Different shapes and General Characteristics of Frequently used NTC thermistors

Different shapes and General Characteristics of Frequently used NTC thermistors

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On: 15 Jun, 2017

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NTC thermistors are manufactured by mixing and sintering doped oxides of metals such as nickel, cobalt, manganese, iron, aniI copper. The process is carried out in a controlled environment, and during the process the...

NTC thermistors are manufactured by mixing and sintering doped oxides of metals such as nickel, cobalt, manganese, iron, aniI copper. The process is carried out in a controlled environment, and during the process they are shaped in the desired form and size. The relative proportions of different oxides determines the resistance and temperature coefficients. The particular action of each of them can be found in [61. For high temperatures (>1000°C) yttrium and zirconium are used.


Switching PTCs are based on barium titanate to which lead or zirconium titanates are added to trim the switching temperature. There are models available from — 100°C to + 250°C. PTC thermistors for measurement are based on doped silicon.


NTC thermistors are available in multiple forms, each suited to a given application. Figure 2.16 shows a variety of units available. Probe, foil, and bead units are suitable for temperature measurement. Disks, washer, and rod units are intended for temperature compensation and control, and for self-heating applications. Table 2.4 lists some parameters of ordinary NTC thermistors.


A first category of thermistor applications comprises those based on external heating of the thermistor, as used in temperature measurement, control, and compensation. A second classification comprises those based on a deliberate heating of the thermistor by means of the measurement circuit. This second group includes measurements of flow, level, vacuum (Pirani method), and gas composition analysis. In all these situations there is a change in the thermal conductivity of the environment surrounding the thermistor. This second group also includes automatic volume and power cont rol, time delay applications, and transient suppression.


We will give a brief description of some applications suggested in [7j. Many others can be found in [61, which also gives a complete list of thermistors manufacturers, whose technical documentation usually includes some very useful ideas for different applications.

 

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