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'[OT]: Measuring temperature...'
2003\07\19@013651 by Picdude

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Any of you folks have a way to measure temperature semi-accurately w/o expensive thermometers?  Within a few degrees would be nice, and in the range of 0 to 300 deg F.  I'm trying to test the calibration of a temp sensor for my car.

I can use ice and hot water to get the 32- and 212-deg F points.  But is there a way to get 1 or 2 points between that, and a couple other points up to about 300 deg F?  Is there any other liquid I could boil that has some known boiling point perhaps?

Cheers,
-Neil.

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2003\07\19@025458 by Wouter van Ooijen

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> Any of you folks have a way to measure temperature
> semi-accurately w/o
> expensive thermometers?

What's wrong with digital temperature sensors? TC77 is accurate to one
degree out of the box. LM75, DS1820 etc to within afew degrees (don't
confuse accuracy and resolution!).

Wouter van Ooijen

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2003\07\19@032318 by Bob Axtell

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Best way is to get / buy / borrow a Fluke Thermocouple attachment for Fluke
DVM. They are 0.5C accurate.

--Bob

At 12:37 AM 7/19/2003 -0500, you wrote:
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2003\07\19@032932 by Picdude

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Hey Wouter,

These don't go to 300 deg F (149 deg C) though, so I still need a way to test near that upper point.  I have a one of these laying around here that's good for ~1 deg C accuracy and only up to 100 deg C, IIRC.  Can't remember the number, but I should go check.  I could probably find something at Digikey, perhaps a bit expensive, and wait on it in the mail, but would be nice if there were some known points so I could finish this over this weekend.

Cheers,
-Neil.


On Saturday 19 July 2003 01:53, Wouter van Ooijen scribbled:
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2003\07\19@034436 by Picdude

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Wasn't aware that any thermocouple meter would be that accurate.  Buy is a problem right now (I've seen the prices of these things in the past).  Borrow may be a possibility .... entering head-scratching mode now...

Cheers,
-Neil.



On Saturday 19 July 2003 02:22, Bob Axtell scribbled:
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2003\07\19@034641 by Rob Hamerling

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Picdude wrote:
> Any of you folks have a way to measure temperature semi-accurately w/o
> expensive thermometers?  Within a few degrees would be nice, and in the range
> of 0 to 300 deg F.  I'm trying to test the calibration of a temp sensor for
> my car.

Recently I had good results with the LM74 (National Semi), -50 to +150
deg. C, resolution 1/16 of a degree). See also at my homepage:
http://www.robh/nl/picsoft.htm#thermo

Regards, Rob.

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2003\07\19@035500 by Rob Hamerling

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Rob Hamerling wrote:

> Recently I had good results with the LM74 (National Semi), -50 to +150
> deg. C, resolution 1/16 of a degree). See also at my homepage:
> http://www.robh/nl/picsoft.htm#thermo

Sorry, should have been: http://www.robh.nl/picsoft.htm#thermo
Rob.

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2003\07\19@040141 by Wouter van Ooijen

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> Recently I had good results with the LM74 (National Semi), -50 to +150
> deg. C, resolution 1/16 of a degree). See also at my homepage:
> http://www.robh/nl/picsoft.htm#thermo

Almost the same as uChip's TC77, but
- TC77 has slightly better accuracy (1 versus 1.25, but that maight be
due to the range over which this is spec'd)
- LM74 has higher range (up to 150 C intead of 125)

Wouter van Ooijen

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2003\07\19@042712 by Picdude

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Ooohhh, I like.  If only I could get it here tomorrow.  Oh but wait, it's 3am, meaning it's already tomorrow.  So I just need to get it here today.

Question -- can I just dunk an SOIC (on a small PCB fragment) into hot oil?  Sure, it is designed for it, but it just seems so odd.

Cheers,
-Neil.



On Saturday 19 July 2003 02:45, Rob Hamerling scribbled:
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2003\07\19@042728 by Picdude

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For a couple bucks a piece, there's no reason I can't use different ones at different temps.

Cheers,
-Neil.



On Saturday 19 July 2003 03:01, Wouter van Ooijen scribbled:
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2003\07\19@112922 by Patrick B. Murphy
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Neil,

One point you can consistently achieve is your body temperature - and
a good thermometer should be able to confirm it - if you are
willing/able to put the sensor under your tongue or under your arm.

You might want a basal (sp?) thermometer for higher accuracy.

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Best regards,
Patrick Murphy


Saturday, July 19, 2003, 12:37:53 AM, you wrote:

P> Any of you folks have a way to measure temperature semi-accurately w/o
P> expensive thermometers?  Within a few degrees would be nice, and in the range
P> of 0 to 300 deg F.  I'm trying to test the calibration of a temp sensor for
P> my car.

P> I can use ice and hot water to get the 32- and 212-deg F points.  But is there
P> a way to get 1 or 2 points between that, and a couple other points up to
P> about 300 deg F?  Is there any other liquid I could boil that has some known
P> boiling point perhaps?

P> Cheers,
P> -Neil.

