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Thermocouple mod for FreshRoast SR-500
phunge
I wanted to share my thermocouple mod for my FreshRoast SR-500. I've read of people using fiberglass insulated TCs, but being a bit paranoid about food safety I decided to go for a stainless-steel sheathed probe from Omega.

Why I'm paranoid: the documentation on Omega's fiberglass TCs (http://www.omega...._guide.pdf) mentions a binder coating which "improves moisture and abrasion resistance but is destroyed above 400deg F", I don't want stuff like that near my coffee. The fiberglass probe I got with my cheap TC reader didn't have any documentation.

I found the 12" probe to work really well, I bent it so that it'd snake through the chaff collector down into the roasting chamber. It's secured to the chaff collector with a little aluminum foil. The hole through the chaff collector was filed with a woodworking rasp (I've heard the FreshRoast's plastic can be brittle so I didn't want to drill).

If I had to do it again, I might try a larger diameter probe (1/8" instead of 1/16"). The 1/16" was really easy to work with though, and the movement of the beans doesn't seem to disturb it.

Feedback welcome! It was a fun little project and works great so far.

Part numbers:
Omega #KTSS-116U-12
1/16" diameter, 12" length 304 stainless steel type K probe with lead
Omega #SMPW-K-M
male mini connector, type K
phunge attached the following image:
dscf5036.jpg
 
phunge
Mounted in chaff collector.
phunge attached the following image:
dscf5057.jpg
 
phunge
Probe position
phunge attached the following image:
dscf5064.jpg
 
JETROASTER
I don't have this roaster, but that's a tidy little posting. Thanks for sharing! -Scott
 
JimG
Nice approach with the 1/16" sheathed probe!

Jim
 
www.pidkits.com
seedlings
I get really excited whenever I see a 'new to me' item. Great probe and install!

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
dshepard
Looks good! I am using the thermocouple that came with the meter Sweet Maria sells. If it fails this looks like the way to go.
 
phunge
Thanks everybody!

@dshepard I'm using that same thermocouple meter! It's $17 at http://www.web-tr...wkpro.html, found thanks to a suggestion on this forum.

Does anyone have any suggestions for better ways to affix the probe to the plastic chaff collector? I'm using aluminum foil which works well and is easy to modify. But I was wondering if this might cause galvanic corrosion (http://en.wikiped..._corrosion) due to the contact of stainless steel & aluminum -- I'll definitely keep a lookout for it. I can't think of anything else that'd withstand the heat.
 
JETROASTER
Try some stainless safety wire. (Aviation supply)
http://www.skygee...in-co.html

Have some fun and order the pliars too!
-Scott
JETROASTER attached the following image:
791.jpg

Edited by JETROASTER on 01/29/2011 2:34 AM
 
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phunge
Sweet, that's exactly what I need. I'll give that a try, thanks!
 
dshepard
phunge wrote:
Thanks everybody!

@dshepard I'm using that same thermocouple meter! It's $17 at http://www.web-tr...wkpro.html, found thanks to a suggestion on this forum.

Does anyone have any suggestions for better ways to affix the probe to the plastic chaff collector? I'm using aluminum foil which works well and is easy to modify. But I was wondering if this might cause galvanic corrosion (http://en.wikiped..._corrosion) due to the contact of stainless steel & aluminum -- I'll definitely keep a lookout for it. I can't think of anything else that'd withstand the heat.


Well my original sensor failed so I purchased the above recommended thermocouple and took your advice and bought the 1/8" probe. Instead of bending the probe like you did I went ahead and drilled a 1/8" hole in the top of the roaster and just push it straight down. I use a clothes pin to hold it in place (adjustable mod!! :) ).

When I first started using it the temperatures seemed low, so I double checked it by putting the probe in boiling water and it read exactly 212 degrees, right on. That meant that either I am using a different position in the roasting chamber or the previous sensor read high. It was hard to place the original sensor anyway as it was just a flexible piece of wire with the thermocouple at the very end.

I like this rigid probe much better than the flexible sensor that came with the meter. Ironically I paid much more for the probe than I did for the meter and sensor combined originally.
 
NickelCreek
Okay I'm confused (happens quite often actually) I have an SR500 Freshroast and am new to this roasting thing. Am I to understand that you first used a flexible digital sensor which burnt out and then switched to a rigid sensor ? Do you have a link as to where I might purchase one?
Thanks
 
allenb
NickelCreek wrote:
Okay I'm confused (happens quite often actually) I have an SR500 Freshroast and am new to this roasting thing. Am I to understand that you first used a flexible digital sensor which burnt out and then switched to a rigid sensor ? Do you have a link as to where I might purchase one?
Thanks


Not sure about the flexible thermocouple sensor failing but here's a link to Omega and the sheathed sensor mentioned at the top.

http://www.omega..../JTIN.html

I'm guessing the 1/16" dia sheath will respond a little faster than the 1/8" due to less thermal mass.

Allen
Edited by allenb on 05/15/2011 5:05 AM
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
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