The main features of the pressure transmitter are:
Adjustment range reference accuracy: ±0.015%~±0.5%
Static pressure effect: L membrane box ± [0.07% range + 0.052% upper range limit] / 3.4MPa {500psi}
M, H and V capsules ± [0.1% range + 0.028% upper range limit] / 6.9MPa {1000psi}
Overpressure effect (H, M, and V bellows): ±0.03% upper limit/6.9MPa {2000psi}
Stability (H, M, and V bellows): ±0.1% of the upper limit/60 months starting in 1958. China began to develop the appearance of the electric unit combination; in 1964, a full set of 27 varieties of instruments were put into production; from 1965, China began planning electrical unit instrument clusters and organized a unified design of electric unit instrument clusters in 1970. At the same time, the research and development of pneumatic unit instrument clusters was successful; in the mid-1970s, electric unit instrument clusters were researched. In the meantime, the transmitter is also an important category of the combination of the above units. The prior production was a force balance type, and a vector balanced transmitter was developed later. In the 1970s, domestic transmitters were made rough, with poor stability, low accuracy, small range ratios, inconvenient adjustments, and fewer types of goods.
In 1978, China began to reform and open. In 1979, the domestic instrument factory and Rosemount signed a technology transfer contract for 5 capacitive pressure/differential pressure transmitters. This is the first important commodity technology transfer contract introduced by China's instrument appearance occupation. . Regarding the transmitter profession or even the entire instrumentation profession, this should be a landmark event.
Following the influx of transmitter products from foreign instrumentation companies, domestic manufacturers and users gradually learned to include Rosemount in the United States, Honeywell in the US, Yokogawa in Japan, E+H in Germany, Foxboro in the United States, and Fuji in Japan. , Japan Hitachi, the United States Moore Industry, the United States Smar and other companies produced goods.
In the early 90s of last century, the network was strongly promoted, and the annual sales volume increased rapidly. In 2007, the order volume of the transmitter's merchandise mall reached 80,000 units, which exceeded the Rosemount transmitter products. In recent years, due to the substantial increase in the sales volume of multinational companies' transmitters in China, Siemens, Germany E+H, and ABB have established their own wholly-owned transmitter production lines in addition to the introduction of technology or joint venture production. It can be seen that the competition in China's transmitter malls will become more and more intense. In the introduction trend of “changing technology with shopping mallsâ€, we paid a heavy value. In addition to the struggle of state-owned brands in low-end shopping malls, the old state-owned enterprises simply collapsed across the board. At this moment, some manufacturers represented by private enterprises in our country quietly emerged and grew stronger, bringing a chance to the disappointing China's transmitter industry.
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