Temperature probes – find manufacturers and suppliers

Temperature sensors are electrical or electronic components used to measure temperature in a variety of environments and applications.

They are essential in many industries and household appliances as they provide accurate temperature measurements that are necessary to control, monitor or regulate processes. There are different types of temperature sensors, which vary depending on the technology and application.

Below you will find the respective types and how they work, as well as the specific areas of application of different temperature sensors and the areas in which they are used:

Types and functionality of temperature sensors:

The functioning of temperature sensors is based on various physical principles, which differ depending on the sensor type.

Here are the most common types of temperature sensors and how they work:

1. Thermocouples:
   A thermocouple consists of two different metals joined at one end.
   When this connection is heated or cooled, a voltage (thermoelectric voltage) is generated that is directly proportional to the temperature difference between the two ends.
   Use: Thermocouples are widely used in industrial processes where high temperatures need to be measured, such as in metal processing or in furnaces.
   Advantages: They are robust, have a wide temperature measuring range (-200°C to +1800°C) and react quickly to temperature changes.
2. Resistance thermometers (RTD):
   RTD sensors, especially platinum RTDs (e.g. Pt100), utilize the fact that the electrical resistance of a metal changes with temperature.
   The change in resistance of the sensor is proportional to the temperature.
   Use: RTDs are often used in industrial applications that require high measurement accuracy and stability over long periods of time, such as in the chemical industry or in laboratory environments.
   Advantages: They provide very accurate and stable temperature measurement over a moderate temperature range (-200°C to +600°C).
3. Thermistors:
   Thermistors are temperature-dependent resistors in which the resistance decreases with either increasing (NTC - Negative Temperature Coefficient) or decreasing (PTC - Positive Temperature Coefficient) temperature.
   Application: They are used in applications that require a rapid response to temperature changes, e.g. in household appliances (e.g. air conditioning systems, refrigerators) and medical devices.
   Advantages: Thermistors are cost-effective, offer a fast response time and are ideal for applications with a limited temperature range.
4. Infrared temperature sensors:
   Infrared sensors measure the infrared radiation emitted by objects, which is proportional to the temperature of the object.
   They do not touch the object, but detect the temperature from a distance.
   Application: These sensors are often used in areas where non-contact measurement is required, e.g. in food processing, moving parts or extremely hot environments (e.g. melting furnaces).
   Advantages: They enable contactless measurement, are ideal for extreme temperatures and offer fast response times.
5. Semiconductor temperature sensors:
   These sensors use semiconductor devices (such as diodes or transistors) whose electrical properties (e.g. voltage or resistance) change with temperature.
   This change is measured and converted into a temperature.
   Application: Semiconductor sensors are often used in electronics and consumer products, e.g. to monitor the temperature in computers or cell phones.
   Advantages: They are inexpensive, small and easy to integrate into electronic systems.

Use of temperature sensors:

Temperature sensors have a variety of uses in industrial, household, medical and scientific applications. Here are some of the most common applications:

1. Industry:
In the manufacturing and processing of materials, such as in the steel, chemical or plastics industries, temperature sensors monitor processes to ensure that the temperature remains within desired ranges.

2. Heating, ventilation and air conditioning (HVAC):
Temperature sensors control heating and cooling systems in buildings to ensure a comfortable indoor climate.

3. Household appliances:
Temperature sensors are used in ovens, microwaves and refrigerators to control the correct temperatures for cooking, cooling and freezing.
Temperature sensors ensure optimum water temperatures and drying cycles. in washing machines and dryers.

4. Automotive industry:
Temperature sensors measure engine temperature and optimize the combustion process to ensure efficiency and safety.
In electric vehicles, the temperature of batteries is monitored to prevent overheating.

5. Medicine and healthcare:
Temperature sensors are used in devices such as ventilators or thermometers to monitor the health status of patients.
In medical autoclaves, the temperature is monitored to ensure that instruments are sterilized correctly.

6. Science and research:
Temperature sensors are essential for accurate temperature measurements in chemical reactions or physical experiments.
Temperature sensors are used to measure air and water temperature in meteorology and oceanography.

Temperature sensors are versatile sensors that are used to measure and monitor temperature in various applications. They function using different physical principles, such as voltage changes, resistance changes or infrared radiation. Choosing the right temperature sensor depends on the specific requirements of the application, such as measurement accuracy, temperature range, response speed and environmental conditions.

Here are the most important criteria to consider when buying temperature sensors:

When purchasing temperature sensors, there are several important aspects to consider to ensure that the sensors are suitable for the specific application.

• Choosing the right type of sensor depends on the application and specific requirements:
• Thermocouples: Well suited for high temperature applications, such as furnaces or foundries. They are robust and have a wide temperature range.
• Resistance thermometers (RTD): Ideal for precise and stable measurements in moderate temperature ranges. Often used in the chemical industry or in laboratories.
• Thermistors: Fast-response sensors for smaller temperature ranges, often in household appliances.
• Infrared temperature sensors: For non-contact measurements, e.g. for hot or moving objects.
• Semiconductor sensors: Ideal for electronics and low-cost applications where integrated temperature monitoring is required.
• The temperature sensor should be able to cover the entire temperature range of your application:
• Extremely high temperatures: thermocouples (up to 1800°C) are the best choice here.
• Moderate temperatures: Resistance thermometers (RTDs) and thermistors are well suited for temperature ranges up to about 600°C and 150°C respectively.
• Non-contact measurement: Infrared sensors are suitable for applications where extreme temperatures prevail or contact is not possible.
• Depending on the application, high accuracy is required:
• RTD sensors offer the highest accuracy (up to ±0.1°C), making them ideal for precision applications.
• Thermocouples are less accurate (±1°C to ±2°C) but sufficient for high temperature measurements.
• Thermistors are also accurate, but only in a smaller temperature range.
• The response time indicates how quickly the sensor reacts to temperature changes:
• Thermistors and thermocouples generally offer faster response times than RTDs, which is important in dynamic processes.
• Infrared sensors have an extremely fast response time as they are non-contact.
• Consider the conditions under which the temperature sensor will operate:
• The sensor should have a high protection class (e.g. IP65 or higher) if it will be used in humid environments.
• In corrosive environments or when measuring aggressive media, the sensor should be made of resistant materials (e.g. stainless steel, PTFE coating).
• In industrial applications, the sensor often has to withstand mechanical loads.
• Make sure that the temperature sensor provides the correct output signal for your control or monitoring systems:
• Analog signals (e.g. 4-20 mA, 0-10 V): Common in industrial applications.
• Digital signals (e.g. Modbus, I2C, SPI): Ideal for modern automation systems or IoT applications.
• Consider how the temperature sensor should be installed:
• Immersion sensor: For liquids or gases.
• Surface sensor: For measuring solid temperatures.
• Infrared sensor: For non-contact measurement of surface temperatures.
• A high-quality sensor should be calibratable to ensure long-term accurate measurements:
• Some applications (e.g. in the pharmaceutical or food industry) require sensors with calibration certificates.
• Easy calibration and low maintenance requirements are an advantage.
• Depending on the application and budget, price can be a decisive factor:
• Thermistors and semiconductor sensors are generally less expensive.
• RTDs and thermocouples are more expensive, but offer higher precision and temperature ranges.

By considering these points, you can choose the right temperature sensor for your application and achieve optimum measurement performance.

Temperature sensors can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Temperature sensors from all over the world can be found on Exportpages.