Pt1000 is a platinum thermal resistor, and its resistance value will change with the change of temperature. The number 1000 after “Pt” indicates that its resistance value is 1000 ohms at 0°C, and its resistance value is approximately 1758.56 ohms at 200°C. The resistance value of PT1000 increases uniformly as the temperature rises. Pt100 is also a platinum thermal resistor. The number 100 after “Pt” indicates that its resistance value is 100 ohms at 0°C, and its resistance value is approximately 175.86 ohms at 200°C. Pt500 is also a platinum thermal resistor. The number 500 after “Pt” indicates that its resistance value is 500 ohms at 0°C, and its resistance value is approximately 879.30 ohms at 200°C.
Nowadays, Pt1000 is mostly used for temperature measurement in heat meters or calorimeters. Firstly, the Pt1000 graduation number is larger, resulting in higher accuracy. Secondly, the input impedance of Pt1000 is higher, and the excitation voltage can be increased, thus improving the sensitivity. Thirdly, PT1000 is suitable for measuring small-range temperature changes (the reason is that when the temperature changes by one degree, the change in resistance value is relatively large, and the subsequent circuit can easily detect it). In terms of usage, Pt1000 is also more convenient. In industrial field applications, generally, the resistance signals of Pt100 and Pt500 are converted into 4-20mA current signals, and then the signals are processed. However, Pt1000 directly measures the resistance signal.
Post time: Apr-01-2025