各种仪表用于化工厂等有腐蚀性气体的环境中时,由于气温变化,在表壳内产生“呼吸”作用,容易将周围的有腐蚀性的气体吸入。使表壳内壁、指针、面板、连接部件等内部机构腐蚀,这样将大大地缩短仪表寿命。对此,过去为解决机芯防锈问题曾采取很多措施,如采用不锈钢、合成树脂等耐蚀性材料,涂防锈漆或接空气配管用空气净化 A variety of instruments used in chemical plants and other corrosive gases in the environment, due to temperature changes in the case have a “breathing” effect, easy to the surrounding corrosive gas inhalation. So that the case wall, pointer, panel, connecting parts and other internal mechanisms corrosion, this will greatly reduce the instrument life. In this regard, in the past to solve the rust movement has taken many measures, such as the use of stainless steel, synthetic resin and other corrosion-resistant materials, coated with anti-rust paint or air pipe air purification