Old vs. New

[thewoodlands]

I stopped by our local hearth shop to pick up a new Chimgard Thermometer for the stove top. I wanted to see if there was a difference in the temp readings. The old thermometer is on the left and the new on the right, the new one has been on only one hour with a big difference in the temp readings.


Zap

 

[wkpoor]

In yrs past I would have 2 on the stove top at any one time as a constant comparison. All together I have 4. Wonder what the chances are all 4 go bad at once.

 

[remkel]

Put a new thermometer on my stove top and was getting some insane readings- 150 degree difference between the two thermometers. With the heat coming off the stove decided the old one was the better reading. I know that my stove is not cruising at 750 degrees!

 

[bogydave]

Like moisture meters in a discussion here, your 25% may be my 15%
Calibrate stove temps for your use, burn for the temps you feel comfortable with,

PS: Red hot is "to Hot" :bug:

wkpoor,
What do you do "Average the 4 & call that the temp" ??

I use my smell, too hot of metal gives off different unique odors,

(blisters my nose though, but it heals LOL)

 

[wkpoor]

Put a new thermometer on my stove top and was getting some insane readings- 150 degree difference between the two thermometers. With the heat coming off the stove decided the old one was the better reading. I know that my stove is not cruising at 750 degrees!

Might want to get a 3rd opinion. Or compare with an IR thermometer. 750 could have easily been right.

 

[tickbitty]

Yikes. I have that same thermometer. What if the cooler one was at 700 - you'd be overfiring and not know it! Maybe a good reason to get that infrared thermometer I was thinking about...

 

[remkel]

Put a new thermometer on my stove top and was getting some insane readings- 150 degree difference between the two thermometers. With the heat coming off the stove decided the old one was the better reading. I know that my stove is not cruising at 750 degrees!

Might want to get a 3rd opinion. Or compare with an IR thermometer. 750 could have easily been right.

Been looking into an IR thermometer. Reason I suspect the new one is way off is because of the THIRD thermometer I have on the pipe- readings on there have been consistent throughout and consistent with reports I have gotten from other people with similar stove.

 

[wkpoor]

Been looking into an IR thermometer. Reason I suspect the new one is way off is because of the THIRD thermometer I have on the pipe- readings on there have been consistent throughout and consistent with reports I have gotten from other people with similar stove.

Other persons quoted temps would not be an indicator to me at all. Variables like wood species, wood moisture, chimney type, chimney height, and so on can affect stove temps greatly.

 

[Battenkiller]

Put a new thermometer on my stove top and was getting some insane readings- 150 degree difference between the two thermometers. With the heat coming off the stove decided the old one was the better reading. I know that my stove is not cruising at 750 degrees!

Might want to get a 3rd opinion. Or compare with an IR thermometer. 750 could have easily been right.

A big +1 on that thought. ;-)

 

[begreen]

L
PS: Red hot is "to Hot" :bug:

Not too hot for a stove top.

 

[begreen]

Put a new thermometer on my stove top and was getting some insane readings- 150 degree difference between the two thermometers. With the heat coming off the stove decided the old one was the better reading. I know that my stove is not cruising at 750 degrees!

Might want to get a 3rd opinion. Or compare with an IR thermometer. 750 could have easily been right.

A big +1 on that thought. ;-)

As a check I'd also reverse their positions in case one is over a hot (or cool) spot.

 

[Backwoods Savage]

I've had the same thing with the Rutland's. The best we've found are the Condar and we get ours from Woodstock.

 

[remkel]

Could not let this go tonight so i went downstairs to fill the old beast for the night. Took the three thermometers and placed them within proximity of each other:

Results:

Condar- 600
Old Rutland-620
New Rutland- 750

Still going to get the IR, but feeling a little more comfortable with where the stove is running now. Seems the new Rutland tends to "take off" when the stove hits 500 or so whereas the other two continued on a more expected rise pattern.

 

[begreen]

It's the OMG! effect.

 

[wkpoor]

I've got 4 rutlands. They all match pretty close and with the IR too.

 

[remkel]

It's the OMG! effect.

Yes OMG and a few other expletives I hope my children did not hear.

 

[thewoodlands]

Tonight I have the new thermometer on the left with some cherry splits going, attached are some pictures. Temps are stove top temps.


Zap

 

[tickbitty]

Huh. So it had a learning curve?

 

[BrotherBart]

I can use the IR gun on the 30 and get a different temp every two inches apart. One thing you will find is with a N/S load there will be one side where the secondary burn blast is hotter than the other side if you do those things.

I have a couple of the new style Rutlands that I should sell to people for over fire warranty insurance. They are accurate right up to six hundred degrees. Where they both stop. They were both on the stove on the 900 degree blast the other night and never went over six hundred. The old style large Rutland sitting between them was dead on.

"No I did not ever overfire that stove. It has never been over six hundred degrees!"

 

[remkel]

I can use the IR gun on the 30 and get a different temp every two inches apart. One thing you will find is with a N/S load there will be one side where the secondary burn blast is hotter than the other side if you do those things.

I have a couple of the new style Rutlands that I should sell to people for over fire warranty insurance. They are accurate right up to six hundred degrees. Where they both stop. They were both on the stove on the 900 degree blast the other night and never went over six hundred. The old style large Rutland sitting between them was dead on.

"No I did not ever overfire that stove. It has never been over six hundred degrees!"

Well, my new Rutland was just the opposite- took off like an SOB compared to my other thermometers. Guess I just got the hyperactive spring on that one- kind of like my personality.

 

[Stump_Branch]

I think there is a slight difference in mechanics with the thermos.
A rutland has a needle that is centrally pivoted. The other "more accurate ones" (so i hear) use the bi-metallic material as the needle. There must be a mechanical advantage to tahat over trying to transfer the energy to a needle. of course this has to be minimal at best, they do function slighty different.

 

[bpm44]

They look pretty close now Zap - how old was the first one? I had replaced mine at one point and did notice a difference (100 degrees) but that Condar was almost 10 years old, so I guess I don't expect the little bimetallic metal coil to be accurate forever. I also notice a big difference in temp just a couple inches apart, but my IR and two Condars are all within about 30 degrees of each other. I just leave one on the stovetop and occasionally compare between or rotate them. I sort of view gauge replacement now like changing batteries in a smoke detector - it's something that just needs to be done. I'm going to keep doing it every other season, which might be overkill, but I like overkill. Plus it's always fun to go take a peek at the stove shop!

 

[thewoodlands]

They look pretty close now Zap - how old was the first one? I had replaced mine at one point and did notice a difference (100 degrees) but that Condar was almost 10 years old, so I guess I don't expect the little bimetallic metal coil to be accurate forever. I also notice a big difference in temp just a couple inches apart, but my IR and two Condars are all within about 30 degrees of each other. I just leave one on the stovetop and occasionally compare between or rotate them. I sort of view gauge replacement now like changing batteries in a smoke detector - it's something that just needs to be done. I'm going to keep doing it every other season, which might be overkill, but I like overkill. Plus it's always fun to go take a peek at the stove shop!

The old one was bought in May 2009 just after we had the Liberty installed.


Zap

 

[begreen]

That's why I said reverse positions of the thermometers. The stove top is not even temperatured all across the top. Find a location that is average and put the thermometer there. These are not precision instruments.