)
What to consider when choosing a temperature sensor
Here’s how Fagerberg improves the everyday for the process industry.
Which temperature sensor is right for your process? This depends on the temperature range, the properties of the medium and your measurement requirements.
Here, we guide you through the key factors to consider and provide an overview of different types of temperature instruments and where they are best suited.
1. Start with your measurement needs
Do you need to measure temperature continuously, read it locally or transmit the measured value to a control system? Pt100 sensors and thermocouples are used for continuous measurement, while mechanical thermometers provide local readings directly at the process.
2. What temperature range do you need to measure?
The temperature range is an important factor when choosing a measurement principle. Pt100 sensors are often used when high accuracy and stability are important, while thermocouples are an option for high temperatures and demanding environments. The sensor design and materials also determine which temperatures it can withstand.
3. How quickly do you need to measure temperature changes?
When temperatures change rapidly, the sensor's response time can be critical. This depends on factors such as the design and dimensions of the sensing element and its contact with the medium. A smaller sensor may provide a faster response, but mechanical strength and process conditions must also be considered.
4. How accurate does your measurement need to be?
Requirements vary depending on whether the measurement is used for basic temperature monitoring, process control or accurate energy measurement. The sensor's tolerance class, installation and signal transmission all affect the measurement result. The required accuracy should therefore be based on how the temperature measurement will be used.
5. Consider installation and process conditions
Insertion length, sensor positioning and heat transfer between the medium and the sensor are important for accurate measurement. Thermowells can protect the sensor and make replacement easier, but they also affect response time. High pressures, corrosive media and vibration may require specific materials and designs.
6. Which type of temperature instrument is right for your application?
A brief overview of our different product categories.
Thermocouples
Measure temperature through the electrical voltage generated between two different conductor materials. Suitable for high temperatures, strong vibrations, rapid temperature changes and demanding industrial environments.
Thermometers
Provide a local temperature reading without the need to transmit the measured value to a control system. We offer both gas-filled and bimetal thermometers in different designs, including models with capillary tubes for remote reading away from the measurement point.
Pt100 temperature sensors
Resistance temperature sensors in which electrical resistance changes with temperature. Suitable for accurate and stable temperature measurement across a wide temperature range and used in many industrial processes.
The most suitable solution depends on the temperature range, your process conditions and how the measurement will be used.