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Topic: IR thermometer, was +Temperature Probe (3 msgs / 81 lines)
1) From: Brian Kamnetz
On Jan 2, 2008 9:54 PM, ray  wrote:
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Ken Mary posted a bit on this a week or two ago. After a bit of
off-list discussion with Ken, I bought an IR Thermometer from Harbor
Freight, on sale at the store for $30 (original price $60). I haven't
used it for roasting yet.
I have had it only a couple days. Tentative results indicate that this
unit seems to not like the cold. At home, where I keep the temp around
62 degrees, the IR thermometer reads 4-6 degrees cold in the house,
compared to readings of other thermometers. Here at work, where temp
is usually around 74, the IR thermometer is within a degree or two of
other thermometers.
Again, I have had the IR thermometer only since the 31st, so these
observations are very preliminary and there is lots to find out about
it yet.
Brian

2) From: Ken Mary
IR thermometers are useful in controlled conditions. The user should learn
the basic operation and limitations. Even though the readout may not be the
actual temperature, it can give benchmark temperatures for roast control.
IMO, IR units read closer to the actual bean temperature than thermocouples
when used with hot air roasters.
Brian:
Check the battery. You may want to replace it with a new alkaline battery.
Most of the batteries in new electronic equipment are cheap non-alkaline.
I have just checked my IR unit in warm and cool temperatures. The floor of a
partly enclosed doorway reads 50F with the IR unit just removed from 65F
storage. After leaving the unit in the 50F location for 15 minutes, the
readout temperature was the same 50F. And the same 50F another 20 minutes
later. However, a warm 67F floor read 64F with the cold IR unit. After only
5 minutes in a warm room, the unit was reading the original 67F. There are
readout errors when moving the IR unit between hotter and colder
environments, unless adequate time is allowed for the unit to reach the new
ambient temperature.
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3) From: Brian Kamnetz
Ken,
Good tip on the battery. I will check that out.
I am a bit mystified about the readings in my house. The thermostat
thermometer says 64, but I can't find anything in my house that reads
above 60. I have an extra thermometer at work that I will take home
for the weekend and do some checking. At work that thermometer and the
IR Thermometer read very close to the same.
I am enjoying playing with the IR thermometer. For $30 it is a great
toy. Once I get the readings figured out it will be very interesting
to play with it with my heat gun/dog bowl roasts. I try to follow a
profile attributed to Jim Schulman, which I have tried to blend with
Tom's general roasting guide, all of which means I am keying on
color/time, and of course first crack when that occurs. It will be fun
to have more accurate data.
Brian
On Jan 4, 2008 8:51 AM, Ken Mary  wrote:
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