Explanation of the terms needs to be divided into two categories →
sensitivity of hardware and sensitivity of the sensor.
The sensitivity of hardware represents the smallest possible step detected by
the hardware. Usually, the sensitivity of the hardware is supposed to be higher
than the sensitivity of the sensor, if not the response from the sensor will not
be detected correctly.
The sensitivity of the sensor is when the outer/external condition evokes a
change in the output of the sensor. The higher the change of the output at a
certain given external condition, the higher the sensitivity of a sensor.
Let’s have two sensors, A and B, and the temperature change of temperature (external
condition) 10 °C. The response of sensor A will change by 10 mV, and the
response from sensor B by 1 mV. According to the previous definition, sensor
A is more sensitive than sensor B.
In the case of a thermocouple, the sensitivity will be given in mV