Notes on thermistors for GCSE double award Science, Electricity module

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What is a Thermistor?
What is a thermistor? A thermistor is a temperaturesensing element composed of
sintered semiconductor material which exhibits a large change in resistance proportional
to a small change in temperature. Thermistors usually have negative temperature
coefficients which means, the resistance of the thermistor decreases as the temperature
Benefits of Using a Thermistor
Thermistors are one of the most accurate types of temperature sensors. OMEGA
thermistors have an accuracy of ±0.1°C or ±0.2°C depending on the particular thermistor
model. However thermistors are fairly limited in their temperature range, working only over
a nominal range of 0°C to 100°C.
Finished thermistors are chemically stable and not significantly affected by aging.
Types of Thermistors
Thermistor Elements
The thermistor element is the simplest form of thermistor.
Because of their compact size, thermistor elements are
commonly used when space is very limited. OMEGA offers a
wide variety of thermistor elements which vary not only in form
factor but also in their resistance versus temperature
characteristics. Since thermistors are nonlinear, the instrument
used to read the temperature must linearize the reading.
Linear Response Thermistor Elements
For applications requiring thermistors with linear response to
temperature change, OMEGA offers linear components. These
unique devices consist of a thermistor composite for
temperature sensing and an external resistor composite for
Thermistor Probes
The standalone thermistor element is relatively fragile and can
not be placed in a rugged environment. OMEGA offers
thermistor probes which are thermistor elements embedded in
metal tubes. Thermistor probes are much more suitable for
industrial environments than thermistor elements.


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