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工业调节仪表的品种很多,但是基本控制作用只有少数几种。例如,电动单元组合仪表与气动单元组合仪表的调节器,在自动控制系统中的作用是相同的;动圈仪表与力矩马达仪表的位式控制作用也是一样的。所以我们在讲控制方式时,主要强调仪表的输出/输入特性,至于某种型号的仪表能否适用于具体场合,那还要考虑仪表的环境条件、能源(气、电)要求、静态精确度以及价格等方面是否合适。今后列举实例中提到的仪表,并不说明它们是该系统的唯一选择。
There are many varieties of industrial regulation instruments, but only a few basic control functions. For example, the combination of an electric unit instrument and a pneumatic unit instrument controller plays the same role in an automatic control system; the same applies to the position control of a moving coil instrument and a torque motor instrument. Therefore, when we talk about the control mode, we mainly emphasize the output / input characteristics of the instrument. As for whether a certain type of instrument can be used in a specific situation, the environmental conditions of the instrument, energy (gas and electricity) requirements, static accuracy As well as the price and so on is appropriate. In the future, the examples mentioned in the instrument, does not mean that they are the only choice for the system.