Self-test, self-calibration, self-diagnostic function - common sensors require periodic inspection and calibration of the sensor, to ensure that it is accurate enough in normal use, these jobs generally require the use of the sensor from the demolition site to the laboratory or inspection department . For online measurement sensor is abnormal is not diagnosed in time. Smart sensor situation is much improved, first self-diagnosis function self-test at power-on sensor characteristics, diagnostic tests to determine whether the fault component. Secondly, online correction based on the use of time, the microprocessor utilization in EPROM data within the metrological characteristics compared proofreading. Common types of resistive sensors is a resistive sensor function is measured, such as displacement, deformation, force, acceleration, humidity, temperature and other physical quantities converted into a resistance value of formula such a device. There are resistance strain gauge, piezoresistive, thermal resistance, thermal, gas, humidity and other resistive sensors. Frequency power inverter power sensor through the voltage and current signals inputted AC sampling wireless sensor, then the sample value of the input is connected to the secondary instrument through the transmission system and digital cable, optical fiber, digital input secondary instrument for voltage and current sampled value for computing, you can get the voltage rms, current rms, fundamental voltage and fundamental current harmonic voltage and harmonic current, active power, fundamental power, harmonic power and other parameters. Temperature sensor _ Xinfeng (Online) _ Shanxi sensor sensing provided by the Xinxiang City, Xinfeng purification technology Limited. Xinxiang City, Xinfeng purification Sensing Technology Co., Ltd. (www.xfcgq.com) (www.xfcgjh.com) is a leader in Xinxiang, sensors, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. In Xinfeng leadership with the staff warmly welcome all inquiries negotiations to create a better future Xinfeng.