Definition of the temperature sensor, and classification considerations

Temperature sensor means able to feel the temperature sensor and converted into a usable output signal. The temperature sensor is a core part of the temperature measuring devices, a wide variety. A temperature sensor for measuring the ambient temperature is very accurate, widely used in agriculture, industry, workshops, warehouses, and other fields.
Temperature sensor Category:
Press measurement can be divided into contact and non-contact two categories.
1, the contact
detection section and the measured object contact type temperature sensor in good contact, known as a thermometer.
Thermometer by conduction or convection thermal equilibrium, so that the indication indicates the temperature of the thermometer can be directly measured object.
Usually higher precision measurement. Within a certain temperature range, the thermometer may measure a temperature distribution inside the object. But for the moving body, the heat capacity is very small or small target object will have a greater measurement errors commonly thermometer bimetal thermometer, liquid glass thermometers, pressure thermometer, resistance thermometer, thermistor, and thermocouple and the like. They are widely used in industry, agriculture, commerce and other departments. In daily life, people often use these thermometers.
2, non-contact
its sensing elements do not contact the measured object, also known as non-contact Thermometer. This type of meter used to measure the moving object, a small thermal capacity and small targets or rapid temperature variations (transients) of the object surface temperature, the temperature field can also be used to measure the distribution.
Advantage of the non-contact temperature sensor is to measure the temperature upper limit is not a sense of the degree of limitation of the temperature element, and thus there is no limit on the maximum temperature can be measured principle.
Temperature sensor selection Note:
1, environmental conditions, the measured object whether there is damage to the element temperature.
2, the measured temperature of the object is to be recorded, alarms and automatic control, the need for distance measurement and transmission.
3, in the case the measured temperature of the object changes with time, temperature hysteresis element can adapt to temperature requirements.
4, the size of the temperature range and accuracy requirements.
5, the size of the temperature measuring element is appropriate.