Stove Temps and Thermometers
- Muddy Jeep
- Member
- Posts: 70
- Joined: Wed. Sep. 24, 2014 8:09 pm
- Location: Uniontown, PA
- Hand Fed Coal Furnace: Hot Blast 1557
- Other Heating: Oil Furnace & Propane Fireplace
So Santa brought me an infrared thermometer for Christmas and I tested it out last night for the first time. Something is puzzling me though. At first I was thinking my older magnetic thermometers were wayyyy off because I was getting readings of around 100°+ over what they were indicating. But then I shot the magnetic thermometer with the infrared and it read exactly what it was showing. What is going on here? How can the temp vary that much just an inch or so away? Sorry about the sideways pics....I can't figure out how to rotate them.
Attachments
- Lightning
- Site Moderator
- Posts: 14669
- Joined: Wed. Nov. 16, 2011 9:51 am
- Location: Olean, NY
- Stoker Coal Boiler: Modified AA 130
- Coal Size/Type: Pea Size - Anthracite
Are you hitting the thermometer directly? It's bound to be cooler than the stove skin underneath it. Plus the thermometer itself can act as a heat sink and draw some heat away from the surface directly underneath it.
- Muddy Jeep
- Member
- Posts: 70
- Joined: Wed. Sep. 24, 2014 8:09 pm
- Location: Uniontown, PA
- Hand Fed Coal Furnace: Hot Blast 1557
- Other Heating: Oil Furnace & Propane Fireplace
I'm pretty sure I was hitting the thermometer directly. I tried multiple times with similar results. I expected it to be a little bit cooler as it is slightly further away from the stove skin. But 120° cooler seemed puzzling to me.
- michaelanthony
- Member
- Posts: 4550
- Joined: Sat. Nov. 22, 2008 10:42 pm
- Location: millinocket,me.
- Hand Fed Coal Stove: Vigilant 2310, gold marc box stove
- Hand Fed Coal Furnace: Gold Marc Independence
- Baseburners & Antiques: Home Sparkle 12
- Coal Size/Type: 'nut
- Other Heating: Fujitsu mini split, FHA oil furnace
Your magnetic thermometer is telling you IT'S temp, not the stove...built in fail, many of us have ditched the over priced refrigerator magnets
- davidmcbeth3
- Member
- Posts: 8505
- Joined: Sun. Jun. 14, 2009 2:31 pm
- Coal Size/Type: nut/pea/anthra
I just use my finger ... I'm able to put my finger on the stove top for 5 sec...its about 120F
4 sec ... 150F
3 sec ... 200F
2 sec ... 300F
1 sec....350F
1/2 sec ... 450F
0.001 sec ... 600F
I take and avg of 10 measurements if possible.
Also, reflective glass is not accurately measured by IR gun.
4 sec ... 150F
3 sec ... 200F
2 sec ... 300F
1 sec....350F
1/2 sec ... 450F
0.001 sec ... 600F
I take and avg of 10 measurements if possible.
Also, reflective glass is not accurately measured by IR gun.
- Muddy Jeep
- Member
- Posts: 70
- Joined: Wed. Sep. 24, 2014 8:09 pm
- Location: Uniontown, PA
- Hand Fed Coal Furnace: Hot Blast 1557
- Other Heating: Oil Furnace & Propane Fireplace
No not yet but I will and see what reading that yields.Lightning wrote:Did you try moving the stove thermometer and measuring the stove skin precisely where it was sitting?
This is just too funnydavidmcbeth3 wrote:I just use my finger ... I'm able to put my finger on the stove top for 5 sec...its about 120F
4 sec ... 150F
3 sec ... 200F
2 sec ... 300F
1 sec....350F
1/2 sec ... 450F
0.001 sec ... 600F
I take and avg of 10 measurements if possible.
Also, reflective glass is not accurately measured by IR gun.