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2003\07\19@141749 by Andrew Kieran

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For an easy solution, us a LM34cz temperature sensor ($5.00) and
connect it to 5 volts.  Then connect the output pin to a digital
multimeter.  The voltage is proportial to the temperature and
calibrated at the factory for 10mv/degree F.
So:

0.00V = 0 degrees F
0.01V = 1 F
0.10V = 10 F
0.75V = 75 F
1.00V = 100 F
3.00v = 300 F (The top rated temperature).

That's it.  You don't need any other components unless you want
to measure negative temperatures in which case you need to shift
the ground reference with a couple of diodes and a resistor (as
outined in the spec sheet).

Cheers,
Andrew


From: "Picdude" <EraseMEpicdudespamNARWANI.ORG>
To: <RemoveMEPICLISTEraseMEspamEraseMEMITVMA.MIT.EDU>
Sent: Saturday, July 19, 2003 1:37 AM
Subject: [OT]: Measuring temperature...


Any of you folks have a way to measure temperature
semi-accurately w/o
expensive thermometers?  Within a few degrees would be nice, and
in the
range
of 0 to 300 deg F.  I'm trying to test the calibration of a temp
sensor for
my car.

I can use ice and hot water to get the 32- and 212-deg F points.
But is
there
a way to get 1 or 2 points between that, and a couple other
points up to
about 300 deg F?  Is there any other liquid I could boil that
has some known
boiling point perhaps?

Cheers,
-Neil.

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Get your own "800" number
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2003\07\19@154646 by Picdude

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On Saturday 19 July 2003 10:14, Patrick B. Murphy scribbled:
> Neil,
>
> One point you can consistently achieve is your body temperature - and
> a good thermometer should be able to confirm it - if you are
> willing/able to put the sensor under your tongue or under your arm.
>
> You might want a basal (sp?) thermometer for higher accuracy.

Hee hee hee!  Only time I'll get to 300 deg F is when I spontaneously combust.  And then it won't matter to me anyway.  :-)

Cheers,
-Neil.

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2003\07\19@155057 by Picdude

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Well looks like you ended up with almost the same part as I did.  Digging thru all the junk I have here, I just found an LM35DT.  TO-220 package.  Whereas digikey lists it as 0.8 deg C accuracy and up to 100 deg C, the datasheet tells me it's actually good to 150 deg C.  That 302 deg F, which is just what I need.  Bingo!

And lowest temp I really need is ambient.

Thanks,
-Neil.

On Saturday 19 July 2003 13:16, Andrew Kieran scribbled:
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2003\07\20@181724 by Peter L. Peres

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Imho buy a laboratory glass thermometer. It will cover -50 to +150 degrees
C it is *very* reliable (unless you break it) and accurate to +/- 1 degree
(which is +/-0.5% for that span). It will serve you well for many years if
you take care of it. I spent $20 on mine and never looked back. For an
accurate calibration point, a digital human temperature thermometer is
very good as others have pointed out.

Boiling liquids and stirring slush will only get you within +/- 2 degrees
or so and there will be plenty of error sources. I have tried this in
several ways (including using standard laboratory practice cf. manuals)
and it is not easy. The glass thermometer is the way to go imho.

Peter

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2003\07\21@001546 by Lawrence Lile

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Assuming it is clean, your mouth is a handy 98.6 F.  I use this a lot
(actually fingers ) just to test if a thermocouple is live.  Since I live
around a calibrated lab with in-house calibration facilities I don't
really use this for anything but "is this thing on?"

You *can* measure a thermocouple with a good multimeter.  However, the
millivolt level signals will not be easy to measure against noise with any
accuracy , and you'll need a complicated chart as hard to read as a "Find
Waldo" cartoon to interpret it.

The other post about a $20 lab thermometer is a better idea though.  Do
not get any thermometer you can buy at a hardware store, they are junk.
Oven thermometers, might as well wave a dead chicken over it you'll get
closer results.


-- Lawrence Lile
Senior Project Engineer
Toastmaster, Inc.
Division of Salton, Inc.
573-446-5661 voice
573-446-5676 fax




Picdude <KILLspampicdudespamBeGonespamNARWANI.ORG>
Sent by: pic microcontroller discussion list <EraseMEPICLISTspamEraseMEMITVMA.MIT.EDU>
07/19/2003 12:37 AM
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       Subject:        [OT]: Measuring temperature...


Any of you folks have a way to measure temperature semi-accurately w/o
expensive thermometers?  Within a few degrees would be nice, and in the
range
of 0 to 300 deg F.  I'm trying to test the calibration of a temp sensor
for
my car.

I can use ice and hot water to get the 32- and 212-deg F points.  But is
there
a way to get 1 or 2 points between that, and a couple other points up to
about 300 deg F?  Is there any other liquid I could boil that has some
known
boiling point perhaps?

Cheers,
-Neil.

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2003\07\21@203414 by Barry Gershenfeld

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Now if I said I wanted to measure 0-12 volts with a PIC, you
would all know what do, right?   You all know how to make a
voltage divider, so how about a temperature divider?  Place
one end of a metal bar against the engine, and at the other
end you have a cup of boiling water (or melting ice, your
choice).  Place the temp sensor at the appropriate fractional
point along the bar to get the appropriate scaling factor.

Too long to wait until April.

- Rube

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2003\07\22@004035 by Mike Singer

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There was a thread
"Re: [EE]: Temperature Sensors? How'bout lamps?"

Mike.

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