Temperature sensor has a number of characteristics, combination of which allows to compare particular temperature sensors as well as to select particular temperature sensors that are most suitable for particular tasks.
Thus, in most cases it is possible to obtain correct temperature measurements results with the help of temperature sensors.
Rapid developement of electronics caused wide automation of various processes in industry, scientific research and everyday life. Thus, temperature sensors installed in the nuclear reactor area allow to evaluate many thermal power parameters, including pressure, density, reactor vessel level, etc. The temperature sensors are also used in everyday life for heating control based on the input and output temperature difference of the HW loop, ambient and room temperature control, washing machine water heating adjustment, electric cooker and oven temperature control, etc.
Temperature sensor operating principle is based on calibrated resistance measurements. Dependence of sensor resistance on temperature is called graduation. Resistance thermoters based on platinum wire or ceramics with platinum coating are most precise and durable. Temperature dependence is almost linear – at positive temperatures it is determined by square law, at negative temperatures – by 4 power equation.