[s-cars] Interior temp sensor source

[Mark Strangways]

Yeah there are a few "curves"..
I believe that would be a type J curve. Not to be confused with a type J 
thermocouple.

With out pulling my cover off, I can't really measure anything.

Mark S
----- Original Message ----- 
From: "Kevin Day" <kday at ultrameta.org>
To: <s-car-list at audifans.com>
Sent: Saturday, November 13, 2004 11:24 AM
Subject: Re: [s-cars] Interior temp sensor source


> Room temp. here is definitely closer to 22C than 15C.  However, it's my
> understanding that thermistor curves are not standardized the way e.g.
> thermocouple curves are.  But for this application it may be moot.
>
> Here's an interesting page describing how one can determine a very
> close approximation to the curve using three data points:
> http://www.betatherm.com/stein.htm
>
> In practice though, I'd probably just buy Digi-Key p/n KC004E-ND and
> give it a try.  It looks to have nearly identical physical dimensions
> and is a 3K NTC.
>
> -Kevin
>
> On Sat, Nov 13, 2004 at 11:05:50AM -0500, Mark Strangways wrote:
>> There are 2 different sensors listed, one is a 3k NTC, which would show
>> Kevin's room to be 22 C.
>> The other is a 2.25K NTC which would show his room as about 15 C
>>
>> So I think it is save to say it's a 3k NTC
>>
>> Mark
>> ----- Original Message ----- 
>> From: "Mark Strangways" <Strangconst at rogers.com>
>> To: "Kevin Day" <kday at ultrameta.org>; <s-car-list at audifans.com>
>> Sent: Saturday, November 13, 2004 10:48 AM
>> Subject: Re: [s-cars] Interior temp sensor source
>>
>>
>> >Kevin try to get a reading of the resistance at 25 Celsius.
>> >Mark S
>> >----- Original Message ----- 
>> >From: "Kevin Day" <kday at ultrameta.org>
>> >To: <s-car-list at audifans.com>
>> >Sent: Saturday, November 13, 2004 10:10 AM
>> >Subject: Re: [s-cars] Interior temp sensor source
>> >
>> >
>> >>At least on my '94, there is what is clearly a thermistor
>> >>mounted behind the little grille in the sunroof control panel.
>> >>
>> >>Tony, since I happen to have a sunroof control panel sitting on my desk
>> >>here, FYI it is a NTC (negative temperature coefficient) thermistor, 
>> >>and
>> >>measures approximately 3500 ohms at room temperature.  You very likely
>> >>could replace this with a standard thermistor costing pennies, once the
>> >>thermistor parameters are known.  If you want to go this route I can 
>> >>dig
>> >>up a thermometer and measure a few points on the resistance vs.
>> >>temperature curve for you.
>> >>
>> >>I think the microphone is in the A-pillar, but haven't yet needed to
>> >>take that part of the car apart...
>> >>
>> >>-Kevin
>> >>
>> >>On Sat, Nov 13, 2004 at 12:02:35AM -0700, Bob DG wrote:
>> >>>Isn't that the microphone for the hands free phone? I thought the temp
>> >>>sensor was in the dash somewhere?
>> >>>
>> >>>>From: "Tony" <tony.curran at sympatico.ca>
>> >>>>To: <S-CAR-List at audifans.com>
>> >>>>Subject: [s-cars] Interior temp sensor source
>> >>>>Date: Fri, 12 Nov 2004 18:30:08 -0800
>> >>>>
>> >>>>Guys,
>> >>>>
>> >>>>Looking for a source for the interior temp sensor in the sunroof
>> >>>>control
>> >>>>panel. Local dealer has them for cdn$80. Are there any suppliers out
>> >>>>there
>> >>>>that carry them.
>> >>>>
>> >>>>TIA
>> >>>>
>> >>>>Tony
>> >>>>_______________________________________________
>> >>>>S-CAR-List mailing list
>> >>>>S-CAR-List at audifans.com
>> >>>>http://www.audifans.com/mailman/listinfo/s-car-list
>> >>>
>> >>>
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>> >
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>>
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