What is the typical temperature range for a platinum RTD sensor?
Generally speaking, the measurement range of a conventional platinum resistance thermometer (RTD) sensor is -50°C to 260°C. We can contact the supplier to customize a calibration to meet their operating temperature requirements.
What does Pt100 stand for?
PT100 is a platinum RTD. Its resistance changes with temperature. The 100 after PT means that its resistance is 100 ohms at 0°C. And approximately 138.5 Ω is 100°C.
What is the calibration of a platinum resistance thermometer?
Based on Sino-Inst’s years of experience in the measurement instrumentation field, we have summarized the following platinum resistance thermometer calibration methods for your reference. Platinum resistance thermometer calibration involves the following steps:
First, fluctuations in parameters such as humidity and pressure should be kept within standard ranges as much as possible. So, we must ensure a stable calibration environment to prevent fluctuations from affecting the calibration results.
The most fundamental calibration principle is to select a set of standard reference temperatures (low temperature, high temperature, and ambient temperature) of known precision and compare them with the device being calibrated. The following are some specific calibration methods:
Standard Platinum Resistance Thermometer: Standard Platinum Resistance Thermometers are primarily used as references. Calibration is performed by comparing the resistance difference between two Platinum Resistance Thermometers.
Thermocouple Bridge: A thermocouple bridge circuit is used to measure the resistance of the Platinum Resistance Thermometer. This resistance is then compared with the output of a standard thermocouple bridge circuit of known precision.
Thermocouple Comparison: A calibrated thermocouple is used as a standard reference. The Platinum Resistance Thermometer is connected to the thermocouple’s temperature measurement system. The resistance of the Platinum Resistance Thermometer is adjusted to match the voltage output of the thermocouple.
Digital Signal Processing: By utilizing electronic technology and digital signal processing algorithms, calibration accuracy and efficiency can be improved while reducing the impact of human error. This method is currently the most commonly used.
Why is platinum used in Pt100?
Platinum resistors are made of very fine platinum wire wound around a mica support. They are internationally recognized as high-precision temperature measurement standard sensors. Because platinum resistors maintain extremely stable physical and chemical properties in oxidizing media, even at high temperatures, they offer high precision, excellent stability, and reliable performance.
