Ultrasonic Flow Meters

20+ Years Manufacturing Experience

Why is the Pt1000 temperature sensor predominantly chosen for heat measurement? What are the distinctions among Pt1000, Pt500, and Pt100?

Pt1000 is a platinum thermal resistor whose resistance value varies with temperature. The “1000″ after “Pt” means it has a resistance of 1000 ohms at 0°C and approximately 1758.56 ohms at 200°C. The resistance of PT1000 increases steadily as the temperature rises. Pt100 is also a platinum thermal resistor, with the “100″ indicating a resistance of 100 ohms at 0°C and around 175.86 ohms at 200°C. Pt500, another platinum thermal resistor, has a resistance of 500 ohms at 0°C and about 879.30 ohms at 200°C.

Currently, Pt1000 is widely used for temperature measurement in heat meters. Firstly, Pt1000 features a larger graduation, enabling higher precision. Secondly, its higher input impedance allows for an increased excitation voltage, enhancing sensitivity. Thirdly, PT1000 is ideal for measuring small temperature variations (since a one-degree temperature change leads to a relatively large resistance change, making it easier for the subsequent circuit to detect). In terms of application, Pt1000 is more user-friendly. In industrial settings, the resistance signals of Pt100 and Pt500 are usually converted into 4-20mA current signals for further processing, while Pt1000 directly measures the resistance signal.

Post time: Apr-15-2025

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