What Is A Pt100 Sensor?

What Is A PT100 Sensor?

PT 100 temperature sensors are the most common type of platinum resistance thermometer. Often resistance thermometers are generally called Pt100 sensors, even though in reality they may not be the RTD Pt100 type. Pt refers to that the sensor is made from Platinum (Pt). 100 refers to that at 0°C the sensor has a resistance of 100 ohms (Ω).

A resistance thermometer is a type of temperature sensor. It consists of an element that uses resistance to measure temperature. Common names for Resistance Thermometers include RTDs (short for resistance temperature detector), RT, Pt100 RTD, or Pt1000.

How Does A PT100 Sensor Work?

RTD PT100 temperature sensors operate based on the principle that the electrical resistance of platinum changes predictably with temperature variations. As temperature increases, the resistance of the platinum element also increases. This change in resistance is measured accurately and converted into temperature readings using appropriate algorithms or conversion tables.

How To Calibrate A PT100 Sensor?

Calibrating a PT100 sensor involves comparing its output against a known standard over a range of temperatures. This process typically requires specialised equipment such as temperature baths or ovens to generate precise temperature conditions. The sensor’s readings are then compared against the reference standards, and adjustments are made if necessary to ensure accurate temperature measurement across the desired range.

How To Check PT100 Sensor With Multimeter?

To check a PT100 sensor with a multimeter, you can follow these steps:

1. Set the multimeter to measure resistance (ohms).
2. Disconnect the PT100 sensor from any circuitry or power source.
3. Connect the multimeter leads to the terminals of the PT100 sensor.
4. Read the resistance value displayed on the multimeter.
5. Compare the measured resistance value with the expected resistance at a known temperature using PT100 tables or conversion formulas.

How To Test A PT100 Temperature Sensor?

Testing a PT100 temperature sensor involves verifying its accuracy and functionality across a range of temperatures. This can be done by subjecting the sensor to known temperature conditions and comparing its readings against a calibrated reference thermometer or temperature measurement device. Additionally, testing for linearity and hysteresis can also be performed to ensure consistent and reliable performance.

Which Is Better PT100 Or PT1000?

The choice between PT100 and PT1000 depends on the specific application requirements. PT1000 sensors have a higher nominal resistance (1000 ohms at 0°C) compared to PT100 sensors (100 ohms at 0°C), making them less susceptible to lead resistance effects. PT1000 sensors also typically offer higher resolution and are more suitable for applications where long cable lengths are involved. However, PT100 sensors are more commonly used in industrial applications due to their standardized calibration and wider availability.

What Is The Difference Between RTD And PT100?

RTD (Resistance Temperature Detector) is a general term encompassing temperature sensors that operate based on the principle of resistance change with temperature. PT100 is a specific type of RTD that uses platinum as the sensing element with a nominal resistance of 100 ohms at 0°C. Therefore, the primary difference lies in the material used for the sensing element, with PT100 specifically referring to platinum-based RTDs.


In conclusion, PT100 sensors are critical components in temperature measurement systems, offering high accuracy, stability, and reliability across a wide range of applications. Understanding their operation, calibration procedures, and differences from other temperature sensors such as PT1000 and RTDs is essential for ensuring accurate temperature measurement and maintaining process efficiency in various industries. By following proper calibration and testing procedures, PT100 sensors can provide dependable temperature data vital for industrial processes, research, and quality control applications.

If you want to order a temperature sensor or you are unsure exactly what you need, get in touch and we can help you.

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