Thermocouple doubt

Hi Folks, I just bought a MAX6675 Thermocouple module on ebay and i'm wondering if it's good for what i need. I need to mensure the surface of an electrical resistence, But... there's no risk of a short circuit? I can touch the sensor on the surface?

Thanks in advance.

A thermocouple is bare metal. If the resistor has also bare metal at the surface, you have a shortcut !

It seems that some thermocouples are encapsulated. http://www.capgo.com/Resources/Temperature/Thermocouple/Thermocouple.html Perhaps my knowledge of thermocouples is outdated, I know only the bare metal ones.

You can try a contact-less IR temperature meter. They are a few dollars on Ebay and those are already very handy. Fluke has good quality meters of those. http://www.ebay.com/sch/i.html?_nkw=temperature+ir+-motion+-flame+-body+-rgb&_sop=15

A contact-less sensor for the Arduino could be this : http://www.adafruit.com/product/1748

You can get mineral insulated thermocouples. Unfortunately they are housed in a metal sleeve so, while the sensor is insulated from the sleeve the sleeve could still give a short circuit on something like a surface mount resistor.

I have seen thermocouples encapsulated in glass beads but they will be expensive. How about taking a bare thermocouple and encapsulating it yourself in a tiny drop of epoxy resin?

IR sensors have a wide field of view so may not be suitable.

Russell.

Use a TO220 insulating sheet (rubbery grey heat resistant electrically insulating and
thermally conductive material)? Check the temperature range though.

Thanks for the tips!!
I researched those options… A contact-less sensor would be perfect, but I might not work on temperature lower than 350º (not sure).

TO220 only hold 220ºC, but i used the idea to find this material:
http://www.ebay.com/itm/1-6mm-24-Ceramic-Fiber-Heat-Insulation-Blanket-Wood-Stoves-Inserts-/271673466700?pt=LH_DefaultDomain_0&var=&hash=item3f41001f4c,

What do you think? it’s an insulating material, but it can hold the heat instead… epoxy resin would handle high temperature?

or something like that http://www.masterbond.com/properties/thermally-conductive-epoxy-adhesives ?

I found the mineral insulated,

http://www.ebay.com/itm/Mineral-Insulated-Thermocouple-K-Type-Sensors-1mm-/380897235773?pt=AU_B_I_Electrical_Test_Equipment&hash=item58af3e933d

Thanks a lot guys!

Resistive wire at 350 degrees, I call that a toaster. A thermocouple is not accurate to measure a room temperature, but it is the best option for high temperatures. Those mineral encapsulated ones still allow high temperatures. I think you made the right choice.