How to connect temperature sensor Pt100 universal -50…250°C

To connect a Pt100 universal temperature sensor with a range of -50°C to 250°C, follow these steps:

1. Identify the sensor leads: The Pt100 sensor will typically have three leads – two for the resistive element and one for the common connection. The two leads for the resistive element are usually labeled as “Pt” or “R” (for resistance) and the common lead as “C” or “COM.” Refer to the sensor’s datasheet or documentation to confirm the labeling.
2. Prepare the wiring: Depending on your application, you may use two, three, or four-wire connection methods. The most common methods are two-wire and three-wire configurations. For a more accurate measurement, the four-wire configuration is recommended but less commonly used.
3. Two-wire connection: In the two-wire configuration, connect one lead of the Pt100 sensor to one terminal of the measuring device (e.g., temperature controller or data acquisition system) and the other lead to the remaining terminal. This method is simple but less accurate due to the introduction of lead wire resistance.
4. Three-wire connection: The three-wire configuration compensates for the lead wire resistance, resulting in more accurate measurements. Connect one lead of the Pt100 sensor to one terminal of the measuring device. Connect the second lead to a terminal connected to the positive side of the excitation voltage. Finally, connect the common lead to a terminal connected to the negative side of the excitation voltage and the reference input of the measuring device.
5. Four-wire connection (optional): The four-wire configuration provides the most accurate measurement by eliminating lead wire resistance. Connect one pair of leads from the Pt100 sensor to the excitation voltage terminals. Connect the other pair of leads to the measurement terminals of the measuring device.
6. Check excitation voltage: Ensure that the excitation voltage provided to the Pt100 sensor matches the specifications mentioned in the datasheet or documentation. Typically, a constant current of 1 mA or 0.1 mA is used as the excitation current.
7. Temperature measurement device: Connect the measuring device, such as a temperature controller or data acquisition system, to the appropriate terminals of the Pt100 sensor. Ensure that the device is configured to measure resistance or temperature using the Pt100 sensor.
8. Calibration and testing: After the physical connections are made, it is important to calibrate the measurement system. This involves comparing the readings from the Pt100 sensor to known reference temperatures and adjusting the calibration if necessary. Perform functional tests to ensure the sensor is providing accurate and reliable temperature readings.

Remember to double-check all connections and follow the manufacturer’s instructions and guidelines provided in the sensor’s documentation. If you are unsure or lack experience with electrical connections, it is recommended to consult an expert or an engineer for assistance.