SoundClown
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Registered: 17-12-2018
Location: Narnia, USA
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Mood: Hungry Like the Wolf
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Hotplate continuing to emanate heat despite being unplugged?? (The Phantom Hotplate?)
Hello all. A few months ago I acquired a Thermolyne Type 1900 hot plate (Model HP-A1915B/Hotplate ONLY) and upon testing it's functionality with a
thermometer gun, I discovered an issue. This is the first laboratory based heating device I have ever encountered that CONTINUES to produce heat
despite being UNPLUGGED?? I apologize if this isn't the correct posting place but this just really freaked me out lol would there be any type of
explanation to this? After unplugging, I point my thermogun to the center of the plate and record temps INCREASING. It's not uncontrollably exceeding
in nature and I'm able to cool it down with a water bath and subtle knob adjustments, but the device is UNPLUGGED at this point and should have ceased
to circulate any form of energy. Thoughts / explanations? I can post photos and what not if need be
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HydrogenSulphate
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Quote: Originally posted by SoundClown  | | Hello all. A few months ago I acquired a Thermolyne Type 1900 hot plate (Model HP-A1915B/Hotplate ONLY) and upon testing it's functionality with a
thermometer gun, I discovered an issue. This is the first laboratory based heating device I have ever encountered that CONTINUES to produce heat
despite being UNPLUGGED?? I apologize if this isn't the correct posting place but this just really freaked me out lol would there be any type of
explanation to this? After unplugging, I point my thermogun to the center of the plate and record temps INCREASING. It's not uncontrollably exceeding
in nature and I'm able to cool it down with a water bath and subtle knob adjustments, but the device is UNPLUGGED at this point and should have ceased
to circulate any form of energy. Thoughts / explanations? I can post photos and what not if need be |
Not powered by uranium, is it?  Unusual to say the least, but some do take a
seemingly long time to cool down.
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Fulmen
International Hazard
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Registered: 24-9-2005
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It's called thermal conductivity.
We're not banging rocks together here. We know how to put a man back together.
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Fyndium
International Hazard
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Registered: 12-7-2020
Location: Not in USA
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Thermal mass and stuff like that. My hotplate takes a good hour to settle. Issue when you don't need no more heating but gotta keep stirring. Hence I
got separate stirrers to switch for.
CaCl2 salt heating baths easily keep their heat to the next day, if they are small like 1-2 liters. Larger ones much longer than that.
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Vomaturge
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Registered: 21-1-2018
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Mood: thermodynamic
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When it's powered, the elements and the interior of the metal plate are hotter than the surface which is losing heat to whatever you're heating. If
you kill the power and remove whatever container you were heating, that heatsink is removed, and the heat from the interior will keep diffusing to the
outside. You may have a brief rise in temperature before the whole device has cooled off.
I now have a YouTube channel. So far just electronics and basic High Voltage experimentation, but I'll hopefully have some chemistry videos soon. |
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MidLifeChemist
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Location: West Coast USA
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yes, that's normal
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SoundClown
Harmless
Posts: 17
Registered: 17-12-2018
Location: Narnia, USA
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Mood: Hungry Like the Wolf
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Thank you for the feedback everyone! Much love <3 Again I've worked with everything from corning PC's to cheaply assembled heating mantles and
never have I observed surface temperature increases upon outlet disconnection. 45 degrees celsius @ 5 min... disconnect.... temp reads ~60 degrees 10
mins later? I suspect the aluminum surface may play a role in the prolonged heating
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