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When it comes to NTC thermistors and sensors, we have to mention NTC thermistor probe. This small electronic component plays a huge role in sensor applications and is also widely used in automative innovation, medical technology, and home appliances.
Also known as bead thermistors, thermistor probes are manufactured as bare beads, encapsulated with epoxy or glass, usually enclosed in a metal or plastic housing, and have two high-temperature insulated wires.
From HVAC/R and environmental control to automobiles and home appliances, thermistor probes and assemblies are used for temperature sensing in a variety of industries. This article will take a closer look at the classification, applications, benefits and why thermistor probes are indispensable.
What is NTC Thermistor Probe
NTC stands for “Negative Temperature Coefficient”, NTC thermistors are resistors with a negative temperature coefficient, which means that the resistance decreases as the temperature increases.
An NTC temperature probe is a semiconductor-based device, commonly used in ntc thermistors and sensors, that measures temperature by measuring the resistance of the current flowing through it.
What are main types of NTC Thermistor Probe
Probes are devices used to measure the temperature of solids, liquids, or gases. They come in many forms and with unique functions and capabilities.
Surface NTC Probes/Assemblies
Surface temperature sensing thermistors operate over a wide temperature range and can be used to monitor surface temperature in a variety of applications, including air conditioners, heat pumps, water heaters, audio amplifiers, component monitoring, and consumer appliances.
Besonderheit
- Fast thermal response
- Precise thermal tracking
- Excellent long-term stability
- Moisture resistant
Gas NTC Probes/Assemblies
The gas probe has a compact design and is the ideal solution for applications with low to medium dust levels during gas sampling. The gas probe operates with a holding temperature of up to 200°C and comes with a single-stage back-purge and calibration port as standard.
Besonderheit
- Temperature and pressure compensation
- Typical heat sterilization temperature 180 °C (up to 190 °C)
- Long service life
- Humidity compensation
Brass Threaded Thermistor Probes/Assemblies
Threaded thermistor probe assemblies are rugged devices that operate up to 150°C. With a variety of thread options and styles and probe housing materials, these thermistor probes can be used in industries such as industrial electronics and controls, pool/spa, and building automation.
Besonderheit
- Moisture resistant
- XLPE insulated wire
- Maximum operating temperature 150°C
Level NTC Probes/Assemblies
Liquid level NTC probes/assemblies are submersible probes for level and fill measurement. These probes are specially designed and use cables and housing materials that are compatible with the surrounding environment and can be used for a wide range of liquids.
Besonderheit
- No mechanical movement, long life
- Simple circuit structure, also measures water temperature
- Fast response time
- Equipped with moisture-proof coating housing
Flanged Thermistor Probes/Assemblies
Thermistor probes are available with flanges for many industries including HVAC and Building Automation. These “easy to install” configurations include square, round and rectangular flanges.
Besonderheit
- Measures the temperature of air, water, oil or solid surfaces
- With rectangular flange and mounting holes
- Reliable operation in hot, humid and greasy air
- Wide measuring range from -40°C to 300°C
How NTC thermistor probes are essential in applications
NTC thermistor probes are used in a variety of industries. But despite the wide variety of thermistor sizes and shapes, it is impossible to make a universal thermistor probe. Just like the type of thermistor used to measure coolant temperature in a car is very different from the type of thermistor used to measure the temperature of a wind turbine. Next, this article will introduce each one according to different application scenarios.
How NCT Thermistor Probes Are Applied in Automative Innovation
Engineers rely on thermistor probes as a design consideration for any product that generates heat or cold and requires temperature measurement, control, and accuracy. Without them, many cars, appliances, industrial equipment, and basically anything that requires electricity would not function properly. The following table shows the number of thermistors required for cars of different eras:
| 1966 | 2 thermistors/car |
| 1970s | 15 thermistors/car |
| 1980s | 40 thermistors/car |
| 1990s | 60 thermistors/car |
Today, cars use between 80 and 100 thermistors. As automotive technology increases and improves, so does the need for temperature sensors. Car seat heaters, air conditioners, window defrosters, and oil temperature gauges all require sensing, regulation, and temperature control.
In addition, more functions and processes require sensing to improve vehicle performance, driver convenience, automotive safety, and reduce or control emissions. Today’s cars exhibit more artificial intelligence, and part of that is the need to sense and regulate temperature.
To learn more about the application of thermistors in smart cars, you can read The Role And Function of Thermistors in Electric Vehicles.
How NTC Thermistor Probes Are Applied In Medical Technology
Green energy is one area where thermistor probe applications have made great progress. While in the past, traditional open circuits would damage the turbine’s rotor and generator windings through short-circuit currents, it is now safer and more economical to use NTC thermistors in open circuits. NTC probes are also able to measure blade temperature in cold environments. When wind turbine blades freeze, the turbine becomes less efficient and may not operate. NTC probes transmit temperature information to the wind turbine’s heater, allowing the turbine to compensate for cold temperatures and prevent blade ice from forming.
NTC thermistors can also measure water temperature to analyze rising global temperatures. With accurate, reliable, and stable data detection, environmental scientists can determine how quickly oceans and lakes are warming. NTC thermistors are another excellent choice for this application because they are able to maintain their accuracy over long periods of time, reducing the possibility of interruptions in data collection and skewing results.
How NTC Thermistor Probes Are Applied In Everyday Applications
Thermistor probes are also ubiquitous in everyday life. NTC thermistors are found in almost every appliance, from refrigerators to portable heaters. From a preventive perspective, thermistors reduce the likelihood that an appliance like a microwave or portable heater will overheat and catch fire. The same is true for these electronic components in other appliances such as computers, air conditioners, and fire alarms.
How to Select and Integrate NTC Thermistor Probes into Different Applications
Different thermistor probes correspond to different application areas. Some measure air temperature, while others monitor liquids or solid substances. So, how do you see which one is right for your application?
Features to Consider
There are a few features that can help you choose the best type of temperature probe for your application.
- Genauigkeit
- Operating Environment
- Temperaturbereich
- Ansprechzeit
- Response Range
- Cost
Weighing these factors will help you choose the right type of sensor for your needs. For more detailed information, please read How to choose the right NTC thermistor.
Probe Housings Customizable to Specific Application Parameters
Metal or plastic assembly housings cover thermistor beads for different applications and functions. These probes come in a variety of shapes, sizes, and mounting options.
Some NTC thermistor probes are long and narrow with stainless steel housings and are used in vehicles to measure oil or water temperatures.
Other temperature sensing probes integrate threaded tubes used in engines or medical devices to detect and monitor temperature.
Probes with ring lug designs are often used with heat sinks or lithium-ion batteries.
Each thermistor temperature sensor starts as a tiny chip connected to two thermally insulated wires. Meanwhile, thermally conductive epoxy fills the remaining space within the housing. Probes can also be further customized to the precise requirements of their application. When used in applications such as lithium-ion batteries, NTC probes with ring lugs can be easily and securely mounted to the battery terminals. .
Abschluss
NTC thermistor probe is a small component on thermistors and sensors, but it plays an important role in a wide range of fields. Through this article, the definition, main types and application scope of probes are explained.
DTTTEK provides the main types of thermistor probe products on the market. Whether you are an experienced importer or a novice, our team is ready to help you find the NTC thermistor probe that meets your needs.
If you have any questions or concerns about purchasing thermistor probes, please feel free to contact us at sales@dtttek.com. Our professional team is committed to providing free sensor consulting services to ensure that your needs are guided and supported by experts.
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