Temperature measurements are among the most common data logging applications. There are 4 main types of temperature sensors that are used with data loggers for measuring temperature:
Thermocouples which generate a voltage proportional to temperature are the most common type of temperature sensor and are widely used where cost, simplicity and operating range are important and extremely high accuracy is not required. RTD’s and thermistors provide a change in resistance that is related to temperature and while to offer higher accuracy than thermocouples the have a more limited operating range. Semiconductor devices provide an output voltage or current proportional to temperature and offer low cost devices with a limited operating range and accuracy comparable to thermocouples.