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.
The development of the NTC thermistor has gone through a long period of time, and in 1934 scientists first discovered the negative temperature coefficient of silver sulfide. In 1930, scientists found that cuprous oxide-copper oxide also had a negative temperature coefficient and The success of the use of aircraft equipment in the temperature compensation circuit.Then, due to the continuous development of transistor technology, thermistor research made significant progress .In 1960 developed a NTC thermistor .NTC thermistor widely used In temperature measurement, temperature control, temperature compensation, etc. The following describes a temperature measurement application examples.
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.
Micro NTC Thermistor is made of NTC chip, epoxy resin and lead wire. Wire material changeable according to requirement.Usual will be 28~32 AWG wire and PVC, PTFE, or enamel insulation material.
Brand:J.P.Sensor
Original place: Hefei, Anhui, China
Product features:
Epoxy encapsulated, miniature designed, high precision, quick response and good stability.
Technique parameter:
| Customized B value |
B value among 3000~4500k and R25ºC among 0.5kΩ~200kΩ can be custom designed. |
| Dissipationconstan |
in still air approx.2.1 |
| Thermal time constan(s) |
in still air ≤25 |
| Operating temperature range |
-40ºC~150ºC |
Application:
Battery pack, temperature thermometer, electronic calendar, thermometer, temperature instrument etc.
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