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Topic: equipment for gathering temp data (11 msgs / 293 lines)
1) From: Clifton
This is a multi-part message in MIME format.
 
What equipment are people using to gather temp data when they use a
themofilter on an espresso machines? We use mostly Fluke at work for our
handhelds. Its a 53 I think. When the data is transferred to the PC what
format is it in on your meter of choice? What is the interface? IR? or =
wired
serial? I am mostly familiar with 232 and 488 for data transfer at least
from the writing a program to transfer the data point of view. I use VB,
VC++ and LabWindows at work. I am on a quest to gather data on my =
Giotto. I
just ordered a thermofilter for my ECM.
 
So the question du jour is, "what is a good meter that has data logging =
to
use with a themofilter ?"
 
 
 
Clif - SomeWhere in Florida 
with Rocky the Cardi and Garfield the Tabby
Odie PWC at the Bridge 01/18/2006http://www.freewebs.com/aesk/inmemoriam.htm 

2) From: miKe mcKoffee
This is a multi-part message in MIME format.
Suggest doing some searching on HB forum since that's been discussed in some
detail there.http://home-barista.com/forums/ 
miKe  
From: homeroast-admin
[mailto:homeroast-admin] On Behalf Of Clifton
Sent: Saturday, September 16, 2006 5:29 AM
To: homeroast
Subject: +equipment for gathering temp data
What equipment are people using to gather temp data when they use a
themofilter on an espresso machines? We use mostly Fluke at work for our
handhelds. Its a 53 I think. When the data is transferred to the PC what
format is it in on your meter of choice? What is the interface? IR? or wired
serial? I am mostly familiar with 232 and 488 for data transfer at least
from the writing a program to transfer the data point of view. I use VB,
VC++ and LabWindows at work. I am on a quest to gather data on my Giotto. I
just ordered a thermofilter for my ECM.
 
So the question du jour is, "what is a good meter that has data logging to
use with a themofilter ?"
 
Clif - SomeWhere in Florida 
with Rocky the Cardi and Garfield the Tabby
Odie PWC at the Bridge 01/18/2006http://www.freewebs.com/aesk/inmemoriam.htm 

3) From: Paul Sack
Mike's advice is good. I'd suggest whatever you can find on E-Bay. I 
got a quite-nice Extech dual thermocouple logger for about $70, and it =
turns out the seller was a small coffee roaster who needed more 
channels. Fluke is more expensive and better built, but it is probably =
overkill for putting on your coffee bench.
(I haven't actually had a chance to use the logging feature just yet, 
but it connects to a serial port and proprietary windows software pulls =
off the bits.)
Cheers,
-Paul
On Sep 16, 2006, at 7:28 AM, Clifton wrote:
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and488 
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4) From: Mike Furlotti
My thermofilter showed up a few days ago and it has a T type  
thermocouple. I have a fluke 54 which is a fancy dual channel version  
of the fluke 51.  Make sure the instrument you get supports T, K, and  
probably J types.  Cheap thermocouple amplifiers only measure K  
thermocouples -- and converting the measurement into temperature will  
require some thought.
The color of the thermocouple connector, the wire color, or the  
letter printed on the connector will indicate the chemistry. Blue is  
the ansi color for T chemistry:http://www.omega.com/toc_asp/frameset.html?
book=Temperature&file_GEN_SPECS_REF
Here is a good source for the voltage-temperature relationships of  
thermocouples.http://srdata.nist.gov/its90/main/Mike
On Sep 16, 2006, at 9:39 PM, Paul Sack wrote:
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5) From: Michael Dhabolt
Don't forget that if you are geeky enough to have an extra PID laying
around, most of them can be set to read any 'Type' (K, J, T etc.) of
thermocouple and can be used as a TC thermometer.  Many have RS 485 or
other communication scheme built in and allow communication with your
PC in some fashion or other as a logger.
Mike (just plain)

