gave these approx results:
104F/40C 10kOhm
122F/50C 6,5kOhm
140F/60C 5,5kOhm
158F/70C 3,5kOhm
176F/80C 2,5kOhm
/Lars S _________________ Porsche 914 -72, Bahia Red daily driver
VW411 2-d -70, White, sold
VW412 4-d, -73, Gold Metallic, daily driver
Suzuki T500, -69, Candy Gold, sold
Suzuki K50, -77, Black, daily driver
BMW R69S -69, White, sold
Husqvarna 118cc, -47, Black, Sold |
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raygreenwood Samba Member
Joined: November 24, 2008 Posts: 21474 Location: Oklahoma City
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Posted: Mon Dec 29, 2014 7:23 am Post subject: |
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Lars S wrote: |
Wouldnt be to hard to find/make, the caractersic above and under +60deg C could be tested out, It should not have to be accurate far from +60C.
Made a quick test at my own sensor today, it showed to be a NTC (negative teperature coefficient; Rising temp - falling Ohms) thermistor and it gave these approx results:
104F/40C 10kOhm
122F/50C 6,5kOhm
140F/60C 5,5kOhm
158F/70C 3,5kOhm
176F/80C 2,5kOhm
/Lars S |
Thank you for testing! I am going to test one of mine as well so we can compare to yours. I dont think it will be very hard to make either.
Agreed.....it does not have to be too accurate....just to have a decent range spread to allow even heating. Ray |
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reluctantartist Samba Member
Joined: August 13, 2006 Posts: 1927 Location: Bloomington, IN
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Posted: Mon Dec 29, 2014 7:03 pm Post subject: |
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Thanks Lars. I was able to use that data to pick up a variety of thermistors from mouser to try. I went to the electronic place here and the guy laughed at me. He had not had any call for thermistors in a very long time...looks like even the simple little parts are becoming rare. I will let everyone know what I come up with later this week _________________ 1982 Westy, 1974 412 Variant... Yes, Aircooled's are great! Oh and I do have modern computer controlled vehicles too, but I just don't care about them. |
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Lars S Samba Member
Joined: October 04, 2007 Posts: 780 Location: Sweden
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Posted: Mon Dec 29, 2014 11:42 pm Post subject: |
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reluctantartist wrote: |
Thanks Lars. I was able to use that data to pick up a variety of thermistors from mouser to try. I went to the electronic place here and the guy laughed at me. He had not had any call for thermistors in a very long time...looks like even the simple little parts are becoming rare. I will let everyone know what I come up with later this week |
Made a quick search at Vishay.com, the one in the middle column is pretty close.
Link to datasheet: http://docs-europe.electrocomponents.com/webdocs/07eb/0900766b807eb3ba.pdf
/Lars S
_________________ Porsche 914 -72, Bahia Red daily driver
VW411 2-d -70, White, sold
VW412 4-d, -73, Gold Metallic, daily driver
Suzuki T500, -69, Candy Gold, sold
Suzuki K50, -77, Black, daily driver
BMW R69S -69, White, sold
Husqvarna 118cc, -47, Black, Sold |
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reluctantartist Samba Member
Joined: August 13, 2006 Posts: 1927 Location: Bloomington, IN
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Posted: Fri Jan 02, 2015 4:31 pm Post subject: |
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Well I fixed it and it works even better now. I think it was on its way out before. I ended up using 135-203LAG-J01 A honeywell glass thermistor ...it is good for -60c to 300 c. It is 3900 ohms at 60c and 20k at 25c. It now runs and shuts off like it is supposed to. And it was an east fix with the soldering iron,. _________________ 1982 Westy, 1974 412 Variant... Yes, Aircooled's are great! Oh and I do have modern computer controlled vehicles too, but I just don't care about them. |
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raygreenwood Samba Member
Joined: November 24, 2008 Posts: 21474 Location: Oklahoma City
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Posted: Fri Jan 02, 2015 7:25 pm Post subject: |
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reluctantartist wrote: |
Well I fixed it and it works even better now. I think it was on its way out before. I ended up using 135-203LAG-J01 A honeywell glass thermistor ...it is good for -60c to 300 c. It is 3900 ohms at 60c and 20k at 25c. It now runs and shuts off like it is supposed to. And it was an east fix with the soldering iron,. |
Nice! I think we will all, be there sooner or later. Ray |
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