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Views: 0 Author: Site Editor Publish Time: 2022-08-10 Origin: Site
The PT100 temperature sensor is an instrument that converts a temperature variable into a transmittable, standardized output signal. Mainly used for the measurement and control of industrial process temperature parameters.
What is the significance of the PT100 temperature sensor?
What are the components of PT100 temperature sensor?
What is the reason why the PT100 temperature sensor adopts the three-wire connection method?
Temperature is one of the physical parameters that humans interact with the most in nature. Whether it is in a production experiment site or in a residential and leisure place, the collection or control of temperature is very frequent and important. Moreover, the networked remote collection of temperature and alarm is a modern technology. an inevitable trend of development. Since the temperature is closely related to the physical quantity itself and the actual people's life, the temperature sensor will be generated accordingly.
Due to the appearance of the PT100 temperature sensor, the relationship between the temperature and the resistance value has been realized. People took advantage of this feature to invent and produce the PT100 temperature sensor. The temperature collection range can be -200℃～+600℃.
If the PT100 temperature sensor consists of two sensors used to measure the temperature difference, there is a given continuous function relationship between the output signal and the temperature difference. There is a given continuous function relationship (usually a linear function) between the output signal of the PT100 temperature sensor and the temperature variable. The output signal of the early PT100 temperature sensor has a linear function relationship with the resistance value (or voltage value) of the temperature sensor. . The standardized output signals are mainly DC signals of 0mA~10mA and 4mA~20mA (or 1V~5V).
The resistance value of PT100 temperature sensor is 100Ω at 0℃, and the resistance change rate is 0.3851Ω/℃. Due to its small resistance and high sensitivity, the resistance of the lead cannot be ignored. The three-wire connection method can eliminate the measurement error caused by the resistance of the lead. The principle is as follows:
The cross-sectional area and length of the three wires drawn by the PT100 temperature sensor are the same (ie r1=r2=r3). The circuit for measuring platinum resistance is generally an unbalanced bridge. The platinum resistance (Rpt100) is used as a bridge arm resistance of the bridge. One (r1) is connected to the power supply end of the bridge, and the other two (r2, r3) are respectively connected to the bridge arm where the platinum resistor is located and the bridge arm adjacent to it, so that both bridge arms introduce the same resistance value. Lead resistance, the bridge is in equilibrium, and changes in lead wire resistance have no effect on the measurement results.
T Sensor Tech persists in innovation and the recent 3 years' R&D input increasing rate is above 60%. We are doing our best to be a more professional, more reliable and temperature sensor manufacturer.
