S3197089 sensor report
From Physical Programming
Temperature Sensor
How It Works
A system called a thermocouple is often used as the sensing element in a thermal sensor. The principle based on that two dissimilar metals always have a contact potential between them, and this contact potential changes as the temperature changes. This requires 2 of these systems to accurately record temperature because the contact potential needs to have a comparison in changes. One particular advantage of thermocouples is that the sensing elements themselves are very small, allowing thermocouples to be inserted into very small spaces and to respond to rapidly changing temperatures.
