thermocouples

J

Thread Starter

J. Nourian

please help me to select the best choice between C, D and G type thermocouples for continuous measuring in Argon or Nitrogen protection gas.

thanks
J. Nourian
 
B

bob peterson

It seems like you have already narrowed it down to three not commonly used T/Cs. Since you made these uncommon choices, it seems possible that there are some other issues in play here that you have not chosen to tell us about. it is very hard to give you good advice about this kind of thing without having all the facts.

One thing that is especially important is to tell us what the temperature range is that the T/Cs will see.

I am not familiar with the term "protection gas". Perhaps you can elaborate on just what it is you are doing.

--
Bob
 
This company, Omega, comes up first in a Google search for 'thermocouples' (at least in the Northern Hemisphere; I think Google searches are region-dependent and also somewhat controlled depending on which part of the world one tries to execute a Google search from--not to mention Google now accepts ... money for moving to the top of search results....).

Here is a link to their "main" temperature measurement selection page:

http://www.omega.com/toc_asp/sectionSC.asp?section=A&book=temperature

(remove any spaces inserted by control.com software after pasting into your preferred search engine's address bar).

There is a 'Thermocouple Selection Guide' I've used many times and referred many people to for choosing a thermocouple. This company is great for finding out information about all kinds of sensors (temperature, pressure, flow, level, even data acquisition).

They used to publish several books they would send for free (it wasn't even required to pay shipping fees!). I think now, all of that information is available on line, for download.

But, this kind of question is a great question for any <b>reputable</b> vendor or manufacturer representative you deal with. You should be able to present them with your conditions and requirements and they should be able to make recommendations, including type of thermocouple and type of configuration (thermowell; rake; etc.) to best suit your needs. Some will even be able to provide T/C extension wire (which will be necessary if you use thermocouples).

Learn to use your vendors; you'll quickly find out which ones are "worth their salt" and which aren't. Of course, you may have to pay a little more for this kind of service, and one should always have some idea of what they're looking for and possibly do some research, including asking another vendor, if there are any doubts. But, this kind of service is something which any good company will provide--helping to choose the proper sensor and configuration for the application. Good companies, with good people, have helped many other people and in some cases have training from the manufacturers they work for or represent. Take advantage of the knowledge and information they have to offer. Sometimes, they will save you lots of money, time, and effort--and provide you with a better choice than you might have come up with yourself. By providing this kind of service, vendors hope to distinguish themselves from other vendors to get more of your business in the future. This is how they do it--by providing "service" along with products.

Sometimes, you just have to make a choice, though....

Another good resource for questions like this is www.wikipdedia.org. (though I'm told that's blocked in some regions of the world).
 
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