Thermistors: An Introduction to Temperature Measurement
What is a thermistor? A thermistor is a temperature-sensing 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
Benefits of Using a Thermistor Accuracy
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 Thermistor
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 non-linear, the instrument used to read the temperature must linearize the reading.
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.