一个小型的纸浆厂或造纸厂必须根据产量选用控制仪表和设备,在很多情况下,仪表控制设备消耗大量资金,所以小厂在确定其仪表控制系统时,需在系统精度和功能方面做到恰到好处,这就不是一件容易的事情。在工业发达的国家中,某些小厂为了经营上有利可图,必须生产某些特殊用途纸张,由于对产品质量要求高,以及必须具备生产不同等级产品的灵活性,对这类工厂的控制要求应严格。通常需要一个综合的、现代化的控制系统,同时从经济角度分析这种需要 A small pulp mill or paper mill must choose the control instruments and equipment according to the output. In many cases, the instrument control equipment consumes a large amount of money. Therefore, when determining the instrument control system, the small factory needs to be just right in terms of system accuracy and function This is not an easy task. In the advanced industrialized countries, certain small factories, in order to be profitable to operate, must produce certain special-purpose paper. Due to the high quality of their products and their flexibility to produce different grades of products, the control requirements for such factories Should be strict. Often an integrated, modern control system is needed, while analyzing this need from an economic point of view