- BunkerdCaddis
- Member
- Posts: 708
- Joined: Sun. Jan. 18, 2015 10:26 am
- Location: SW Lancaster County
- Stoker Coal Boiler: Bairmatic-Van Wert
- Hand Fed Coal Boiler: Van Wert VW85H
- Hand Fed Coal Stove: Saey Hanover II working when I feel the desire, Waterford 105 out on vacation, Surdiac Gotha hiding somewhere
- Coal Size/Type: pea/nut/rice/stove-anthracite, nut/stove bit when I feel the urge
- Other Heating: oil fired hydronic
It's AMAZING what you can do with a finger...davidmcbeth3 wrote:I just use my finger ...
- 2001Sierra
- Member
- Posts: 2211
- Joined: Wed. May. 20, 2009 8:09 am
- Location: Wynantskill NY, 10 miles from Albany
- Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
- Coal Size/Type: Rice
- Other Heating: Buderus Oil Boiler 3115-34
Here are my results, Infrared, Magnetic, and Immersion.
Attachments
-
- Member
- Posts: 558
- Joined: Thu. Sep. 04, 2014 10:01 am
- Location: Western NY 14141
- Stoker Coal Boiler: Keystoker KB-8
- Coal Size/Type: Buckwheat
- Other Heating: Utica Propane Hot Water
Now that is a interesting picture to look at.2001Sierra wrote:Here are my results, Infrared, Magnetic, and Immersion.
- Muddy Jeep
- Member
- Posts: 70
- Joined: Wed. Sep. 24, 2014 8:09 pm
- Location: Uniontown, PA
- Hand Fed Coal Furnace: Hot Blast 1557
- Other Heating: Oil Furnace & Propane Fireplace
OK so I took a reading using the infrared thermometer 1" to the left of where the magnetic thermometer was and then removed the magnet and took a reading where it was attached. I saw a 6° increase with the higher reading being under the magnet. Which still means I am seeing about a 100° drop from the stove skin to the reading on the magnet. I feel like I've been misled over the past year as to how well my stove was actually running. There was a time or two last year that the stove was got up to 550° or so I thought. It may have been more like 650° or more....yikes.
It looks like your infrared and magnetic thermometers are reading about the same. Obviously as stated the temp inside the pipe is much higher.2001Sierra wrote:Here are my results, Infrared, Magnetic, and Immersion.
- davidmcbeth3
- Member
- Posts: 8505
- Joined: Sun. Jun. 14, 2009 2:31 pm
- Coal Size/Type: nut/pea/anthra
All looks good there. Hooray !2001Sierra wrote:Here are my results, Infrared, Magnetic, and Immersion.
Just shot my frig magnet on the stove pipe (magnetic thermometer) mounted 2 inches above the stove collar.
The magnet thermometer is reading 360.
The IR gun said the surface of the thing was 295
The stove pipe surface one inch next to it is 265.
Yep almost exactly 100 degrees off.
I just have it on there for a quick reference look. I know what the real temps should be and a quick glance tells me I'm off low or off high. I don't care what the thing really says. It's kinda nostalgic anyway.
The magnet thermometer is reading 360.
The IR gun said the surface of the thing was 295
The stove pipe surface one inch next to it is 265.
Yep almost exactly 100 degrees off.
I just have it on there for a quick reference look. I know what the real temps should be and a quick glance tells me I'm off low or off high. I don't care what the thing really says. It's kinda nostalgic anyway.
- Muddy Jeep
- Member
- Posts: 70
- Joined: Wed. Sep. 24, 2014 8:09 pm
- Location: Uniontown, PA
- Hand Fed Coal Furnace: Hot Blast 1557
- Other Heating: Oil Furnace & Propane Fireplace
Hmm...that's interesting. Yours is reading 100° off but in the opposite direction of mine. My magnetic thermometer was reading cooler than what the IR gun was reading. And your magnetic is reading hotter than your IR.blrman07 wrote:Just shot my frig magnet on the stove pipe (magnetic thermometer) mounted 2 inches above the stove collar.
The magnet thermometer is reading 360.
The IR gun said the surface of the thing was 295
The stove pipe surface one inch next to it is 265.
Yep almost exactly 100 degrees off.
I just have it on there for a quick reference look. I know what the real temps should be and a quick glance tells me I'm off low or off high. I don't care what the thing really says. It's kinda nostalgic anyway.