Specification:
NTC (Negative Temperature CoeffiCient) refers to the thermistor phenomenon with negative temperature coefficient, which is exponentially related to the temperature rise resistance. The material is made of manganese, copper, silicon, cobalt, iron, nickel and zinc. Or two or more metal oxides can be made into a thermistor with a negative temperature coefficient (NTC), and its resistivity and material constant are proportioned with the material composition, and the sintered Atmosphere, sintering temperature and structural state of the different changes.There are also appeared to silicon carbide, tin selenide, tantalum nitride as the representative of the non-oxide system NTC thermistor material.
NTC thermal semiconductors are mostly spinel structure or other structure of the oxide ceramic, with a negative temperature coefficient, the resistance value can be approximated as:
Rt = RT * EXP (Bn * (1 / T-1 / T0)
Where RT and RT0 are the resistance values at temperature T and T0, and Bn is the material constant, and the ceramic grain itself changes due to the temperature change, which is determined by the semiconductor properties.
Its measurement range is generally -10 ~ +300 ºC, can also be done -200 ~ +10 ºC, and even can be used for +300 ~ +1200 ºC environment for temperature measurement. RT is NTC thermistor; R2 and R3 is the bridge balance resistance; R1 is the starting resistance; R4 is the full scale resistance, the calibration table, also known as the check resistance; R7, R8 and W for the voltage divider, for the bridge to provide a stable DC power supply. R6 is connected in series with the meter head (microampere table), which corrects the scale of the scale and limits the current flowing through the head. R5 is in parallel with the head and protects the unbalanced bridge arm (ie, R1, RT) Into a thermal element RT for the temperature sensor probe.As the thermistor resistance changes with the temperature changes, so that the bridge between the diagonal line between the instructions also change accordingly. This is the thermal The working principle of the resistor thermometer.
Thermistor thermometer accuracy can reach 0.1 ºC, temperature time can be as little as 10s. It is not only suitable for granary thermometer, but also can be used in food storage, medicine and health, scientific farming, marine, deep wells, Glaciers and other aspects of temperature measurement.
Feature: good stability, good temperature-resistance, fast response etc.
Application: household appliance, temperature measuring, industrial field, automobile etc.
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