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Best budget method of temp. logging
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Whitcoatsyndrom
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Posted Tue Apr 15, 2014, 1:56pm
Subject: Best budget method of temp. logging
 

I threaded a thermocouple into the bean mass on my bread machine heat gun setup so I'm no longer roasting blindly...such a simple and eye-opening addition.  

Can someone give advice on the least costly way to log my temps so I can put them into a graph form (not writing down temps every 10 seconds then manually inputing them).  There are many thermocouple thermometers out there with such capability, some of which are more costly than others (I'm trying to keep this in the $30 range).  This seems to be the most effective option for me right now http://www.uni-trend.com/UT321.html selling on fea-bay for $55.  Any better suggestions with an even small price tag (I understand that this is already on the low end).  Links to other threads that I couldn't find are, of course, appreciated.
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JKalpin
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Posted Wed Apr 16, 2014, 9:53am
Subject: Re: Best budget method of temp. logging
 

I have an identical unit sold by TENMA, their model number is 72-7712.

If you read the manual (on your reference page) you will see that you can set it to data-log manually or automatically.  The file it creates can be downloaded to an Excel spreadsheet (and therefore graphed).

What I particularly like about that unit is the ability to do 'offset correction'.  Type K thermocouples can have inaccuracies.  If you want better accuracy at (say) 350F you can heat up some cooking oil and, with an accurate cooking thermometer, adjust out the thermocouple error.  

I have been using thermocouples from Procon Products (eBay store).  They are a Canadian company, I think, but they ship from China.  Their thermocouples (particularly the SS sheathed ones) are industrial quality and low-cost.

 
Jerry
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Whitcoatsyndrom
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Whitcoatsyndrom
Joined: 25 Apr 2013
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Location: Roanoke, VA
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Posted Wed Apr 16, 2014, 2:02pm
Subject: Re: Best budget method of temp. logging
 

Thanks for the info, the TENMA looks just like the UNI-T (as you said it would). I'm having trouble finding the TENMA for sale but it appears that the uni-t is cheaper anyway.
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dana_leighton
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Posted Wed Apr 16, 2014, 7:10pm
Subject: Re: Best budget method of temp. logging
 

Whitcoatsyndrom Said:

Thanks for the info, the TENMA looks just like the UNI-T (as you said it would). I'm having trouble finding the TENMA for sale but it appears that the uni-t is cheaper anyway.

Posted April 16, 2014 link

I got a similar unit (the 7715) on sale at MCM Electronics for $50. It's at $99 now: http://www.mcmelectronics.com/product/TENMA-72-7715-/72-7715

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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Whitcoatsyndrom
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Whitcoatsyndrom
Joined: 25 Apr 2013
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Location: Roanoke, VA
Expertise: I live coffee

Espresso: Expobar Office Pulser
Grinder: Baratza Vario
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Roaster: HG/BM
Posted Thu Apr 17, 2014, 7:55am
Subject: Re: Best budget method of temp. logging
 

dana_leighton Said:

I got a similar unit (the 7715) on sale at MCM Electronics for $50. It's at $99 now: http://www.mcmelectronics.com/product/TENMA-72-7715-/72-7715

Posted April 16, 2014 link

That's also good advice, although I wish it was still on sale.  I think I may end up going with a Victor 86C digital multimeter, as it looks like they can be had for under $50.  They also have a USB port allowing for connection to a computer for real-time data collection.  The Roastlogger program also supports it.  Anyone have any experience with it?
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