glassplass
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Thermometer choice
Hi folks!
I need quick help.
Which thermometer is better to use in distillation aparatus,total or partial immerised?
The thing is little bit confusing.
I thing 76mm partial immerised is good option but i am not sure.
Please help! 
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aga
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yes, you are right.
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arkoma
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This is a good question. Shit confuses me too, and I don't even KNOW what my chinese thermometers are--no markings. Blogfast, can ya weigh in and
enlighten us perhaps?
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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S.C. Wack
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Never buy a total immersion thermometer unless you need one.
Check your thermometers for a line aound them at a certain distance from the bulb.
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Dr.Bob
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For most distillations, you typically want a 1-3" immersion thermometer, so the vapors are covering the part from the bulb to the line. Depends on
the particular distillation head, and the length of it.
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Sulaiman
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AFAIK if there is no line or text to indicate immersion level then it is a total immersion thermometer.
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j_sum1
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In practice, how much difference will it make?
The column is a small fraction of the total volume. I can't imagine that it would throw out the reading at a significant level for most applications.
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DJF90
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There are stem corrections you can apply to a total immersion thermometer that is being used for partial immersion.
See here (at the bottom of the page)
http://www.coleparmer.co.uk/TechLibraryArticle/670
EDIT: Also see attached paper
[Edited on 17-3-2016 by DJF90]
Attachment: A nomograph for emergent stem correction of thermometers.pdf (87kB)
This file has been downloaded 284 times
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arkoma
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Thanx DJF, between the link and the nomograph I can begin to make some sense of this. Vogel's Third was a bit obtuse for me.
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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DistractionGrating
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There is this link too: http://www.icllabs.com/thergenlinfo.html
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chemrox
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Thanks DJF90- I printed and posted in my lab.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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chemrox
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I like properly marked Hg thermometers. US or German made..
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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