Quantum Instruments And Solutions
Quantum Instruments And Solutions
Perungudi, Chennai, Tamil Nadu
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Thermistor

Leading Manufacturer of ntc 22d-15 thermistor and ptc c860 thermistor from Chennai.

NTC 22D-15 Thermistor

NTC 22D-15 Thermistor
  • NTC 22D-15 Thermistor
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Product Details:

Part No22D15
Operating Temperature Range-50~+200
Thermistor MountingDisc Type
Surface FinishEpoxy Coated
Resistance Tolerance20
Diameter15 mm
Wire ConnectionThrough Hole

NTC Thermistor is a special type of resistor whose value changes in accordance with its surrounding temperature. It is made by combining several metal oxides. This is an NTC (Negative Temperature Coefficient) type thermistor. Hence as the temperature increases then the resistance of the thermistor decreases and vice versa.
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PTC C860 Thermistor

PTC C860 Thermistor
  • PTC C860 Thermistor
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Product Details:

Part NoC860
Operating Temperature Range-40 degree C to 85 degree C
Thermistor MountingDisc Type
Surface FinishEpoxy Coated
Resistance Tolerance+/-25%
Thermal Time Constant14s
Wire ConnectionThrough Hole

Most PTC thermistors are of the "switching" type, which means that their resistance rises suddenly at a certain critical temperature. The devices are made of a doped polycrystalline ceramiccontaining barium titanate (BaTiO3) and other compounds. The dielectric constant of this ferroelectric material varies with temperature. Below the Curie point temperature, the high dielectric constant prevents the formation of potential barriers between the crystal grains, leading to a low resistance. In this region the device has a small negative temperature coefficient. At the Curie point temperature, the dielectric constant drops sufficiently to allow the formation of potential barriers at the grain boundaries, and the resistance increases sharply. At even higher temperatures, the material reverts to NTC behaviour. The equations used for modeling this behaviour were derived by W. Heywang and G. H. Jonker in the 1960s.

Another type of PTC thermistor is the polymer PTC, which is sold under brand names such as "Polyswitch" "Semifuse", and "Multifuse". This consists of a slice of plastic with carbon grains embedded in it. When the plastic is cool, the carbon grains are all in contact with each other, forming a conductive path through the device. When the plastic heats up, it expands, forcing the carbon grains apart, and causing the resistance of the device to rise rapidly. Like the BaTiO3 thermistor, this device has a highly nonlinear resistance/temperature response and is used for switching, not for proportional temperature measurement.

Yet another type of thermistor is a silistor, a thermally sensitive silicon resistor. Silistors employ silicon as the semiconductive component material. In contrary to the "switching" type thermistor, silistors have an almost linear resistance-temperature characteristic.

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Quantum Instruments And Solutions
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