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CW-430型双波纹管差压计的计量精度为1级。这种机械式仪表有许多优点。使用广泛.但有些表存在不同程度的静压误差,有的误差高达8％,如一台静压误差5％的仪表为日用气量100万m～3的用户计量,供方一天将亏损近万元。为什么CW-430型双波纹管差压计会产生静压误差呢?原因是:①双波纹管中的真空度与填充液未达到设计要求,仪表受压时,波纹管产生凸凹状态,影响它的有效面积。②生产厂家的波纹管模具精度发生变化。影响波纹管有效面积的一致性。
CW-430 dual bellows differential pressure meter measurement accuracy of 1 level. This mechanical instrument has many advantages. But some of the table there are different degrees of static pressure error, and some errors up to 8%, such as a static pressure error of 5% of the instrument for daily gas consumption of 1 million m ~ 3 user measurement, the supply side will lose nearly a million yuan. Why CW-430 double bellows differential pressure gauge will produce hydrostatic error? The reason is: ① double bellows in the vacuum and the filling liquid does not meet the design requirements, the instrument pressure, the bellows have convex and concave state, affecting it The effective area. ② manufacturers bellows mold precision changes. Affect the effective area of the bellows consistency.