To 大力:
First, you must know the character of the signal that you wanna measure. So that you can select a sensor. There are three kinds of sensor that used for measuring temperature. One is Thermocouple, another is RTD and Thermistor. First one is good at fast response, second one is good at high accuracy. Refer here for more information about the sensors.
Second, selecting the NI devices for measuring temperature depends on what kind of sensor you use. You can use PXI, cDAQ, SCXI or cFP to make the system, such as PXI-4351(Thermocouple, RTD and Thermistor), cDAQ-9211(Thermocouple), cDAQ-9217(RTD), SCXI-1112(Thermocouple, RTD and Thermistor), cFP-RTD-122(RTD) and NI cFP-TC-120(Thermocouple).
Finally, use LabVIEW to programme the application.