教你如何区分一次仪表和二次仪表

发布时间:2018-01-18 点击:3481次 发布人:admin

一次仪表在自动检测、自动调节系统中,首先接触被测参数(如压力、差压、液位、流最、温度等),并将被测参数转换成可侧信号或标准信号,然后根据检测、调节系统的要求送入有关单元进行显示或调节。

一次仪表的类型很多,有压力变送器、液位变送器、温度变送器以及靶式流量变送器、远传式转子流量计、椭圆齿轮流最计等。近年来,各种特殊的一次仪表也相继出现,如霍尔压力变送器、卡门涡列流量变送器等。

一次仪表多数分散安装在现场。为了便于现场观察,某些一次仪表还具备显示被测参数的机构,但多数是将被测参数转换成标准输出信号送给显示仪表,由显示仪表进行指示、记录、报警或积算,所以显示仪表相对一次仪表而言又称为二次仪表,它一般集中安装在控制室的仪表盘上。使用时,要考虑一次仪表和二次仪表的适当配合。 

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