HomeRoast Digest


Topic: TC data logger (36 msgs / 676 lines)
1) From: Alchemist John
I am looking for recommendations for a datalogger for some TC 
data.  Multiple inputs would be nice.  Some ilk of flash memory would 
be good (the logger part maybe) so it doesn't have to be computer 
connected at the time of recording.
Any experience or suggestions?
John Nanci
AlChemist at large
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2) From: Bob Hazen
John,
Omega has been around for a long time.  There are others like Agilent or 
Fluke; it depends on how much you want to spend.
Take a look at:  "http://www.omega.com/ppt/pptsc.asp?ref309A&Nav=tems08"Bob
<Snip>
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3) From: John Mac
Wow!
That's cool, just what the man asked for.
I love this place.
On 12/29/08, Bob Hazen  wrote:
<Snip>
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4) From: Eddie Dove
Thank you to both of you.
I was going to ask the same question and specify USB connectivity for
my laptop; the laptop has no serial ports.  I had been looking all
over the place for this yesterday and could only find them with serial
ports.
Again, thank you.
Eddie
-- 
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Home Coffee Roasting Blog and Referencehttp://southcoastcoffeeroaster.blogspot.com/On Mon, Dec 29, 2008 at 11:13 PM, Bob Hazen  wrote:
<Snip>
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5) From: Edward Bourgeois
I've been considering one of these. They have models of 2 and 4 ports.
I've been using Greenlee printer loggershttp://www.valuetesters.com/UEI-DT302-Apollo-2-Digital-Temperature-Logger.phpEd
On Tue, Dec 30, 2008 at 12:52 AM, Eddie Dove
 wrote:
<Snip>
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6) From: Kevin Creason
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7) From: Joseph Robertson
John,
I especially like this one.http://www.omega.com/ppt/pptsc.asp?ref806&Nav=teml04I don't think it would be that hard to hack up a flashcard enabled
version of one of these units.
I'm thinking of replacing my sick bean probe in my probat with this
one. New technology is so cool.
JoeR
On Mon, Dec 29, 2008 at 8:51 PM, Alchemist John
 wrote:
<Snip>
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8) From: Michael Dhabolt
John,
<Snip>
Fluke makes a couple of great units - price is commensurate with
quality (read: they are really proud of em).
Extech model 421509 is a TC dual input logger with a somewhat less
impressive feature set, and a considerably less impressive price.
Comes with an RS232 serial interface, I use a USB to Serial converter
and/or a tablet with a serial port.  Supplied software is dated, but
functional (Fluke software is good, not included and expensive).  I've
found the Extech to satisfy all my needs (other than my lust for
'Best' quality, that I usually allow to control my tool purchases).
The Extech has enough flexibility to meet my needs, somewhat more
cumbersome to use than the Fluke in some unusual configurations (which
I can't even remember right now).
I've had this for a while, I'd definitely see if they had a newer,
niftier, up-graded model before buying.
Mike (just plain)
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9) From: Michael Dhabolt
John,
BTW, at one time one of the Omega units was a re-branded model of the
Extech.  With different body work, a couple fewer features and a
little more expensive, I believe. I mention this because my experience
with dependability from Omega stuff has been top notch and if they
bought in, it's OK by me.
Mike (just plain)
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10) From: Michael Dhabolt
John,
Another BTW.
A good discussion about these units is at:http://www.home-barista.com/espresso-machines/fluke-vs-omega-dataloggers-for-use-with-scace-thermofilter-t1857.htmlMike (just plain)
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11) From: Dean
Hi John,
These guys used to make (stopped selling it about a year ago) a TC to 
USB 4ch interface:http://www.aprsworld.com/The price was pretty good, the specs were about what you might expect 
for a TC.
Now they say they are working on a datalogger as a replacement--they 
just don't say how diligently (as in no release date)
If you're not in a hurry this might be something to keep an eye on.....
Dean
Alchemist John wrote:
<Snip>
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12) From: Edward Bourgeois
I'd like to add a question to Johns question. Anyone know about data
logging the voltage adjustments of a variac along with the temp.
readings?
thanks,
Ed
-- 
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13) From: Alchemist John
Thanks all.  The Omega looks good.  I will check out the discussion.
At 12:42 AM 12/30/2008, you wrote:
<Snip>
John Nanci
AlChemist at large
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14) From: Greg Scace
PIcotech TC-08  is an 8-channel usb connectivity datalogger with 8 
inputs that can each accept all common thermocouple types.  Good 
accuracy and relatively cheap, as far as dataloggers go.  Dumps into 
your pc pretty painlessly and has max reading rate of 1 reading per second.
