...agree^^^sounds good, looks good! You said a mouthful in your thermometer thread in regards to internal flue pipe temps, I am curious to hear your flue pipe temps during various stages of fire. Your observation has me considering an internal thermometer as well.hotblast1357 wrote:sounds perfect, you don't want it below -.005 or above -.05.
Dwyer Magnehelic Install
- 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
- Smokeyja
- Member
- Posts: 1997
- Joined: Mon. Nov. 21, 2011 6:57 pm
- Location: Richmond, VA.
- Baseburners & Antiques: Glenwood #6 baseheater, Richmond Advance Range, WarmMorning 414a x2
- Coal Size/Type: Nut / Anthracite
- Other Heating: none
- Contact:
Well I thought it would be a lot closer to the surface temp . But the mistake I made was ever trusting these magnetic thermometers . I knew there was a difference in internal temps but not the poor mechanics of the mag thermometers .michaelanthony wrote:...agree^^^sounds good, looks good! You said a mouthful in your thermometer thread in regards to internal flue pipe temps, I am curious to hear your flue pipe temps during various stages of fire. Your observation has me considering an internal thermometer as well.hotblast1357 wrote:sounds perfect, you don't want it below -.005 or above -.05.
I'll post more in the thermometer thread but I will say the thermocouple in the flu peaked over 1000°F while getting the wood fire going while the surface thermometer didn't budge over 200° .
- Sunny Boy
- Member
- Posts: 25726
- Joined: Mon. Nov. 11, 2013 1:40 pm
- Location: Central NY
- Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
- Baseburners & Antiques: Glenwood range 208, # 6 base heater, 2 Modern Oak 118.
- Coal Size/Type: Nuts !
- Other Heating: Oil &electric plenum furnace
If you were to use a hand-held, long probe type K thermocouple, you'd also see a pretty good range of temps inside the pipe. Hottest being nearest to the center of the pipe where the inner most gas stream is insulated by the outer layer of gases and is not losing heat to the pipe.Smokeyja wrote:Well I thought it would be a lot closer to the surface temp . But the mistake I made was ever trusting these magnetic thermometers . I knew there was a difference in internal temps but not the poor mechanics of the mag thermometers .michaelanthony wrote:
...agree^^^sounds good, looks good! You said a mouthful in your thermometer thread in regards to internal flue pipe temps, I am curious to hear your flue pipe temps during various stages of fire. Your observation has me considering an internal thermometer as well.
I'll post more in the thermometer thread but I will say the thermocouple in the flu peaked over 1000°F while getting the wood fire going while the surface thermometer didn't budge over 200° .
And it varies where along the length of the pipe, too. Flow turbulence around bends and past an MPDs can cause the hottest stream of gases to shift away from the pipe center. Using an IR gun you can see different parts of the pipe are hotter and it doesn't always relate to distance from the stove collar.
Paul
-
- Member
- Posts: 1769
- Joined: Tue. Feb. 19, 2013 3:30 pm
- Location: Mystic CT
- Hand Fed Coal Stove: Crane 404
- Contact:
I have used a probe since wood burning days and ignore magnetic ones entirely as just stove trinkets at best. I never got to the burn zone with magnetic yet never had any creosote either as always ran with probe in the 300 to 400 range well out of harms way. Surface to probe I have found to be a bit over 2X more on probe 180 surface close to 400 probe typical.
- Smokeyja
- Member
- Posts: 1997
- Joined: Mon. Nov. 21, 2011 6:57 pm
- Location: Richmond, VA.
- Baseburners & Antiques: Glenwood #6 baseheater, Richmond Advance Range, WarmMorning 414a x2
- Coal Size/Type: Nut / Anthracite
- Other Heating: none
- Contact:
Paul I am using K type thermocouples so I am seeing that range you are talking about . Check out the thermometer thread on the hardware I purchased and installed . And I already notice a slight difference with the Mercury filled gauge which uses a large bulb probe right in the upper 90° bend . It's about 30° F cooler just in that short distance . I am also using a K type thermocouple probe in the firepot .Sunny Boy wrote:
If you were to use a hand-held, long probe type K thermocouple, you'd also see a pretty good range of temps inside the pipe. Hottest being nearest to the center of the pipe where the inner most gas stream is insulated by the outer layer of gases and is not losing heat to the pipe.
And it varies where along the length of the pipe, too. Flow turbulence around bends and past an MPDs can cause the hottest stream of gases to shift away from the pipe center. Using an IR gun you can see different parts of the pipe are hotter and it doesn't always relate to distance from the stove collar.
Paul
It's fun to watch the Magnehelic move upwards with the temp going up . I just think this is all amazing to watch .
