Stove top vs pipe temperatures

LAndrim · Feb 2, 2011

I've read all the threads on the Condar probe thermometer and the wacky readings (thanks to all the great work the "experimenters" did; truly wonderful of you guys!).

However, as a newbie, I'm more confused than ever. I'm getting very LOW readings on my Condar on a double wall pipe 18" above the stove. Just bought a Rutland today and put it on my stove top and it's reading hotter than the probe!! Almost by 200 degrees! Here are my questions:

1. Positioning. For the Rutland, since I DO NOT HAVE SINGLE pipe, i need to put it on the stove not the piping ( I have a Lennox Canyon ST310). Where is best placement? Side? Center of ledge? Closer to pipe ledge?
2. Accuracy. Who do I believe, Rutland stove top temps or Condar double pipe temps?

As a newbie, I've very afraid of over or underfiring, and I'm not adept enough to "read the flames" yet.

Thanks in advance for all your wisdom!

remkel · Feb 2, 2011

Jamison said:
I've read all the threads on the Condar probe thermometer and the wacky readings (thanks to all the great work the "experimenters" did; truly wonderful of you guys!).

However, as a newbie, I'm more confused than ever. I'm getting very LOW readings on my Condar on a double wall pipe 18" above the stove. Just bought a Rutland today and put it on my stove top and it's reading hotter than the probe!! Almost by 200 degrees! Here are my questions:

1. Positioning. For the Rutland, since I DO NOT HAVE SINGLE pipe, i need to put it on the stove not the piping ( I have a Lennox Canyon ST310). Where is best placement? Side? Center of ledge? Closer to pipe ledge?
2. Accuracy. Who do I believe, Rutland stove top temps or Condar double pipe temps?

As a newbie, I've very afraid of over or underfiring, and I'm not adept enough to "read the flames" yet.

Thanks in advance for all your wisdom!

I could be wrong, but placing a magnetic thermometer on a double wall pipe will not give you a good reading for flue temps.

LAndrim · Feb 3, 2011

Just to clarify: the Condar probe is inside the double wall pipe,and giving me lower readings than the Rutland which I have on the stove top. Just curious as to best positioning of the Rutland and which reading do I believe?

Battenkiller · Feb 3, 2011

You should be getting two different readings most of the time. The probe measures the gas temp inside the pipe, the stove thermo measures the surface temp of the metal outside the stove. I would go with the probe temp. It should read between 600Âº and 900Âº depending on the stage of the burn (lower temps later in the burn). I wouldn't worry about overfire in your case, if you are getting a real low probe temp (below 500Âº), you are not running your stove hot enough.

begreen · Feb 3, 2011

Jamison said:
Just to clarify: the Condar probe is inside the double wall pipe,and giving me lower readings than the Rutland which I have on the stove top. Just curious as to best positioning of the Rutland and which reading do I believe?

That matches what we see. When she's cruising the T6 will run 600-650F stovetop temp and around 450-500F flue temp. But with a fresh charge of wood we might see a half hour or so at 700F stove, 600F flue once the air has been cut back.

Big Al · Feb 3, 2011

If that's a picture of your stove, I'd put it in the center as far back toward that step as possible. That may or may not be the hottest part. You could try moving it around with a poker during a burn. I found the hottest part of my stove is to the left of the flue collar a few inches out. Also you may want to calibrate the Rutland in your oven. Set to to say, 400*, let it preheat and put the Rutland in there. Should give you an idea if it's close. As far as the flue temp, mine is single wall and the flue temp is 200 less that stove top when it's cruising along with secondaries going. They say the internal temp is 2x the surface temp which would put internal temps ABOVE stove top temps. Perhaps someone will chime in who's more familiar with internal variances, but i would think yours would be similar.

pen · Feb 3, 2011

I realize the scale on these probes ends just below 100 degrees, but if you pull it out of the pipe and let it cool to room temps, does the reading look reasonable for room temp? It could be possible that it has gotten bumped or wasn't quit adjusted right from the factory.

At 70 degrees room temp, my probe and BeGreen's both read right at the bottom of the lowest graduation.

When I pulled BeGreen's out of the mailbox and opened the box up cold, the thermometer was reading WAY below those marks. So, even though the scale ends there, the bimetallic coil is capable of reading even lower temps yet, they just didn't include them.

pen

remkel · Feb 3, 2011

Jamison said:
Just to clarify: the Condar probe is inside the double wall pipe,and giving me lower readings than the Rutland which I have on the stove top. Just curious as to best positioning of the Rutland and which reading do I believe?

Sorry- should have read closer......

iceisasolid · Feb 3, 2011

In regards to a two surface flat top stove, which is the best placement for the stove top thermometer: the top surface- where the flue is- or the lower surface -which reads hotter by as much as 150 degrees? I have a rutland magnet thermometer. I have DSP so I don't place it on the pipe.

-Ray

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Stove top vs pipe temperatures

LAndrim

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remkel

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LAndrim

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Battenkiller

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begreen

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Big Al

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pen

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remkel

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iceisasolid

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