Platinum resistance: introduction to the working principle and advantages of platinum resistance temperature sensor

　　platinum resistanceTemperature sensors have different resistances according to different temperatures. The platinum resistance is connected to the circuit, and the change of resistance can be known by observing the change of current. This paper mainly introduces the working principle and advantages of platinum resistance temperature sensor.
　　1. platinum resistance temperature sensor operating principle
Like thermistors, platinum resistance temperature sensors (RTDs) are platinum thermistors. Measuring Voltage When calculating the RTD temperature, the DMM uses a known current source to measure the voltage generated by the current source. Voltage refers to the voltage between the RTD plus the voltage drop between the two wires. For example, an RTD has a resistance of 100 and only a 0.385 change in resistance per 1. If the resistance of each lead is 10, it will cause a measurement error of 26, which is unacceptable. Therefore, the RTD shall be measured with 4 wire ohms.
RTD is a more stable temperature sensor, and its linearity is better than thermistor. But the RTD is also a slower and more expensive temperature sensor. Therefore, RTD is very suitable for applications with strict requirements for accuracy, and speed and price are not important.

　　2. platinum resistance temperature sensor application range
Platinum resistance temperature sensors are temperature sensors used to measure air, soil and water. The sensor consists of a precise platinum resistance temperature measurement element and a protective cover processed by a special process. The sensor is led out from the sensor element for measurement through a 4-core shielded signal cable. Usually measured with 4-wire measurement method, can reduce the line resistance caused by the measurement error. Platinum resistance temperature sensors have excellent compatibility and long-term stability, and are widely used in meteorological and environmental protection departments.
　　Main advantages of 3. platinum resistance temperature sensor
Wide temperature measurement range: Due to the stable characteristics of platinum, it will not cause physical or chemical changes due to high and low temperatures. The platinum resistance temperature sensor is a kind of temperature sensor, which is made by some function relationship between its resistance and temperature. Since the characteristic curve of platinum resistance is nonlinear, the standard relationship between resistance and temperature is given in the form of a scale table, expressed by the resistance-temperature polynomial function R(t). However, in actual measurement, it is more convenient to use the temperature-resistance function T(r) for measurement and calculation. Platinum resistance sensors have good long-term stability and are often used in protective equipment.
In addition to the above, when using a platinum resistance temperature sensor, you should also pay attention to the good insulation between the temperature sensing elements (double branch structure) and between the temperature sensing elements and the ground, otherwise it will directly affect the accuracy of the measurement results, and even affect the normal operation of the instrument. In short, when using a platinum resistance temperature sensor to measure temperature, first of all, we must correctly select the model, install and use it reasonably, try to set the method, eliminate various external influences, reduce additional errors, and achieve the purpose of accurate, simple and durable measurement.
The main products of Jinzhou Jingwei Instrument Co., Ltd. are pt20, intrinsic safety constant power thermal flowmeter, pt100 platinum resistor, constant power thermal flowmeter, pt100, pt100 thermal resistor, platinum resistor, thermal flow sensor, thermal resistor, temperature field calibrator, high precision thermometer, oil and gas recovery flowmeter, thermocouple, temperature transmitter, temperature sensor, etc. It has the ability to produce high-quality, high-precision industrial sensors and instrumentation. At present, the use of our products has reached more than two thousand users. "As long as users of Jinzhou's subtle products will be repeat customers". Our company's aim is "to the quality of development, reputation to win the world". Cooperation units: State-owned 171 Factory, Hangzhou Focus Technology Co., Ltd., China Institute of Metrology, Tianxin Instrument Group Co., Ltd. Since its establishment, our company has been striving for perfection and innovation on the premise of meeting the continuous improvement of product quality requirements of users, and has achieved rapid development. China's products have entered an era of high quality, and we have benefited from this era.