US source is Swangate International in VA Beach, VA.
-Greg
At 11:51 PM 12/29/2008, you wrote:
<Snip>
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15) From: Tom & Maria - Sweet Maria's Coffee
I have used a 2 input extech for years, and I am sure there are new 
models that are cheaper and include some additional memory. But the 
extech has been very reliable, so as a brand, i recommend them...
tom
<Snip>
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            Sweet Maria's Home Coffee Roasting  -  Tom & Maria
                      http://www.sweetmarias.com                Thompson Owen george_at_sweetmarias.com
     Sweet Maria's Coffee - 1115 21st Street, Oakland, CA 94607 - USA
             phone/fax: 888 876 5917 - tom_at_sweetmarias.com
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16) From: Ben Lowery
I keep hoping for a simple 1or 2 input device that just talks USB or  
serial at a fair price, but I still have not seen anything suitable.  
There's the 8 input picotech one, but I really want something with  
less inputs (and hopefully a lower price).
Anyone know of anything like that? After the Xmas season, selling the  
family on another $150 device seems sketchy.
For now I'm hand entering temps into excel every 30 seconds. Gets the  
job done, but it's a bit much to juggle.
On Dec 30, 2008, at 4:15 PM, Tom & Maria - Sweet Maria's Coffee  wrote:
<Snip>
<Snip>
<Snip>
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17) From: Bob Hazen
You might want to poke around the websites that have been mentioned so far. 
If you want one instrument that can be configured for thermocouples (10's of 
uV) and line voltage (100's of volts) you will paying for the flexibility. 
Here's an example from Omega:
"http://www.omega.com/ppt/pptsc.asp?ref-DAQPRO-5300&Nav=dase01"Bob
<Snip>
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18) From: Bob Hazen
Well never mind....   It only goes to 10V.  I should have read more closely.
Bob

19) From: Ira
At 02:49 PM 12/30/2008, you wrote:
<Snip>
If it would measure to 10VAC instead of only 10VDC it wouldn't be 
that hard to drop the 117 into the 10V range.
Ira
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20) From: Bob Hazen
Good point, Ira.
If one wanted to fool around a bit, the line voltage could be rectified and 
divided down to the 10Vdc range.  It would probably be wise to use a 
transformer to step down the voltage and make sure the channel to channel 
isolation voltage limit on the meter isn't exceeded.  Assuming the meter 
averages DC input voltages, judicious selection of the dividing resistors 
and/or turns ratio would allow calculation of the RMS line voltage from the 
scaled down average, rectified DC value.  Probably more than most people 
want to tackle - and the thing is still $1000.
By spending even more, a data acq from Agilent would do the trick.  We use 
them at work to collect data for environmental tests.  These can handle 
thermocouples, current transformers, ac voltages, dc voltages...just about 
anything you can think of.  But just one 10-channel switch module is around 
$1000.  Then you have to buy the rest of the system.
Bob
<Snip>
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21) From: Edward Bourgeois
hmmm, just about all this voltage measurement talk flew way over my
head. But I did understand the mention of $1000.! I will settle with
logging BT and MET temp. readings and just record my Kill-A-Watt
readings with pen and paper.
thanks,
Ed
On Tue, Dec 30, 2008 at 6:42 PM, Bob Hazen  wrote:
<Snip>
-- 
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22) From: Ira
At 03:54 PM 12/30/2008, you wrote:
<Snip>
But given your setup would monitoring voltage even matter?  Not that 
I can see unless you're using an off the shelf roaster that you're 
not talking about.
All that voltage does is change the maximum available heat and unless 
your elements are on 100% of the time because the voltage is low, the 
voltage should not matter.
I use a Behmor and I commonly see 111 to 113 when the elements and 
afterburner are on and that seems to be plenty.  Plenty, as I'm not 
sure that upping it to 119 would make much difference in the roasts I 
get from my machine as I can still see the elements cycle on and off 
all during the roast
Ira
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23) From: Edward Bourgeois
I use my variac to directly adjust my heating element during the
roast(no thermostat) and generally range from 118v down to 95v. It's
nice to have a record of level changes/time
On Tue, Dec 30, 2008 at 7:50 PM, Ira  wrote:
<Snip>
-- 
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24) From: Ira
At 05:58 PM 12/30/2008, you wrote:
<Snip>
I understand, you're not wanting to log line voltage, you want 
element voltage.
