What is the function of an NTC temperature probe?
Release Date:
2022-02-20
Author:
NTC temperature probe It is a thermistor with an extended lead wire for the housing, and sometimes a finished thermistor assembly (a combination) comprising connectors is also used.
The NTC temperature probe utilizes an NTC thermistor; under a specified measurement power, its resistance decreases rapidly as temperature rises. By leveraging this feature, the resistance of the NTC thermistor can be measured, enabling temperature sensing and control.
NTC temperature probe What is the application like?
1. On household appliances such as air conditioners, refrigerators, freezers, water heaters, water dispensers, space heaters, dishwashers, disinfection cabinets, washing machines, and dryers.
2 Automotive air conditioning, water temperature sensor, intake air temperature sensor, engine.
3 Switch-mode power supplies, UPS uninterruptible power supplies, inverters, electric boilers, and the like.
4 Smart toilets, electric blankets, etc.
What is the function of an NTC temperature probe?
1. High sensitivity and fast response speed.
2. Accuracy, consistency, and compatibility of resistance and B-value
3. It employs a double-layer encapsulation process, providing insulating sealing as well as mechanical protection against impact and bending.
4. The structure is simple and flexible, and can be customized to meet customers’ varying tracking requirements.
NTC temperature probe They typically consist of 2–3 metal oxides, mixed into a clay‑like slurry and then sintered at high temperatures to form a dense ceramic. Oxygen‑bonded metals often supply free electrons. Ceramics are generally excellent insulators; however, in theory, this behavior occurs only when the temperature approaches absolute zero. As the temperature rises into more typical ranges, thermal excitation can release an increasing number of free electrons. With many of these electrons flowing through the ceramic, the effective resistance decreases. The resistance is highly sensitive to temperature changes, with a typical variation ranging from –7% to –3% per degree Celsius. Consequently, sensors designed for use over wide temperature ranges tend to be quite sensitive.
The rated room‑temperature resistance depends on the resistivity of the base material, as well as the component’s dimensions and geometry, and on the contact area of the electrodes. Thick, narrow thermistors exhibit relatively high resistance, whereas thin, wide configurations have lower resistance. Physical dimensions are highly versatile, with diameters that can be reduced to below 0.010 inches. There are virtually no size constraints, though components typically do not exceed 0.5 inches in diameter.
What is the operating principle of an NTC temperature probe thermistor?
Negative temperature coefficient thermistors are manufactured using ceramic processes and rely on metal oxides such as manganese, cobalt, nickel, and copper as their primary materials. These metal oxide materials exhibit semiconductor behavior, as their electrical conduction mechanisms are entirely analogous to those of semiconductors like germanium and silicon. At low temperatures, these oxide materials have relatively high resistances because the number of charge carriers—electrons and holes—is small. As the temperature rises, the carrier concentration increases, leading to a decrease in resistance. At room temperature, NTC thermistors typically span a resistance range from 100 to 1,000,000 ohms, with temperature coefficients ranging from −2% to −6.5%.
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