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?
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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 308 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
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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.
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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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