Ira
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25) From: Edward Bourgeois
Yup element voltage. I actually have a speed indicator on my variable
speed bean bats. Variable speed convection fan, lower conduction plate
heater on variac, upper convection element on variac, BT tc and MET
tc.,timer. Allows me to do a roast up to 95% convection or conduction
or any mix of. A lot to monitor, adjust and log at the same time.
On Tue, Dec 30, 2008 at 10:07 PM, Ira  wrote:
<Snip>
-- 
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26) From: raymanowen
How tough is it to convert 10VAC to 10VDC? Want to read rms or p-p? We have
ways... ro
On Tue, Dec 30, 2008 at 4:17 PM, Ira  wrote:
<Snip>
-- 
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Wichita (ex- NYC Paramount) WurliTzer- 1976
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27) From: Michael Dhabolt
I use an SCR for voltage control of the heater element, and data
logging it would be useful.  If someone does come up with a method,
please post it.
Mike (just plain)
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28) From: raymanowen
Some measuring methods could give inaccurate indication, with SCR or Triac
power control- indicate almost the same with a 50% power variation.
Since the power- and temperature- varies exponentially with the voltage on
the heater, why not measure a linear measurand, like the temperature- That's
the main interest, isn't it?
Cheers, Mabuhay and Magandang Umaga -RayO, aka Opa!
On Wed, Dec 31, 2008 at 12:18 AM, Michael Dhabolt 

29) From: Michael Dhabolt
Ray,
raymanowen wrote:
<Snip>
Your right.  Getting a bit anal (as well as curmudgeonly).
Mike (just plain)
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30) From: Ira
At 10:45 PM 12/30/2008, you wrote:
<Snip>
He want's power, so I'd guess RMS or power if you can do that.  Not 
to many analog engineers left. My dad could have done it, but he's 
been gone for years. I can do digital stuff, but anything past simple 
analog and my mind turns to much.
Ira
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31) From: Edward Bourgeois
I use the Bean temp and environmental temp.(thermocouple just above
bean mass where the air flow first hits the mass) to monitor the roast
but I started to log my element voltage cause I found that not all
beans absorb heat equally(no surprise). so it was nice to have a
record of how much more or less I should be ready on the accelerator
when repeating a roast.The more experienced I get the less important
this becomes but has come in handy when you get one of those as I've
heard Tom refer to "why? dunno" beans
Ed
On Wed, Dec 31, 2008 at 3:00 AM,   wrote:
<Snip>
-- 
Ed Bourgeois aka farmroast
Amherst MA.http://www.aginclassroom.org/Homeroast mailing list">http://coffee-roasting.blogspot.com/ Co-President- Ma. Agriculture in the Classroomhttp://www.aginclassroom.org/Homeroast mailing list
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32) From: Edward Bourgeois
My Kill-A-Watt meter off the variac is measuring and displaying my
elements voltage data, just would like to get that data directly into
the pc along with the 2 tc.
On Wed, Dec 31, 2008 at 12:49 PM, Ira  wrote:
<Snip>
-- 
Ed Bourgeois aka farmroast
Amherst MA.http://www.aginclassroom.org/Homeroast mailing list">http://coffee-roasting.blogspot.com/ Co-President- Ma. Agriculture in the Classroomhttp://www.aginclassroom.org/Homeroast mailing list
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33) From: Joseph Robertson
Do you mean "turns to much" mush or it spins round and round?
:)
JoeR
On Wed, Dec 31, 2008 at 9:49 AM, Ira  wrote:
<Snip>
-- 
Ambassador for Specialty Coffee and palate reform.
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34) From: Ira
At 11:11 AM 12/31/2008, you wrote:
<Snip>
Now isn't that an interesting mistake. I'd guess that at different 
times, both are accurate.
Ira
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35) From: Barry Luterman
depends was it to or too
On Wed, Dec 31, 2008 at 10:42 AM, Ira  wrote:
<Snip>
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36) From: John Grubbs
Ben, here are a couple of links to a 1-input device that might do what you
want. Of course, you won't see current temps as you roast (unless maybe temp
can be displayed real time on a computer).http://www.omega.com/pptst/OM-EL-USB-TC.htmlhttp://www.microdaq.com/lascar/usb_thermocouple_logger.php
On Tue, Dec 30, 2008 at 3:48 PM, Ben Lowery  wrote:
<Snip>
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