soma
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high temperature thermometer
I'm looking for a high temperature thermometer that can measure 700-1000C. Are there glass thermometers that can do that? Hopefully there's something
inexpensive (around $30?)
I want to use it for converting MgCO3 to light burned MgO.
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Orenousername
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Glass is likely to melt at those temperatures, and even if it does not it will be severely weakened. Go with thermocouples, although I suspect you
will have a hard time finding one that is rated for those temperatures.
Lol nerds
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Tsjerk
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I think you should have a look at an infrared thermometer, I don't think much will survive those temperatures.
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Volanschemia
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Borosilicate glass begins to soften at 820 degrees Celcius, so you definitely wouldn't find boro glass thermometer that can go to 1000.
Quartz glass can go to about 2000 degrees, but I don't know if quartz glass thermometers are very common. I definitely don't think you would get one
for $30.
[Edit] Lol, double ninja'd.
[Edited on 1-7-2016 by Volanschemia]
"The chemists are a strange class of mortals, impelled by an almost insane impulse to seek their pleasures amid smoke and
vapor, soot and flame, poisons and poverty; yet among all these evils I seem to live so sweetly that may I die if I were to change places with the
Persian king" - Johann Joachim Becher, 1635 to 1682.
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soma
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Thanks.
I found a company that makes quartz glass thermometers. They're in Germany. http://www.amarell.de/edefault.htm
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Dr.Bob
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There are simple metal thermocouple thermometers that go up to that temp which will cost less than anything made of quartz. Just look on Omega,
JKem, or other thermocouple sellers for the right type for that temp range.
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careysub
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Use a thermocouple. The common type K is available in models that go to 1260 C. The sensor is cheap and easily replaceable. They respond very quickly
to temp changes. Thermocouple thermometers with dual inputs (use two thermocouples at once) are common. They don't break.
A wide variety of probe constructions are available, from a simple junction at the end two wires, to integrated high temperature metal probes. You can
use borosilicate glass tube with a thermocouple inside, sealed on one end like a glass thermometer. High alumina mullite tubes for thermocouple
protection to the type K max temperature are readily available.
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experimenter_
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Make a simple thermocouple from two high temperature wires (eg. canthal and nickel wire) and connect it to a voltmeter. Calibrate it patiently with
melting points of metals, salts or sth similar.
Not the eaiest to do but the cheapest of all.
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careysub
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You can buy a type K thermocouple on eBay for $1 USD, including shipping.
I doubt very much you buy both a Kanthal and a Nickel wire, however short, for that price.
Using a standard thermocouple allows you to get a thermometer (starting at around $10 on eBay) that directly reads the correct temperature. I cannot
imagine that the inconvenience of constantly having to convert volt readings to actual temperature could be worth the savings of a few dollars (if
indeed, any savings at all is achievable - you would have to already own the voltmeter).
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CharlieA
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A PID controller + a Type K thermocouple (measures to ca. 1500*C) will only set you back about $30.
Google "thermocouple" for a good explanation of different types of thermocouples.
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subsecret
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In open air, a normal thermocouple with all insulation removed will work just fine above 1000C. Just cut off the fiberglass insulation and spread the
wires. Use this if you'll be using some kind of kiln.
Fear is what you get when caution wasn't enough.
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soma
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Thanks to everyone for the information.
I have some supposed MgO that seems to have been exposed to the air for too long and fizzes alot when reacted with ascorbic acid.
I tried putting it in the bottom of a double boiler and covering it with the top of the boiler and heating it on a gas stove for 1/2 hour.
Now it doesn't fizz much but it also reacts very slowly so it seems I hard burned it.
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soma
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I found this temperature controller on ebay for $23. Not sure how to hook up the thermocouple to it. Do they have standard inputs? http://www.ebay.com/itm/AC90-260V-Dual-Digital-F-C-PID-Tempe...
[Edited on 14-7-2016 by soma]
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Fulmen
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The wiring schematics should be printed on the side.
We're not banging rocks together here. We know how to put a man back together.
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soma
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Found another one that comes with TC probes. Thinking to get the K type. http://www.ebay.com/itm/J-ou-K-Type-Thermocouple-Thermometre...
It also comes with thermocouple K wires. Can these wires be put into the heated material and used instead of the probe?
[Edited on 30-7-2016 by soma]
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metalresearcher
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Ebay is your friend.
I have that device and ot works excellently.
For contact measurement I use type S. I have K ones as well, but don't make them too hot (< 1100 C) otherwise they burn out quickly.
Type S is much more expensive (as it contains Pt), but also much more durable and much hotter (1550 C).
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