Introduction to Differential Pressure Transmitter

Pressure and differential pressure transmitters are the most important category of automated instruments. They have a wide range of applications. In addition to pressure and differential pressure measurement, they can also be used to measure other parameters such as flow, liquid level, and specific gravity. Its sales volume is very large. According to reports, only Yokogawa Kagawa’s sales volume reached 100,000 units in 2004, while the annual output of Rosemount (Rosemount, a subsidiary of Emerson Process Management) company 1151 and 3051 reached 43. Ten thousand units, the total output over the past 35 years has exceeded 8 million units. Since Yokogawa of Japan introduced EJA pressure and differential pressure transmitters in 1991, the total output has exceeded 1.5 million units. From the 1960s to the late 1970s, we usually used domestically-made force-balanced electric type II and type III transmitters, which had low accuracy, unstable performance and high failure rate. In the early 1980s, Xi'an Instrument Factory cooperated with Rosemount Company of the United States to produce 1151 series transmitters in Xiyi, thus creating a precedent for foreign high-performance transmitters to enter the Chinese market quickly; then Japan's Fuji (Fuji) FC series Transmitters and EDR/EPR series transmitters from Hitachi (HITACHI) are also introduced and produced in my country's Shanghai No. 1 Automation Instrument Factory, Lanlian Instrument Factory, and Dalian Instrument Factory. With the influx of foreign instrumentation companies’ transmitter products, we have gradually accepted including American Honeywell (Honeywell), American Rosemount, Japan Yokogawa, E+H (EndressHauser), American Products produced by Foxboro, Fuji, Hitachi, Moore, Smar, etc. In the early 1990s, Sichuan Instrument Factory and Yokogawa Corporation established a joint venture Chongqing Chuanyi Yokogawa Company (later changed to Chongqing Yokogawa Chuanyi Company) to produce EJA series transmitters. Hua's sales network has vigorously promoted its sales, and its annual sales have grown rapidly. Its limelight has even surpassed Rosemount's transmitter products. After ABB launched the MV2000T smart transmitter in 1999, it also adopted almost the same approach as Rosemount and Yokogawa. It sought a partner in China-Shanghai Willtech Co., Ltd., and established a joint venture production line. Sales of tens of thousands of units. In recent years, due to the substantial increase in the sales volume of transmitters by multinational companies in China, in addition to Japan’s Fuji Company and Zhejiang University Supcon Instruments Co., Ltd. to produce CXT transmitters, Siemens, E+H, and ABB have all been in China. Build your own transmitter production line. This shows that competition in the Chinese transmitter market will become increasingly fierce. The first generation product-analog transmitter. We used domestically-made force-balanced electric type II and type III transmitters in the early days. The accuracy can only reach 0.5% and 1.0%. In the early 1980s, Xi'an Instrument Factory introduced American Rosemount Company represents the 1151 series transmitters of foreign countries in the early 1970s. Except for the accuracy of the DR type micro differential pressure transmitter, which has an accuracy of 0.5%, the rest are mostly 0.25%. This is the first time that Chinese people have come into contact with a large number of A generation of foreign transmitters. Its characteristic is that it adopts the analog meter with 4-20mA signal transmission, the on-site display meter is pointer type, the range ratio is about 6:1, the accuracy is 0.25-0.5%, and the stability is 6 months. The aforementioned FC series transmitters from Fujifilm and EDR/EPR series transmitters from Hitachi are also products of the same era. The second generation product-smart transmitter In 1983, Honeywell of the United States first introduced the smart transmitter-ST3000. In 1989, it launched the first smart transmitter with all-digital two-way protocol. The characteristics are: the sensor element adopts micro-mechanical electronic processing technology, and the circuit board composed of temperature measurement compensation element and large-scale integrated circuit is installed; the detection accuracy and range ratio of the transmitter are improved; the DE communication protocol of the company is carried, and at the same time Transmit analog signals and digital signals; the transmitter's local display table is improved from analog pointer type to digital type; it can be configured remotely using a hand operator or in the control system to realize remote setting or remote modification of transmitter configuration data. Later, Rosemount 1151 series transmitters have undergone several improvements. The range ratios reached 15:1, 40:1, 50:1, the accuracy reached 0.1%, 0.075%, and the stability was improved from 6 months. By 2 years, and some products have HART protocol, the transition from analog instruments to intelligence has been realized.

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