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GENERAL NOTES
The applications of standard PTC thermistors
can be classified in two main groups.
1. Applications where the temperature
of the PTC is primarily determined by the temperature
of the surrounding environment.
2. Applications where the temperature
of the PTC is primarily determined by the electrical power
dissipated by the device.
The first group includes applications
such as temperature measurement, temperature control,
temperature compensation and over-temperature protection.
The second group includes applications
such as over-current protection, liquid level detection,
air flow detection, time delay, constant current and constant
temperature applications.
Do not apply voltage exceeding Vmax
to the PTC device. Doing so may destroy the thermistor.
Although several PTC's may be connected in series for
temperature sensing applications, do not connect PTC thermistors
in series in order to obtain higher voltage ratings. Since
no two devices are exactly the same, one would tend to
heat faster than the others thereby limiting the current
flow through the other devices and resulting in the entire
voltage available being dropped across the single device.
PTC's may, however, be connected in
parallel to increase the current ratings in current limiting
applications. RTI Electronics's engineers specialize in
the development of state-of-the-art devices for the most
demanding applications. If you have a unique application
which requires a part not listed in this catalog, please
contact our applications engineering staff.
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