论文部分内容阅读
日立厂E系列电动差压变送器除了EDR-11和EDR-22两个基型外,还有32个品种,用于测量差压、流量、压力和液位等参量。下面仅对EDR-11和EDR-22型差压变送器作简要介绍。一、特性 (1) EDR-11,-22变送器的敏感元件是两片由日立厂制造的、性能完全一样的高精度膜片,因此不受温度变化的影响。它们是用防腐的弹性材料制成。膜片是和一个用同样材料制成的环一起焊到主体上的。焊接是用的氩弧焊。焊接时,氩气在焊接处构成一个惰性的区域,使被焊材料不会被周围的气体和空气
Hitachi E series electric differential pressure transmitter in addition to EDR-11 and EDR-22 two basic types, there are 32 varieties, used to measure differential pressure, flow, pressure and liquid level and other parameters. The following only for EDR-11 and EDR-22 type differential pressure transmitter for a brief introduction. First, the characteristics (1) EDR-11, -22 transmitter sensor is two manufactured by Hitachi plant, the exact same performance of high-precision diaphragm, it is not subject to temperature changes. They are made of a preservative elastic material. The diaphragm is welded to the body together with a ring of the same material. Welding is the use of TIG. When welding, argon forms an inert zone at the weld so that the material being welded is not affected by the surrounding gas and air