The sensor is the element that measures the temperature. The most used are: Pt100, Pt1000, NTC, PTC, Thermocouple, DS18B20, KTY.
The temperature probe includes the sensor as well as all the elements around it. A smooth tube probe is for example composed of the following main elements: Sensor, protection tube, resin, cable, connectors.
Temperature sensor
To choose a temperature sensor, it is necessary to take into account the data acquisition system and the constraints of the measurement. The acquisition system can constrain the choice of sensor. If your system only accepts thermocouples or resistance thermometers you will not be able to use other sensors.
The measurement constraints must then be taken into account: Measurement range / Desired accuracy / Drift over time / Response time / Electrical characteristics
Temperature sensor
To choose a temperature probe, the environment and the application must be taken into account. We will not use the same probe to measure the temperature of an electric motor and an air temperature.
There are many parameters to take into account: Temperature range / Size / Response time / Communication and connection / Electrical insulation / Certification / Protection index / Fixing