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K Type Thermocouple

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AndrewQLD

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HI
I am looking for a k type thermocouple (i think) :p I have just purchased a BTC-9090 controller and I need to get a temp probe to go to my HLT, can anyone point me in the right direction and if possible give me any tips in setup/usage. (I am technically impaired)

Regards
Andrew
 

Fammer

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You can get them from Jaycar & Dick Smith etc for around $10 but the length of wire is pretty short, I am sourcing some 'special' extension wire to make them longer.

I currently have a few controllers just got to get a 24v power pack and then I will be looking to buy around 4 Thermocouples.

Possible AHB group buy?
 

vlbaby

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The 'special' extension wire you're referring to Fammer, can be used as the sensor itself if you want to save a buck. Just twist the pair of wires together, solder them if you wish, then at that point it becomes your temperature sensor.

vlbaby.

IMG_0058.JPG
 

Fammer

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ahh vlbaby - good man!

Friend has some offcut supposed to be coming when he gets back from where ever he is.

Is it accurate though? I know thermocouples are not that accurate and usually a few degrees out - does this make it worse.
 

Gout

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i was told they tig weld the ends together in the "real" ones, so i assume twist may also sorta work... however i think the voltage given (as per temp) is due to different metals hence the K type P type N type etc and the solder may (or may not) effect this??!?! (another metal)

I do not know enough to say what to do, just as i am having a home brew after work, i thought i would through this somewhat usless information in....

sorry and back to drinking :)
 

vlbaby

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It's exactly the same accuracy as any other probe as long as you use the correct type lead ( Compensation lead ) , you'll be fine.
You're right about the accuracy, thermocouples can be a bit touch and go with accuracy. In my experience +/- 1 deg is common. But this shouldnt present too much hassle as most temperature devices can be fine tuned to read correct values.
I use one of these setups on my brew fridge, and it serves the purpose ok. Much better than a thermostat i can tell you.

vlbaby.
 

vlbaby

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you could be right about the solder bit gout. I havent soldered mine, but i have done it before for installation i have done at work. I dont' remember having any problems, but if you were unsure, it is easy enough to do a comparison between soldered and just twisted.

vlbaby.
 

als_world

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I have just purchased a BTC-9090 controller
Ah, so you're the one that won the auction (I should have know from the eBay bidder ID :blink: )

As other posters have said, you can make your own K-type (as oppsed to K-tel :p ) thermocouples from Chromel and Alumel wires/strips, but it's generally easier to buy the off-the-shelf ones.

Have a look here -> http://www.isi-seal.com/searchs/doc/ThermocoupleIntro.htm for descriptions of the various thermocouple types/materials.

The BTC-9090 can use most of the common types of thermocouples, but you'll need to program it to take the right one. You'll want to start here -> http://www.brainchild.com.tw/bc/index-product_c_9090.html and read the PDF manual. You'll also want to check the part number to see what options it has for inputs, outputs etc. It's a good unit and you've done well on the price, but you may need to set aside a bit of time to configure it correctly.

Cheers,

Alan
 

ausdb

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vlbaby said:
The 'special' extension wire you're referring to Fammer, can be used as the sensor itself if you want to save a buck. Just twist the pair of wires together, solder them if you wish, then at that point it becomes your temperature sensor.
[post="58592"][/post]​
Gout said:
i was told they tig weld the ends together in the "real" ones, so i assume twist may also sorta work...
[post="58604"][/post]​
Gouts correct on this one, a welded joint will give a better reading than just twisted or soldered wires

I have fixed thermoucouples before using a car battery and bit of the carbon rod from an old D cell battery using a method described at the bottom the following page.
http://yarchive.net/electr/thermocouples.html

HTH

Ausdb
 

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