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'[PIC] Temperature measurment thermistor vs thermoc'
2008\02\01@130645 by Phillip Coiner

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Hi all

I need to measure temperature of a chemical reaction that I'm told can reach
as high as 400F (204C)

I have done something similar before in a couple of designs using
thermistors with a voltage across them and an AD converter to read the
voltage change with temp.

This was only to tell me if the temp gets higher than 150C to report an
error/failure so it wasn't the most accurate temperature measurement ever
made of that I'm certain.

It worked fine but I only learned enough/remember enough to get into trouble
now.

This time I need a fairly quick response time and I need to have less than
one degree of error across the range i.e. 0 to 204C.   (Lets say 0 to 250C
for the sake of discussion)



I know nothing about selecting a thermistor verses a thermocouple but I was
told that for temps above 150C that I might need to use a thermocouple.

Can any of the resident wise men direct me to some resources to read or
offer any advice for selecting a thermistor vs a thermocouple?

I'm going to go to the microchip web site later today and grep around for
any application notes?

I be grateful for any advice or direction anyone here has to offer.

Thanks in advance.



Best Regards,



Phillip Coiner, Chief Technology Officer

GPS Source, Inc.

64 N. Mission Drive


Pueblo West, Co 81007

Phone: 719.510.4552

E-mail: spam_OUTpcoinerTakeThisOuTspamgpssource.com



cid:.....image001.jpgKILLspamspam@spam@01C76FB5.FC0AD300

Your source for quality GNSS Networking Solutions and Design Services






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2008\02\01@132352 by Marc Nicholas

picon face
You're correct in that you're getting out of the "sweet spot" for
thermistors, although there are units that'll do what you want.

I would use an RTD...a PT-100 would be ideal and I use them regularly
with a resolution of 0.1c and better than 1c accuracy.

Regards,

-marc

On Feb 1, 2008 1:06 PM, Phillip Coiner <pcoinerspamKILLspamgpssource.com> wrote:
{Quote hidden}

> -

2008\02\01@135722 by Phillip Coiner

picon face
Hi marc
Mucho mucho thanks
Who is the manufacturer of that device?


Best Regards,

Phillip Coiner, Chief Technology Officer
GPS Source, Inc.
64 N. Mission Drive

Pueblo West, Co 81007
Phone: 719.510.4552
E-mail: pcoinerspamspam_OUTgpssource.com

cid:@spam@image001.jpgKILLspamspam01C76FB5.FC0AD300
Your source for quality GNSS Networking Solutions and Design Services


{Original Message removed}

2008\02\01@140052 by Phillip Coiner

picon face
Hi marc
I just found this
iqinstruments.za.net/iqshop/technical/pt100.html
I haven't had time to absorb it all but it is very interesting /
informative.
Best Regards,

Phillip Coiner, Chief Technology Officer
GPS Source, Inc.
64 N. Mission Drive

Pueblo West, Co 81007
Phone: 719.510.4552
E-mail: KILLspampcoinerKILLspamspamgpssource.com

cid:RemoveMEimage001.jpgTakeThisOuTspam01C76FB5.FC0AD300
Your source for quality GNSS Networking Solutions and Design Services



{Original Message removed}

2008\02\01@142343 by Mark Scoville

flavicon
face
> Can any of the resident wise men direct me to some resources to read or
> offer any advice for selecting a thermistor vs a thermocouple?
>
> I'm going to go to the microchip web site later today and grep around for
> any application notes?
>
> I be grateful for any advice or direction anyone here has to offer.
>
> Thanks in advance.


Phillip, the Maxim MAX6675 *may* be something for you to look at. It is a
K-Thermocouple to SPI chip. We use it to measure between 600C and 900C - I
can't remember if it goes down to zero. I don't remember the accuracy
either - might not be good enough for you. Maxim does have a reputation for
availability issues - we haven't had any problems with this part... yet.

-- Mark



2008\02\03@034101 by Vasile Surducan

face picon face
On 2/1/08, Phillip Coiner <spamBeGonepcoinerspamBeGonespamgpssource.com> wrote:
{Quote hidden}

There are some good solid state RTDs (looking like a diode and acting
like a RTD).
But for 1C accuracy over 200C will need calibration.
Search for KTY84 (but there are also too from Siemens, Infineon, NXp etc).

Vasile

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