Thermocouples are a great way to take accurate temperature measurements in hard to reach places or in very rugged environments. Using one can be tricky if your new to the device. This circuit has two parts the thermocouple needs to be driven by a device and then an amplifier can be used to amplify and offset the voltage into a signal that can be useful. In this circuit the output of the amplifier Vout = 10mv/°C when using a K-Type thermocouple.
How to Driving and Measure a Thermocouple - [Link]