-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I finally picked up a multimeter with a K type thermocouple. Played with it last night roasting some Colombia, Kenya and the last of a bag of SM Classic Espresso Blend. What I noticed as I went through the three roasts was that as the beans expanded and lightened, they pushed the thermocouple up the roast chamber. For instance, the SM CEB was targeted for about 450. As I watched the roast and listened, I noticed that the temp was staying around 430, but audibly was much further along. I pushed the thermocouple down and had my target temp. Suggestions on placing/inserting the thermocouple on a poppery? Thanks, Jason - -- Jason Brooks jbrookshttp://javajeb.wordpress.com- ------------------------------- Enjoying good coffee in the Heart of Virginia -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla -http://enigmail.mozdev.orgiD8DBQFJX9LBvsJkiMz+UPsRAu/GAJ9FU6bf/5yvQov8lleasmMUMJcP8wCgot2h LfRj3zCdl0KFBLK8xOsJzlQ= =HyZR -----END PGP SIGNATURE----- Homeroast mailing list Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20
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Kevins recommendation works for me. The P1 has a 3" inside diameter so I placed my TC (the end of the probe) into the chamber center - - 1.5" from the sides and 1.5" up from the bottom. Some pics and other info is at:http://homeroasters.org/php/forum/viewthread.php?thread_id'0Mike (just plain) Homeroast mailing list Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20
I drilled a hole diagonally through the outer plastic housing, through the = Bakelite part of the chamber and poked the TC bead in so it is at Top Dead = Center when the popper is loaded with about 150g green beans. It is held in= place with masking tape. Not permanent, but I never have to remove it. As = the roast progresses and the beans expand, the bead becomes immersed in the= fluidized bean mass. Sometimes the wire moves if I stir the beans, but I j= ust poke it back into position. From: Kevin Creason To: homeroast Sent: Saturday, January 3, 2009 1:37:17 PM Subject: Re: [Homeroast] WBP1 Thermocouple Placement Drill a hole and permanently mount it. I did that with a couple of candy th= ermometers.
I got a length of very small diameter copper tubing from the hardware store. The TC just fits down through it, and the end of the TC just pokes out of the copper. Now I can hold the TC in place wherever I want it down through the top. Bend the tubing and hang it where you finally decide. If you want to use stainless steel... saw the shaft off of a turkey frier thermometer, (it is about a foot long and only a few bucks;) pulled the thermometer stuff out of it leaving a hollow SS tube. If you cut the tip of the pointed end off, you get quicker response time. Using this method, and moving the TC around during the roast, you get to see some major temperature variations within the bean mass. Placement is very important, as the air coming into the chamber is much hotter than the beans themselves. I saw up to 1000F. YMMV. PeterZ Still freezing in LHC. Andy Thomas wrote: <Snip> Homeroast mailing list Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20
If the thermocouple moves at all, the reading will always change- just like a coffee bean in a roaster or drum, and for the same reason. -ro On Sat, Jan 3, 2009 at 2:04 PM, Jason Brooks wrote: <Snip> -- "When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty Wichita (ex- NYC Paramount) WurliTzer- 1976 Homeroast mailing list Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20