infrared temperature sensor emissivity

[vscid]

I am looking for an Infrared sensor for measuring TIG welding temperature at every pass (interpass temperature). Should I go for a fixed or variable emissivity instrument?

What is the difference between the two realy?

Thanks!

 

[Heckler]

Here is a website that could be helpful.

http://www.melexis.com/Sensor_ICs_Infrared_and_Optical/Infrared/Thermometer_139.aspx

Here is another good website

http://www.temperatures.com/

Another good link

http://www.temperatures.com/eindex.html

Heckler
Sr. Mechanical Engineer
SWx 2007 SP 4.0 & Pro/E 2001
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This post contains no political overtones or undertones for that matter and in no way represents the poster's political agenda.

 

[IceStationZebra]

I would go for the variable emissivity since I assume you want to measure the molten metal? And I also assume there will be some sort of protective shield? By using a variable sensor you can calibrate for your specific set-up. ISZ