Do I need with an isolated junction thermocouples?

I have an application where I need to measure the temperature of the surface at various locations (about 20 to 30 points).

I use a cDAQ with several modules of NI9211 chassis.

The surface to be measured is copper.  I fear that there may be some spurious signals generated between the channels if the thermocouples are not electrically isolated from the surface.

I have to use thermocouples with insulated junction?

Hello egret2008,

You are absolutely correcct thinking you need insulation.  Without it, you will get bad readings, and interference between different thermocouples. To get your isolation, you will want to use a high-thermal connectivity equipment, electric bass.  Suppliers like Omega sell cements and fat with these properties.  I hope this helps and good luck in your application!

Tags: NI Hardware

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