Seeking low tech way to measure brew temperature - Page 2

Beginner and pro baristas share tips and tricks.
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networkcrasher

#11: Post by networkcrasher »

So I'm looking for a Type K thermocouple for over-the-lip measurements on my Fluke 287 with my thermocouple adapter. It accepts the blade style connector for a thermocouple.

Anyone have a good place to pick one up?

JimG

#12: Post by JimG » replying to networkcrasher »

Nice meter. Curious to hear how it works for this.

One option is to buy a spool of 30AWG type K thermocouple wire from http://www.omega.com for $21. Their part number is TT-K-30-25. You'll also need a mini-connector (Omega part number SMPW-K-M) or two. Pretty simple to make an over-the-lip probe by twisting a short length of stripped wires together to form a sensing tip.

Alternatively, I've been known to make up a probe or two with my t/c welder in exchange for a charitable contribution of your choosing :)

PM me if interested.

Jim

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erics
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#13: Post by erics »

Well, I have been possibly underbid :)

At least I could possibly sell you the Type K connectors I never use.
Skål,

Eric S.
http://users.rcn.com/erics/
E-mail: erics at rcn dot com

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networkcrasher

#14: Post by networkcrasher »

JimG wrote:Nice meter. Curious to hear how it works for this.

One option is to buy a spool of 30AWG type K thermocouple wire from http://www.omega.com for $21. Their part number is TT-K-30-25. You'll also need a mini-connector (Omega part number SMPW-K-M) or two. Pretty simple to make an over-the-lip probe by twisting a short length of stripped wires together to form a sensing tip.

Alternatively, I've been known to make up a probe or two with my t/c welder in exchange for a charitable contribution of your choosing :)

PM me if interested.

Jim
Thanks! I was able to pick it up for a song, and my previous 89 was getting a bit long in the tooth. Still works just fine, but the 287 does logging, and I thought it would be a good opportunity to get a new meter, a logger, and a temp probe all in one. I'm hoping it works well for this, but if it doesn't, I still have a nice meter on my hands for all of my other projects.

As far as creating my own t/c, are there any parameters one needs to abide to as it relates to stripped wire length, twisting length, etc? I suppose I just didn't realize one could make their own t/c so easily - at least K types anyway.

Checked out a t/c welder on Omega. Pretty interesting. 1800 bucks though? Geeeez! That's a LOT of t/c's before an ROI!


erics wrote:Well, I have been possibly underbid :)

At least I could possibly sell you the Type K connectors I never use.
I'll be contacting you shortly, Eric. I figured you'd find your way into this thread, but didn't want to just ask you directly. :) I'm sure you have other things on your plate!

JimG

#15: Post by JimG »

I have the 189 model, and I really love it. Too bad it has been discontinued. The 189 measures temperatures well, so I'm guessing your's will, too. For very critical measurements, I think a digital thermometer is always going to do a slightly better job because of cold junction issues.

Look for posts by Jim Schulman on building thermocouple sensors. As I recall, he advises to strip around 1/4", wrap the two wires tightly together, and then fold over the wrapped pair.

Omega is very proud of their t/c welders 8) A respectable DIY unit can be built, however, using a 24VDC PSU, a bank of BMF capacitors, a pure carbon rod, and some small pliers.

Jim

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networkcrasher

#16: Post by networkcrasher »

JimG wrote:I have the 189 model, and I really love it. Too bad it has been discontinued. The 189 measures temperatures well, so I'm guessing your's will, too.
Err, thanks Jim. I think I mistyped and meant 87. I know it doesn't do temp, which was a good reason for me to go to the 287 for its temp and logging capabilities.

I'll check out Jim's posts. Thanks for the tips! Eric is going to help me out with some t/c's for my GS3, so I should be up and running later next week. I know the GS3 has been brow beaten quite a bit wrt temp, but I'd like to have a look see for myself.
-Mark

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cafeIKE

#17: Post by cafeIKE »

If you are going to use an over the lip sensor, be sure you either don't have insulation inside the basket or that you have a drip cutout in the insulation before the meter connector. The drip cutout must be the lowest point in the wire. 10bar is ample pressure to force coffee down the wire inside the insulation. If the meter is vertical, coffee will run into your meter. :cry:

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networkcrasher

#18: Post by networkcrasher »

Good tip Ian, thanks! I assume even the 30g wire has this issue?

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cafeIKE

#19: Post by cafeIKE »

I don't know that all wire has this issue. I do know that some 24g K and 36g T do.
Wanna experiment on your meter? :wink:

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networkcrasher

#20: Post by networkcrasher »

Haha, considering my meter, not so much. Considering my curiosity, maybe. :twisted: