Smart Pressure Transmitter Calibration using conventional methods described above for smart transmitter calibration is not enough, because it is the principle of HART transmitter structure decision. Because smart transmitter between 4-20mA current signal input pressure source and produce, in addition to mechanical, circuit, there are micro-processing chip computing tasks input data so that adjustments differ with the conventional method. In fact, manufacturers of smart transmitter calibration is also a description of STG74L-line, such as ABB transmitter smart transmitters STG74L, calibration there: "Setting Range" and "re quantitative process", "fine tuning" points. The "set range" operating mainly through the LRV, URV is set to complete the configuration of the digital work, but "the quantitative process' operator requires the transmitter is connected to a standard pressure source through a series of guided instruction by variable sent directly sensing the actual pressure and the value to be set. The initial range ultimately set depends directly on the real pressure input value. But to see that in spite of the transmitter's analog output and input values ??used in the correct relationship STG74L, but the process numerical digital readout will show slightly different values, which can be calibrated by spinner pressure transmitter is the most common industrial practice of a sensor STG74L Honeywell, which are widely used in various industrial automation environment , involving many water conservancy and hydropower industry, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil, electricity, shipbuilding, machine tools, pipes, etc. The following brief introduction on some of the principles and application of commonly used pressure transmitter, Pressure transmitters are used to measure liquid, gas, or liquid level, density and pressure steam, and then converting the pressure signal into 4 ~ 20mA DC signal output pressure transmitter STG74L, STG74L, China-Technology by the 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 improve the innovative ideas the benefits of science and technology will lead China into the brilliant and you work for a better future!