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 Posted: May 18, 2012 - 07:29 PM |
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Joined: Apr 09, 2009
Posts: 44
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Hello,
I want to do a temperature measurement in the range about 150 to 250 °C.
Most temperature IC's are not useable above 150°C.
So who can provide some useful information what to do.
I hope there are some suggestions that I can buy in the local shop.
I't for use with an atmega 
No industry grade Pt100 or thermocouples please.
Thanks in advance! |
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Posted: May 18, 2012 - 07:49 PM |
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Joined: Feb 19, 2001
Posts: 25912
Location: Wisconsin USA
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Quote:
No industry grade Pt100 or thermocouples please.
But Pt1000 would be OK?
And does that mean "no thermocouples" period, or "no industry-grade thermocouples"?
Quote:
I hope there are some suggestions that I can buy in the local shop.
Wouldn't it then be a good idea to at least give us a hint of where in the World you are located?
Seriously, with all the restrictions give us something to work with.
-- Why the restrictions? Cost? What is the price range?
-- How critical is the app? If you are sensing internal boiler pressure for a safety device, that is much different than soldering iron tip temperature.
-- Speaking of soldering irons, there is a fairly extensive thread about how the tip is used as a thermocouple. http://www.avrfreaks.net/index.php?name ... torder=asc
-- Certain encapsulated thermistors are rated to that temperature.
-- Home cooking ovens appear to commonly use thermocouples. They seem to be readily available as replacement parts, and not too expensive. If on a severe budget, I'd think that one could salvage some from junk stoves/ovens.
-- Do you need to interface it to a microcontroller? Ready-made meat/barbeque thermometers are readily available.
-- $6.69 http://www.target.com/p/Taylor-TruTemp- ... %20digital |
Last edited by theusch on May 18, 2012 - 08:08 PM; edited 1 time in total
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Posted: May 18, 2012 - 08:03 PM |
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Joined: Apr 09, 2009
Posts: 44
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Pt can work, but it's quite hard to order.
The same for thermocouples.
With industry grade I meant: Not looking for high accuracy / a big packed "sensor rod",...
I live in Belgium, and I prefer to buy my supplies in the local shop, note that the parts are limited to the "most common" parts.
A soldering iron tip temperature is a good starting point to compare with. and my application doesn't require high accuracy.
Edit:
Thank you for some good ideas |
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Posted: May 18, 2012 - 08:57 PM |
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Joined: Sep 04, 2002
Posts: 21261
Location: Orlando Florida
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Posted: May 18, 2012 - 10:12 PM |
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Joined: Nov 11, 2003
Posts: 3886
Location: Chicago Illinois USA
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| I'm using a thermocouple for that range. Not hard to do but the solution is ruled out. |
_________________
Discursive design,
Torby
Some days, it's just not worth chewing through the restraints.
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Posted: May 19, 2012 - 06:51 AM |
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Joined: Jan 03, 2006
Posts: 4417
Location: Hemel Hemsptead, UK
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| Could consider a diode - -2mv/degreeC off the junction voltage. BVY59 (from memory; I'll check on Monday) is good for 200 C but I don't know about higher. Beware though that many diodes get somewhat leaky over 100 or 125C; you can't just pick at random. |
_________________
Neil Barnes
www.nailed-barnacle.co.uk
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Posted: May 19, 2012 - 09:15 AM |
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Joined: Jul 02, 2005
Posts: 5945
Location: Melbourne, Australia
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... remember you cannot expect to use a soldered diode in this temperature range more than once  |
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Ross McKenzie
ValuSoft
Melbourne Australia
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Posted: May 19, 2012 - 10:08 AM |
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Joined: Feb 06, 2009
Posts: 834
Location: TN
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| Infrared temperature measurement. |
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It all starts with a mental vision.
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Posted: May 19, 2012 - 02:43 PM |
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Joined: Feb 19, 2001
Posts: 25912
Location: Wisconsin USA
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Quote:
The same for thermocouples.
Quote:
I live in Belgium,
??? They have no kitchen ovens in Belgium?
Hard to order? None of the electronics supply or industrial supply distributors will deliver there?
I'm out. I realize that "engineering is making what you need out of what you have", but since I'm not MacGyver giving further recommendations not knowing what the stock is at the OP's corner convenience store is becoming onerous. (Hmmm--that said, they might well have a grilling thermometer.) |
Last edited by theusch on May 19, 2012 - 02:48 PM; edited 1 time in total
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Posted: May 19, 2012 - 02:47 PM |
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Joined: Jul 02, 2005
Posts: 5945
Location: Melbourne, Australia
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| Maybe their ovens only go to "chocolate melting" temperatures yumm. |
_________________
Ross McKenzie
ValuSoft
Melbourne Australia
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Posted: May 19, 2012 - 02:57 PM |
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Joined: Nov 01, 2005
Posts: 6324
Location: Hilversum - the Netherlands
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If you use a crimp contact for the diode, the melting solder problem is prevented. Do you plan to use it for a fluid cooled- or an air cooled Honda ?
I use a NTC in my motorbike to measure oil temp. Never seen it higher than 120 degr C. But hehe ... fluid cooled |
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Dragon broken ? Or problems with the Parallel Port Programmer ? Scroll down on my projects-page http://www.aplomb.nl/TechStuff/TechStuff.html for tips
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Posted: May 19, 2012 - 08:52 PM |
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Joined: Jan 03, 2006
Posts: 4417
Location: Hemel Hemsptead, UK
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We're using leadfree solder at 150-160C; the soldering irons need to be at 380C to get a clean join, and flux pens help no end.
We did use 60-40, but stopped using it after a component with a trace of bismuth on the leads simply fell off the boards... |
_________________
Neil Barnes
www.nailed-barnacle.co.uk
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