#1  
Old 05-08-2010, 12:57 AM
Serf
 
Join Date: Jan 2009
Location: UK
Posts: 11
Default Thermometer

Okay, I have been planning this damn oven for some time now, the Spring is here and I am ready to start...
I would really love to have a nice big thermometer showing the dome temperature at a glance, kinda like the ones you get on a weber bbq (but BIGGER).
Where on earth can I find something like this in the UK. Has anyone else done this I have searched the forum but not found anything.

I will take some photos soon so you can all follow the build.

Also if there is anyone in East Sussex Kent area that needs to buy fire bricks, we could chip in together to get the price right down.

Cheers

Ryan
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  #2  
Old 05-09-2010, 03:18 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Thermometer

Most barbecue thermometers only go up to 600 F. These can be useful mounted in the door for slow cooking. For measuring the higher temperatures most go with a hand held infrared thermometer, or a thermocouple system.
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  #3  
Old 05-09-2010, 08:19 PM
Laborer
 
Join Date: Apr 2010
Location: Burna, KY
Posts: 54
Default Re: Thermometer

I bought thermocouple wire online and built my own. I've got four thermocouples and a meter with only 70$ invested. They work great by the way.
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  #4  
Old 05-15-2010, 01:16 PM
lwalper's Avatar
Laborer
 
Join Date: Dec 2009
Location: Tennessee
Posts: 73
Default Re: Thermometer

How did you make your thermocouple? I've got the appropriate 22ga wire with SS braid jacket. Do you just twist the ends together or what?? And, which wire is the (+) positive — the one with the stripe or plain? When I plug the bare wires into my meter with the stripe in the (+) side I get a reading that is approximately what I have on a thermometer sitting on my desk. With the stripe wire in the (-) side it seems like the temp reads 4-5 degrees less. I guess the stripe wire is (+) positive?
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  #5  
Old 05-15-2010, 08:53 PM
eprante's Avatar
Journeyman
 
Join Date: May 2009
Location: El Cajon CA
Posts: 282
Default Re: Thermometer

James has a nice thermometer for sale with a big dial and 3m cable for the remote probe. It is a little pricey at $200, but is a nice piece. I have mine mounted inside the oven 4" above the floor. The thing about temperatures is that it is different depending on where you are measuring it. When my thermometer reads 700, the dome is 800- 1000 depending on how vigorous the fire is. So for cooking you need to get a feel for the oven, depending on how long it has been fired, how big your current fire is etc.
The thermometer mounted in the oven does give me a reference, then I use the IR for measuring the floor temp. I have linked some photos of my install
Good Luck,
Eric
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Thermometer-img00106.jpg   Thermometer-img00198.jpg  
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  #6  
Old 05-16-2010, 10:32 AM
Banned
 
Join Date: Feb 2010
Location: Bend, Oregon
Posts: 131
Default Re: Thermometer

look on line you should be able to find a cheaper one if this is the way you want to go
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  #7  
Old 05-16-2010, 05:28 PM
Apprentice
 
Join Date: Oct 2009
Location: Minnesota
Posts: 106
Default Re: Thermometer

My build is using a dual thermocouple (one floor, one dome) and dual pyrometer system. The instruments are Diesel pyrometers from VDO, and they are backlit and sexy. Basically they are the instruments you might find in a Mercedes-powered boat, and are simple to read and range from about 200 to 1650 degrees, and one should be able to distinguinsh 50 degree increments. Summit Racing has them. You will need to get a transformer to step down household voltage to 12VDC.
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  #8  
Old 05-16-2010, 08:30 PM
Laborer
 
Join Date: Apr 2010
Location: Burna, KY
Posts: 54
Default Re: Thermometer

Quote:
Originally Posted by lwalper View Post
How did you make your thermocouple? I've got the appropriate 22ga wire with SS braid jacket. Do you just twist the ends together or what?? And, which wire is the (+) positive the one with the stripe or plain? When I plug the bare wires into my meter with the stripe in the (+) side I get a reading that is approximately what I have on a thermometer sitting on my desk. With the stripe wire in the (-) side it seems like the temp reads 4-5 degrees less. I guess the stripe wire is (+) positive?
I used a resistance spot welder to fuse my thermocouple wire together just because I had easy access to one. My second choice would have been silver solder. I think the melting point of silver solder is sufficient for temperatures reached in a WFO but I would double check before you use it. As for which wire is + and which is -, a magnet will stick to the negative wire and not to the positive.

oven thread: http://www.fornobravo.com/forum/f21/...cky-12829.html (42" Pompeii in Kentucky)
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  #9  
Old 05-17-2010, 02:39 PM
Apprentice
 
Join Date: Oct 2009
Location: Minnesota
Posts: 106
Default Re: Thermometer

Each pyrometer comes with a little Inconel shielded thermocouple with a braided leader, which you can then set into desired locations. They are threaded, as they are really meant to screw in really hot Diesel exhaust systems, but I just took the washer off and set them in strategic holes in the cupola.
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  #10  
Old 05-17-2010, 02:44 PM
Apprentice
 
Join Date: Oct 2009
Location: Minnesota
Posts: 106
Default Re: Thermometer

Also I figure the sensing tip of the thermocouple should go be placed as far to the exterior wall of the thermal mass as possible, and beneath the insulation. That way the temperature readings are more likely to represent the "true" temp of the dome rather than the temperature of the air/ combustion gas inside the cupola. When an external pyrometer reaches 700F, then you know the brick mass beneath it is at least that hot.
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