- Smokeyja
- Member
- Posts: 1997
- Joined: Mon. Nov. 21, 2011 6:57 pm
- Location: Richmond, VA.
- Baseburners & Antiques: Glenwood #6 baseheater, Richmond Advance Range, WarmMorning 414a x2
- Coal Size/Type: Nut / Anthracite
- Other Heating: none
- Contact:
I wish I had done this from the beginning . I'm not sure why I wasted my time and money on anything else to this point .ddahlgren wrote:I have used a probe since wood burning days and ignore magnetic ones entirely as just stove trinkets at best. I never got to the burn zone with magnetic yet never had any creosote either as always ran with probe in the 300 to 400 range well out of harms way. Surface to probe I have found to be a bit over 2X more on probe 180 surface close to 400 probe typical.
-
- Member
- Posts: 1769
- Joined: Tue. Feb. 19, 2013 3:30 pm
- Location: Mystic CT
- Hand Fed Coal Stove: Crane 404
- Contact:
I think the largest problem is putting a flat thermometer on a round pipe lets room air cool off the thermometer.Smokeyja wrote:I wish I had done this from the beginning . I'm not sure why I wasted my time and money on anything else to this point .ddahlgren wrote:I have used a probe since wood burning days and ignore magnetic ones entirely as just stove trinkets at best. I never got to the burn zone with magnetic yet never had any creosote either as always ran with probe in the 300 to 400 range well out of harms way. Surface to probe I have found to be a bit over 2X more on probe 180 surface close to 400 probe typical.
- Sunny Boy
- Member
- Posts: 25726
- Joined: Mon. Nov. 11, 2013 1:40 pm
- Location: Central NY
- Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
- Baseburners & Antiques: Glenwood range 208, # 6 base heater, 2 Modern Oak 118.
- Coal Size/Type: Nuts !
- Other Heating: Oil &electric plenum furnace
That's why mines on a vertical section, not horizontal. There was too much difference in IR gun reading and magnetic gauge reading. Moved it to a vertical section on the stove side and just a few feet above the stove collar and it reads the same surface temps as the IR gun reads on the pipe surface next to it.ddahlgren wrote:I think the largest problem is putting a flat thermometer on a round pipe lets room air cool off the thermometer.Smokeyja wrote:
I wish I had done this from the beginning . I'm not sure why I wasted my time and money on anything else to this point .
Works well for seeing what the stove is doing at a glance, without always having to pick up the I R gun.
Not sure all the Rutland magnetic are this accurate. And I'm amazed it's stayed this accurate for 10 years now. Often bi-metallic types loose some range with use and years. I've got other bi-metaling gauges and most were only good for paper weights !
Paul
- Smokeyja
- Member
- Posts: 1997
- Joined: Mon. Nov. 21, 2011 6:57 pm
- Location: Richmond, VA.
- Baseburners & Antiques: Glenwood #6 baseheater, Richmond Advance Range, WarmMorning 414a x2
- Coal Size/Type: Nut / Anthracite
- Other Heating: none
- Contact:
My newest Rutlands one is 100% crap . The older ones I bought a few years back have gotten me through all the other winters burning with good results ,although still inaccurate, at least it was a consistent inaccuracy .Sunny Boy wrote:
That's why mines on a vertical section, not horizontal. There was too much difference in IR gun reading and magnetic gauge reading. Moved it to a vertical section on the stove side and just a few feet above the stove collar and it reads the same surface temps as the IR gun reads on the pipe surface next to it.
Works well for seeing what the stove is doing at a glance, without always having to pick up the I R gun.
Not sure all the Rutland magnetic are this accurate. And I'm amazed it's stayed this accurate for 10 years now. Often bi-metallic types loose some range with use and years. I've got other bi-metaling gauges and most were only good for paper weights !
Paul
If anything I really didn't need the Magnehelic gauge to figure anything out . It's just neat to watch . My wife said now instead of a classy rustic look I went for the mad scientist look.
Haha
- Sunny Boy
- Member
- Posts: 25726
- Joined: Mon. Nov. 11, 2013 1:40 pm
- Location: Central NY
- Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
- Baseburners & Antiques: Glenwood range 208, # 6 base heater, 2 Modern Oak 118.
- Coal Size/Type: Nuts !
- Other Heating: Oil &electric plenum furnace
Sure,....... but, only if you ignore convection currents and the heat coming off the longer length of vertical pipe below the magnetic gauge that is pre-heating the air before it gets to the gauge.ddahlgren wrote:Vertical or horizontal makes no difference the pipe round the magnet flat.
Here you can see my IR gun is reading 115F. And the magnetic gauge needle is reading above 100F, just shy of a being a quarter of the way to 200F - close to where 115F would be if the gauge had a scale with more divisions.
Paul