PT100 and PT1000 are a type of thermocouple

Working principle of PT100/PT1000
PT100/PT1000 is a platinum thermistor, and its resistance value is proportional to the change in temperature. The relationship between the resistance value of PT100 and temperature change is: when the temperature of PT100 is 0 ℃, its resistance value is 100 ohms, and at 100 ℃, its resistance value is about 138.5 ohms. Its industrial principle: When PT100 is at 0 degrees Celsius, its resistance value is 100 ohms, and its resistance value will increase uniformly with the temperature.
If the PT100 temperature sensor is composed of two sensors used to measure temperature difference, there is a given continuous function relationship between the output signal and the temperature difference. Therefore, it is called. There is a given continuous function relationship (usually a linear function) between the output signal of the PT100 temperature sensor and the temperature variable. Early produced PT100 temperature sensors had a linear function relationship between their output signal and the resistance value (or voltage value) of the temperature sensor. The standardized output signals are mainly DC electrical signals ranging from 0mA to 10mA and from 4mA to 20mA (or 1V to 5V). Other standardized output signals with special regulations are not excluded. Temperature transmitters can be divided into two wire and four wire systems according to the power supply wiring method. [2] There are electric unit combination instrument series (DDZ-II, DDZ-III, and DDZ-S) and miniaturized modular, multifunctional intelligent transmitters available. The former does not come with a PT100 temperature sensor, while the latter two types of transmitters can be conveniently combined with thermocouples or thermistors to form transmitters with sensors.
PT100 temperature sensor/PT1000 temperature sensor is an instrument that converts temperature variables into standardized output signals that can be transmitted. Mainly used for measuring and controlling temperature parameters in industrial processes. Transmitters with sensors typically consist of two parts: sensors and signal converters. Sensors are mainly thermocouples or thermistors; Signal converters mainly consist of measurement units, signal processing and conversion units (due to the standardization of industrial thermistors and thermocouples, signal converters are also known as transmitters when used as independent products). Some transmitters have added display units, while others also have fieldbus functions.