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单元组合仪表是按测量和控制系统中各组成部分的功能和现场使用的要求,将整套仪表划分成若干个能够独立实现一定函数转换关系的单元,用这些通用单元就可以构成多种检测与控制系统。单元组合仪表分为气动单元组合仪表和电动单元组合仪表。前者又称为QDZ型仪表,用压缩空气(1.4公斤力/厘米~2)作能源,传送的是0.2～1公斤力/厘米~2的统一气压信号。后者又称为DDZ型仪表,它包括DDZ-Ⅰ型、DDZ-Ⅱ型、DDZ-Ⅲ型三个系列:Ⅰ型是电子管型的;Ⅱ型是晶体管型的;Ⅲ型是集成电路的。
Unit instrument is measured by the measurement and control system components and field-based functions of the requirements of the entire instrument is divided into a number of units can be achieved independently of the conversion function of a certain unit, with these common unit can constitute a variety of detection and control system. The unit combination meter is divided into the pneumatic unit combination meter and the electric unit combination meter. The former, also known as QDZ meter, uses compressed air (1.4 kgf / cm -2) as the energy source to deliver a uniform pressure signal of 0.2 to 1 kgf / cm 2. The latter is also called DDZ instrument, which includes DDZ-Ⅰ type, DDZ-Ⅱ type, DDZ-Ⅲ type three series: Ⅰ type is tube type; Ⅱ type is transistor type; Ⅲ type is integrated circuit.