What are the characteristics of NTC temperature probes? Functional features of temperature sensors.
Release Date:
2021-12-17
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NTC temperature probe What are its characteristics? Temperature sensors are the core component of temperature measurement instruments and come in a wide variety. Based on their measurement method, they can be classified into contact-type and non-contact-type sensors.
The sensing element of a contact-type temperature sensor makes good thermal contact with the object being measured, achieving thermal equilibrium through conduction or convection, so that the thermometer’s reading directly reflects the object’s temperature.
NTC temperature probe What are its characteristics? Generally, it offers high measurement accuracy. Within a certain temperature range, the thermometer can also measure the internal temperature distribution of an object. However, for moving objects, small targets, or objects with low thermal capacity, significant measurement errors may occur.
Commonly used contact-type temperature sensors include bimetal thermometers, glass liquid thermometers, pressure thermometers, resistance thermometers, thermistors, and thermocouples.
What are the characteristics of NTC temperature probes? Non-contact temperature sensors do not make physical contact with the object being measured. They can be used to measure the surface temperature of moving objects, small targets, and objects with low thermal mass or rapid temperature changes (transient conditions), and they are also suitable for measuring the temperature distribution within a temperature field.
What are the characteristics of NTC temperature probes? The working principle of commonly used non-contact temperature sensors is radiative thermometry, which is based on the fundamental laws of blackbody radiation. Radiative thermometry encompasses the brightness method (see optical pyrometer), the radiation method (see radiation pyrometer), and the colorimetric method (see colorimetric thermometer). Each radiative temperature measurement technique can only determine the corresponding radiance temperature, radiant temperature, or colorimetric temperature. Only the temperature measured for a blackbody— an object that absorbs all radiation and reflects none—is the true temperature. However, the surface emissivity of materials depends not only on temperature and wavelength but also on surface condition, coating, and microstructure, making precise measurement extremely challenging.
Among them, infrared temperature sensors are particularly common. After an infrared sensor detects the energy emitted by an object, it uses its optical system to convert this infrared energy into an electrical signal, which is then processed to yield a temperature reading.
What are the characteristics of NTC temperature probes? Temperature sensors are among the most commonly used types of sensors. They are employed in a wide range of devices, including computers, automobiles, kitchen appliances, air conditioners, and household thermostats.
There are four common types of temperature sensors: thermocouples, thermistors, RTDs, and integrated circuit temperature sensors. Integrated circuit temperature sensors come in both analog‑output and digital‑output versions.
A thermistor is a temperature sensor made from a semiconductor. Its resistance varies with temperature, and the resistance value changes accordingly. For different materials, the change in resistance for a given temperature variation differs; thus, the resistance can be used directly as an output signal.
What are the characteristics of NTC temperature probes? Thermistors, which utilize semiconductors, exhibit a negative temperature coefficient—meaning their resistance decreases as temperature rises. Even small temperature changes can result in significant resistance variations, making them highly sensitive temperature sensors.
NTC temperature probe What are its characteristics? However, thermistors exhibit extremely poor linearity, with a highly nonlinear resistance–temperature curve. This is closely tied to the manufacturing process, which is why manufacturers cannot provide standardized thermistor curves. Thermistors are very small in size, respond rapidly to temperature changes, and are highly sensitive to self-heating errors; they offer high accuracy but require a current source, have a limited temperature‑measurement range, and are relatively expensive.
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