6) From: Greg Scace
The fluke 53 is a good instrument with very good specs for not a 
whole lot of money, compared to things like an HP 3478A.  I use a 
Fluke when setting up machines.  If I need to log data and look at 
graphs I use a Picotech TC-08.  It's pretty inexpensive, as far as 
dataloggers go, but not the cheapest.  Advantage of the TC-08 over 
some of the cheaper loggers is that the thermocouples plug directly 
into the logger, compared to having to remove the plug and hard 
wiring into the logger.  Hard wiring tends to degrade accuracy if 
dissimilar metals are used at the connection point.  Temperature 
compensation on the TC-08 seems ok, but I haven't gotten too anal 
about it since good short term reproducibility is often enough.
-Greg
At 08:28 AM 9/16/2006, you wrote:
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7) From: Greg Scace
I should mention that John Bicht's post on AC brings up some salient 
points about accuracy in measurement, but his analysis and 
conclusions are incorrect.  I can expand on this if folks are interested.
-Greg
At 09:44 AM 9/16/2006, you wrote:
<Snip>

8) From: Greg Scace
This is good advice.  Thermofilters use type T thermocouples because 
the accuracy of type T is the best of the common thermocouple types 
at boiling water temps.  The wire used is "Special limits of error" 
wire, which has better accuracy than the ASTM spec for standard type 
T wire.  ASTM accuracy spec for the standard wire is +- 0.8C at 100C, 
which is 1.5 Deg. F.  It's important to keep in mind that regardless 
of the offset within the +- 1.5F range , the thermocouple will give 
the same answer to much better precision - on the order of tenths of 
a degree.  If the readout device is similarly stable over the short 
term, then comparative measurements may be made with differences 
accurate to a couple of tenths of a degree; more than sufficient.
-Greg
  At 12:40 PM 9/17/2006, you wrote:
<Snip>

9) From: Greg Scace
It's important to know how good the temperature compensation is 
executed within the controller, so that you get good answers.  Some 
controllers have pretty poor specs here.
At 03:46 PM 9/17/2006, you wrote:
<Snip>

10) From: David B. Westebbe
This is a multi-part message in MIME format.
I should mention that John Bicht's post on AC brings up some salient points
about accuracy in measurement, but his analysis and conclusions are
incorrect.  I can expand on this if folks are interested.
I am interested.  Please expand. 

11) From: raymanowen
Clif- we used direct connected Leeds and Northrup strip chart recorders wit=
h
either single or multi-channel, index switch selected type K thermocouples
at Colorado School of Mines Research Institute (CSMRI) for Oil Shale
research activity.
I've seen computer interfaces that obviate the chart ecorders and plot
temperature profiles in different colors on the computer screen or your
plotter. I'm trying to use some keywords to get some Gmail equipment ads.
Gmail always has ads targeted to the subject and keywords in the individual
emails, so this one has the following and more in the east border:
Sponsored Links
Thermocouples
Many styles and types in stock. Visit our webshop or call to order.
www.jumo.us
Thermocouples
The complete guide for information on Thermocouples.
www.commerce-database.com
TE Wire & Cable
Thermocouple Wire & Cable for all applicationswww.tewire.com
MCC temperature
measure
USB Temperature Measurement starting from $59www.measurementcomputing.com
Teflon Thermocouples
Thermocouples for chemical research Multiple styles, Teflon coated
www.jkem.com
Advanced Wire and
Cable
All Types- Military, Commercial Wire, Cable, Tubing, Sleeving.
www.advancedwire.com
Multi/Cable Corporation
Thermocouple Wire & Cable Experts Many cable constructions available
www.multicable.com
* more sponsored links
<?&ik=8aee97fd20&view=mlt&mk=9de01x8bd3vo9oreyhebvdt5eh17feb&mt==
0>
*
We used lots of Omega thermocouples, Instrument Service Co. locally, and I
made a number by just crimping the wires and /or TIG welding them. Welding
the small wires is a different experience from normal welding, which I leav=
e
to the pros.
I'm sending this back to myself, so I'll get some ads on the CPU interface,
welding and green Bolivian Coffee. That is fabulous coffee, just shy of 2nd
Crack. I did force a couple so I knew exactly the progress of the roast.
Cheers -RayO, aka Opa!
Now let's see what ads come up-
-- 
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Might=
y
Wichita (ex- NYC Paramount) WurliTzer- 1976


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