In the process of industrial production, everyone is not unfamiliar with the pt100 degree sensor. This kind of temperature sensor is very adaptable and can be more accurate for industrial production.
The temperature during the production process is measured to facilitate further operations. This article will introduce you to the pt100 temperature sensor and its application circuit diagram
Pt100 temperature sensor is an instrument that converts temperature variables into standardized output signals that can be transmitted. Mainly used for the measurement and control of temperature parameters in industrial processes. Transmitter with sensor usually consists of two parts: sensor and signal converter. The sensor is mainly a thermocouple or thermal resistance; the signal converter is mainly composed of a measurement unit, a signal processing and conversion unit (because industrial thermal resistance and thermocouple indexing tables are standardized, the signal converter is also called as an independent product Transmitter), some transmitters increase the display unit, and some have field bus function. To
Temperature is one of the physical parameters that interact most with humans in nature. Whether in production experimental sites or residential and leisure places, temperature collection or control is very frequent and important. Moreover, networked remote temperature collection and alarming are modern technology. An inevitable trend of development, because temperature is not closely related to the physical quantity itself or in actual people's lives, so the sensor will be produced accordingly.
Due to the relationship between the temperature and resistance of the P100 thermal resistance, people use its characteristic to invent and produce the PT100 thermal resistance temperature sensor, which is a smart sensor that integrates temperature and humidity. The temperature collection range can be -200℃+850℃, and the humidity collection range is 0%~100%. To
The working principle of pt100 temperature sensor
Pt100 is a thermistor with positive temperature coefficient. Speaking of what is a positive temperature coefficient? It must be combined with a negative temperature coefficient. As the temperature increases, the resistance of the electricity becomes larger, which is a thermistor with a positive temperature coefficient. On the contrary, if the resistance of the resistor becomes smaller as the temperature increases, it is a thermistor with a negative temperature number. To
The reason why pt100 is widely used is not only because it can measure a wide temperature range (tens of degrees below zero to several hundred degrees above zero), but also because of its very good linearity. Once the change is made, the increase in the resistance of the resistor is basically the same. In this way, our program is greatly simplified.
However, pt100 also has its shortcomings, that is, every time the temperature rises by one degree, the bias change is too small, only 0.39 ohms, so it needs to provide high-precision and low-noise conversion on the hardware.
pt100 connection
Careful customers, will study the connection of pt100, pt100 has two-wire and three-wire sensors, because the line itself must have resistance, and it is mentioned above that for every degree of change, pt100 only changes 0.39 ohms, then if the line of pt100 is very Longer term, the higher the resistance, and the different wires, the different resistance, which will definitely be the result of the measurement. So you can understand now that the two-wire pt100 is only suitable for short-distance applications. For long-distance applications, a three-wire system must be used.
The above is the working principle of the pt100 temperature sensor. If you have any questions or selection problems, please contact us directly.