Hong Yi Wo Instrument Co., Ltd. (Zhejiang Division): pressure transmitter technology development: the pressure transmitter differential pressure transmitter is the most important process variables of a class, a very wide range of applications, can be used in addition to the pressure, differential pressure measurements, can be used for flow, level, specific gravity, and other parameters are measured. A 5000t / d cement production line, key parts in process pressure transmitter must be set, as in the kiln, kiln, preheater at all levels of the top and bottom of each sub-duct and cooling machine each room, Process to monitor the proper operation. According to statistics, a total of cement production line set pressure transmitter is about 80 units. Pressure transmitter measurement mechanism according to points, the most commonly used are capacitive, inductive, diffused silicon, vibrating wire and so on. In addition to the DR for measuring vacuum kiln type differential pressure transmitter Accuracy is 0.5%, the rest are mostly 0.25%, which is characterized by using transmission 4mA ~ 20mA analog meter, head for the local display table Analog, turndown ratio of about 6:1, the stability of six months, which is the first generation analog transmitter. The second generation product is smart transmitters, called intelligent concept is: sensor and transmitter is driven by a microprocessor, and with communication and self-diagnostic capabilities. In addition to the smart pressure transmitter with high accuracy (0.1% to 0.075%), a large range ratio (maximum to 100:1) and high stability (1 to 5 years), but it is generally with HART protocol or production company agreement, the latter products are also in line with international standards FF fieldbus or PROFIBUS-PA protocol, it is replaced by a digital display table, but also hand Communicator or remote configuration of the control system, realize remote settings or distant modify transmitter configuration data. In the 21st century, the third generation of the transmitter - Digital Smart transmitter and gradually coming into view. As the third generation of the transmitter uses advanced detection technology, eliminating moisture, dust, and other harsh environment of the transmitter site measuring the impact of higher accuracy, the accuracy of which allegedly are better than 0.05%; range of sub-file finer scale than expanded to 200? 1; stability up to 5 years; communication protocol more whole, the new transmitter also adopted a safety case, to ensure that the process conditions when the threshold is exceeded safe shutdown. As the second generation of the transmitter has been able to meet the cement monitoring requirements, and the price is also higher third-generation transmitter, so I believe that the cement plant temporarily not promotion. http://www.yihemeter.com