近几十年来由于大工业流程、尤其是大型石油、化工装置的出现,相应地对压力仪表提出了更高的要求,世界各国均在这方面作了在努力,其发展趋势主要是: In recent decades, due to the emergence of large industrial processes, especially large oil and chemical plants, correspondingly higher requirements have been placed on pressure gauges. All countries in the world have made efforts in this regard. The main trends are as follows: