Smart Pressure Transmitter with co HART protocol is divided into two types, and with 482 or RS232 interface. Smart pressure transmitter with HART protocol is superimposed on a dedicated frequency signal imported differential pressure transmitter on analog signals, analog and digital at the same time to communicate. Smart pressure transmitter inside with RS232 or 485 of the analog signal A / D conversion by the microprocessor to calculate the D / A output. Pressure transmitter has been the development capacitance transmitter proliferation of different types of silicon piezoresistive transmitters, differential inductors and ceramic capacitive transmitter such as the transmitter. In the 1990s, the rapid rise of fieldbus technology Honeywell differential pressure transmitters, industrial process control system gradually to fieldbus control system with two-way communications and intelligent instrument control direction. Resulting in a new generation of intelligent pressure transmitter. Their main features are as follows. 1, since the compensation function such as nonlinear, temperature error, response time, noise and cross induction and the like. 2. The self-test at power-on self-diagnostic function, implemented in the work of running checks. 3, has a function of two-way communication system, a closed loop between the microprocessor and the basic work of the sensor. 4, information storage and memory function. 5, the digital output. Based on the above features, precision intelligent pressure transmitter, stability, repeatability and reliability have been improved and improved. Its ability to achieve the two-way communication and remote control of computer software and other state-set range. Intelligent differential pressure transmitter differential pressure transmitter _ _ China-Technology provided by Jinan-Technology Limited. Jinan Huahui Technology Co., Ltd. (www.cnhuahui.com/) strong, credible, in Jinan, Shandong pressure instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead China-Technology into the brilliant and you work for a better future!