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Old 03-12-2009, 02:18 AM   #1
truckmann
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Default Cheap Thermocouple Thermometer

Here is what I recently got to replace all the cheap crappy digital thermometers I have been using. Found a good deal on it so I hope it lasts and works good. It look like the MTC that thermoworks is selling only it is a different color and has a different logo on it. The initial tests look good it's right on at freezing but it was only reading 209-210 in boiling water. Not sure what to think of that. It was very consistent in the boiling water unlike the taylor digital that was supposed to be water resistant. Obviously it isn't even close since I can see moisture fog up the inside of the display and as soon as it gets too much moisture in it, it starts giving all kinds of bad readings.

Details are I found it on ebay under JMS Type K thermocouple, but I bought it directly from the seller NOT using ebay. The guy was very nice, answered my questions and got it to me very quickly. I paid $30.50 shipped with a wire thermocouple that will need some modification to be useful in liquids. I also found a good deal on a 12" type K probe from ebay for $10 shipped. So my total cost in it is $40.50 with the probe.

Anyway here are pictures of my initial tests.

With wire thermocouple


With Probe


In Ice

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Old 03-12-2009, 02:25 AM   #2
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Mash Temp range (this is an interesting one)


Boiling



Video showing how quick it reacts...~4 seconds from freezing to boiling.

[IMG]

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Old 03-12-2009, 02:35 AM   #3
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I likey!
Are we going to split hairs at +/- 1 degree?
Cheers!
-David

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Old 03-12-2009, 03:19 AM   #4
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No splitting hairs for me as long as it stays consistent.
I am just so sick of digitals that read right one day and off 10 degrees the next so I hope this is the answer without spending a bunch of $$$

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Old 03-12-2009, 04:00 AM   #5
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Can you use that probe in a weldless fitting in a MLT just like you can a regular probe thermo? How sturdy is it? I'd hate to damage it with my mash paddle. It also looks very long. How long is it? Or is this just a sanity check device for digital thermos?

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Old 03-12-2009, 04:11 AM   #6
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Originally Posted by Lil' Sparky View Post
Can you use that probe in a weldless fitting in a MLT just like you can a regular probe thermo? How sturdy is it? I'd hate to damage it with my mash paddle. It also looks very long. How long is it? Or is this just a sanity check device for digital thermos?
The probe I got is 12 inches long and it is a little flimsy. Not ideal but it was only $10 brand new. The place I got it from is an overstock/discontinued item liquidator. I looked it up on the place it originally came from and they sold it for a lot more, but that particular one was discontinued. I might buy a piece of larger stainless tubing to reinforce it. I'm still just poking the probe in on top the mash for my temps.

You can get any type K probe with a mini connector an it will work with the thermometer so I'm sure you can find one or have one made how you want it. I plan on using this little guy as a primary thermometer along with my fermentap bi-metal just to have a secondary check when brewing. It's really annoying when you think you are mashing in at 154 and find out it was probably only 148 due to a crappy thermo. I need to check the calibration on the dial thermo in my HLT too.
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Old 03-12-2009, 01:31 PM   #7
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ProbeConfig

Here looks to be a decent place to configure a thermocouple probe and the ones I have done the prices appear to be reasonable for a good quality brand.
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Old 03-12-2009, 01:51 PM   #8
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Your location is about 700 feet above sea level. Water boils at 210 in your area.

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Old 03-12-2009, 03:18 PM   #9
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Your location is about 700 feet above sea level. Water boils at 210 in your area.
That's what I was thinking. The calculator that I used was telling me around 211 using the barometric pressure reading at the Airport which is a good 30 minute drive away. So depending on the actual Baro pressure at my location at the time that little thermometer is probably right on.
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Old 03-12-2009, 05:21 PM   #10
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I think you will find that RTD's and Thermocouples are very accurate but they are not necessarily fast.

I just viewed your video... you should give a thermocouple at least 30 seconds before taking note of the temp. In fact, you should apply that to all digital thermometers.

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