topbanner.gif
Login
Username

Password




Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Shoutbox
You must login to post a message.

JackH
01/04/2019 10:55 AM
2 years today...Miss you Ginny!

JETROASTER
01/04/2019 4:24 AM
A little shout for the G'ster. 2 yrs. roar

allenb
12/27/2018 5:14 AM
Hi Brandon, please disregard the "please update". I think we're all up to speed now. The need for cache clearing get's me every time! limb

NetriX
12/26/2018 11:36 AM
Update? pouring Merry Christmas back atcha

allenb
12/26/2018 3:07 AM
Merry Christmas Brandon. Please update soon! christmas tree

Users Online
Guests Online: 4

Members Online: 0

Total Members: 5,766
Newest Member: cimbalino
In Memory Of Ginny
Donations

Latest Donations
PRABHATH COFFEE WORKS - 10.00
John Despres (Scene... - 25.00
snwcmpr - 10.00
Ozo - 20.00
Josh Woodrow - 10.00

View Thread

Who is here? 1 guest(s)
 Print Thread
TC4 temperatures in Artisan artificially high with back to back roasts
Graeme Lindsay
Hi everyone,

This a a recent problem as I didn’t used to get this problem.

I’m using an air roaster, the TC4 and Artisan on a Mac.


With the first roast of the day, the bean thermocouple readings are what I expect with regards to Dry, First crack temperature and drop temperatures.


However, further back to back roasts result in the first crack temperature and drop temperature becoming progressively higher.

After 3-4 roasts the first crack temperature has risen by 8-9 degrees Celsius and a similar rise in drop temperature.


I have now placed an identical thermocouple next to the thermocouple that is wired up to the TC4. The extra thermocouple has been connected to a standalone Hylec thermometer and gives the expected dry, normal FC and drop temperatures.


So, it appears that with repeated roasts, the thermocouple connected via the TC4 to Artisan is progressively showing higher and higher temperatures.


Thoughts on what might be going on?


Many thanks.

Graeme
 
renatoa
Any chance to have increasing air temperature in the electronics box ? This would move the cold junction reference further and further...

Also, did you tried to cycle power between roasts ?
DIY: TO based IR to bean 800g
Moded commercial: Dieckmann RoestMeister, Nesco, popcorn.
PID/ramp/soak controllers, MS6514 USB/Artisan/Apps/popC/ESP32
Grinder: mod'ed Porlex to 47 conical burrs
 
Graeme Lindsay
Thanks Renatoa,

No I don't think it is a problem with the electronics box overheating.

Not quite sure what you mean by cycle, but it's an air roaster and the temperature drops very rapidly once the roast finishes. Also, I'm trying unplugging the USB from the computer to turn the TC4 after each roast but that doesn't seem to make a difference so far.

I have seen somewhere about how to setup Artisan to show the TC4 internal temperature. I'll try to do this to see if it is actually the onboard internal TC4 temperature that is actually rising and affecting the cold junction temp.
 
renatoa
Yep, the unplug USB part is what I meant, to reset TC4.
 
Will2
This would be a photo of a tc4 placement on the device and a photo of a thermocouple connection.
In 99% of cases is the reason that why Renatoa writes.
There is little likelihood of error in a thermocouple or TC4.
Viliam
 
greencardigan
You could also try adding a short jumper wire across any unused thermocouple inputs. I think I had issues once with charge building up over time on open connections? I think it was Jim who suggested I jumper the unused connections.
 
Jump to Forum:

Similar Threads

Thread Forum Replies Last Post
Using TC4C with Artisan Dataloggers/Controllers/Rate of Rise Meters 13 01/06/2019 2:59 PM
5+lb Gas Fluid Bed Roaster TC4-> Artisan Issue Building a Coffee Roaster 4 12/30/2018 9:06 PM
Thanks Brad, Jim, and Artisan Team Dataloggers/Controllers/Rate of Rise Meters 7 10/25/2018 12:22 AM
Artisan and Mastech 6514 Dataloggers/Controllers/Rate of Rise Meters 8 10/24/2018 9:26 PM
Back to the Garden... Roasting Coffee 3 10/24/2018 1:49 PM
Homeroasters Association Logo, and all Content, Images, and Icons © 2005-2016 Homeroasters Association - Logos are the property of their respective owners.
Powered by PHP-Fusion Copyright © 2019 PHP-Fusion Inc
Released as free software without warranties under GNU Affero GPL v3
Designed with by NetriX