HomeRoast Digest


Topic: infrared thermometer? (10 msgs / 201 lines)
1) From: Edward Spiegel
Has anyone used an infrared/laser thermometer? I saw one at the electronics store the other day -- it cost more than I am willing to pay for a thermometer ($69 I think) but it seems like it might be just the thing for getting an accurate temperature reading of bean temp when using a hot air popper.
Here is a link to a similar device:http://www.surftilyoudrop.com/thermometer.htmIt seems like there would be almost no latency.
Thoughts?

2) From: Craig Wichner
I just bought one, and researched the field before I did. There are three
main types:
1) The least expensive are the tiny, hand-held models that can be had for
about $40 (not a recommendation for the vendor, but here's a linkhttp://store.yahoo.com/comfort/larselfoampa.html)2) The mid-range are the IR + laser (for targeting). This is the type of
device you linked to. The standard seems to be the Raytek MT4, which can be
had for $62 (down from $99 list) athttp://store.yahoo.com/bradystools/thergunminte1.html 
3) The third is the IR + laser + connector for a thermocouple probe.  The
Thermocouple allows you to calibrate internal temperatures with what you see
from the IR. For example, I use an I-Roast, and this combo allows me to IR
the glass roasting chamber, and also see the temp of the exhaust air. (The
IR will pick up the heat of the glass roasting chamber, not the beans
inside, and due to the mass of the glass with change more slowly than the
air). These seem to range from under $100 to $160 to $$$$
The specific model I bought also has a "lock" button, which allows
continuous (hands-free) scanning, and also can be attached to a tripod, all
perfect for what I wanted. It is $79 (plus tax plus $3.95 ground shipping,
which in my case delivered the next day):http://www.metrisinst.com/product_details.php?ID8&sm_chart=0There are also "ray-gun" type models, but they seem to be more expensive,
don't have the lock function and I don't think stand on their own (but they
do look more cool that the Zytemp model I bought).
With the targeting laser, these things are a little too fun and very likely
to cause severe geekitis.   Oh, it also might help with roasting...but that
would just be a bonus.
Craig Wichner
(Roasting and lurking for a few months now, and very much appreciating all
that this community is sharing)

3) From: Dave Ehrenkranz
I was just reading the "Java junkies do it at home" article and  
noticed a reference to an infrared thermometer ($99). Where can one  
get one, do they work well?
dave

4) From: Aaron
Not sure if SM's sells the IR thermometers or not but you can find them 
on E bay, electronic parts and supply stores, places like grainger, 
harbor freight and the likes or any AC/R supply house.
99 is mid level, there are cheaper ones, there are better ones, but 
given you don't 'need' tenth of a degree accuracy nor do you need to 
read temps to 1500 degrees, might opt for one of the less expensive 
ones, even if it's accuracy is within 2 degrees, thats still plenty good 
nuff for our needs.
aaron

5) From: Steve Hay
I've heard with these you have to be somewhat careful about what temperature
you are actually reading.  Not sure if they "see" through glass or not,
which means you'd be getting glass temp on an iRoast or SC/TO..  Still I've
thought it might be really cool to measure bean temperature with IR and
compare it to air temperature with a TC...
On 11/26/06, Dave Ehrenkranz  wrote:
<Snip>
-- 
Steven Hay
hay.steve -AT- gmail.com
Barry Paradox: Consider k to be the greatest element of the set of natural
numbers whose description require maximum of 50 words: "(k+1) is a natural
number which requires more than 50 words to describe it."

6) From: scott miller
Maybe it's just me, but IR seems a bit overboard for typical home
roasting... now, "over the top" home roasting ....
cheers,
Scott --> like Martin says: Beans + Heat ....
On 11/26/06, Steve Hay  wrote:
<Snip>

7) From: Aaron
IR will NOT see through glass, thats one of it's disadvantages.  Also 
while many of them will have a laser pointing / aiming devise, the 
actual "window" it reads is an inch or so...s so no you are not  going 
to get a 'bean temp' per se but the temp of several beans in that area 
the dot is pointing.
aaron

8) From: mikeraz
Aaron wrote:
<Snip>
Not that getting the temp of several beans together is a bad thing.
What I noticed when I looked at the IR thermometers is that they expressed the
read beam as a ratio. For the thermometers I looked at these were 6:1 and 8:1.  
This means you are looking at a one inch area when you hold the probe
six or eight inches from the target.  One needs to be careful to hold
the probe the proper distance from the beans to read the area one intends.
-- 
      Michael Rasmussen, Portland Oregon  
    Be appropriate && Follow your curiosityhttp://fut.patch.com/">http://www.patch.com/words/orhttp://fut.patch.com/
  The fortune cookie says:
You plan things that you do not even attempt because of your extreme caution.

9) From: William Fairchild
A friend of mine had one and I tried reading into the iRoast bean mass
and it seemed to stop at the glass roasting chamber. It wasn't getting
anywhere close to the temp. on the thermocouple in the roast chamber.
On 11/26/06, scott miller  wrote:
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10) From: Dave Ehrenkranz
Guess I will just have to get up the courage to actually modify my  
iRoast2 to get a thermocouple into the roasting chamber. It will wait  
until next year as we are leave for China in 12 days.
dave
On Nov 27, 2006, at 9:44 AM, William Fairchild wrote:
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