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前言 气动、电动单元组合仪表中的测量单元——变送器,直接与系统介质接触,用于测量生产过程中的压力、差压、流量、液位等等。而各种被测介质的腐蚀特性各不相同,因此,变送器的测量敏感元件——膜盒,由于直接和介质接触必须耐各种介质的腐蚀。在变送器中接触被测介质的零部件对腐蚀特别敏感的是测量元件——膜盒、膜片。这些零件一般
Preface Pneumatic, electric unit Instrument in the measuring unit - transmitter, the direct contact with the system media, used to measure the production process of pressure, differential pressure, flow, level and so on. And all kinds of measured corrosion properties of different media, therefore, the transmitter of the measurement of sensitive components - Membrane, due to direct contact with the media must be resistant to a variety of media corrosion. Components that contact the measured medium in the transmitter are particularly sensitive to corrosion - the measuring cell, diaphragm, and diaphragm. These parts in general