How do you use an NTC temperature probe?
Release Date:
2022-02-28
Author:
NTC temperature probe Typically, it is a conventional temperature sensor consisting of an NTC thermistor, a probe (with a metal or plastic housing, among others), an extension lead, and metal terminals or connectors. Its main feature is that, within its operating temperature range, the temperature–voltage relationship is linear. This enables secondary‑development designs for temperature measurement and control circuits to perform temperature sensing or regulation without requiring nonlinearity correction.
NTC temperature probe They typically consist of 2–3 metal oxides, blended into a clay-like slurry and sintered at high temperatures to produce dense ceramics. Their dimensions are highly customizable, with diameters not exceeding 0.010 inches, and they are widely used across numerous industries.
What is the principle behind an NTC temperature probe?
The principle of an NTC temperature sensor is based on the NTC thermistor: under a specified measurement power, its resistance decreases rapidly as temperature rises. By leveraging this characteristic, the resistance of the NTC thermistor can be measured, enabling temperature sensing and control.
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 conduction mechanisms are entirely analogous to those of semiconductors like germanium and silicon. At low temperatures, these oxide materials possess high resistivity due to the limited number of charge carriers—electrons and holes. As the temperature rises, the carrier concentration increases, leading to a decrease in resistance. At room temperature, NTC thermistors typically have resistance values ranging from 100 to 1,000,000 ohms, with temperature coefficients between −2% and −6.5%.
How do you use an NTC temperature probe?
Under constant-current conditions with an NTC temperature sensor, perform two- or three-point measurements according to the temperature range to verify interchangeability, linearity, and the temperature coefficient. Typically, a straightforward verification method involves checking the reference voltage. All electrical parameters are provided in the accompanying parameter sheet (certificate of conformity) supplied upon delivery, which details the specific performance characteristics for that sensor batch.
NTC temperature probe The test conditions are as follows:
Constant current source: 100 A, 0.5%;
Isothermal temperature field: Fluctuation: 0.05;
Test equipment: 4½- or 5½-digit digital voltmeter.
A sensor is the sensing device that enables an NTC temperature probe to acquire measurement data. The detected information—such as ambient temperature—is converted by the temperature sensor into electrical signals or other required forms, thereby meeting the needs of signal conditioning, processing, storage, display, recording, and control. Sensors come in a wide variety of types and can, in principle, be classified into three major categories: physical quantities, chemical quantities, and biological quantities, each of which further encompasses numerous subcategories. In practical applications, sensors are now ubiquitous across many fields, including industrial manufacturing, space exploration, marine research, environmental protection, resource assessment, medical diagnostics, bioengineering, and even cultural heritage preservation.
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