Instrument is a very widely used instrument in modern society. 行业也可以叫自控， 自控在市政项目里面，一般归弱电 ，统一由电气专业负责。 The instrument industry can also be called self-control. Self-control is in municipal projects. Generally, it belongs to weak power , and is unified by the electrical professional.
化工厂 ，仅仅维护，就分了很多：现场维护、计量、检定（仪表标定）、现场维护、维修、分析、 DCS 、技加、有毒（可燃）仪器等等；在化工厂里面，通常还配有设计所，这样就多了一个设计分工。 Self-control in chemical plants , just for maintenance, it is divided into a lot: on-site maintenance, measurement, verification (instrument calibration), on-site maintenance, repair, analysis, DCS , technical plus, toxic (flammable) instruments, etc .; In chemical plants, usually There is also a design office, so there is an additional division of design.
班组 更全面，包括 组态 、编程）、开发（软硬都包括）、测试（很重要，基本是个独立的专业了）等等。 Broadly speaking, in addition to the factory, there are also installation and commissioning ( more comprehensive than the DCS team in the factory , including configuration and programming), development (both hardware and software), testing (very important, basically an independent specialty), etc. Wait.
主要 分为 两大类，一种是 数码 显示，有的没有自动记录，只显示当前温度，高档的有 记录卡 ，可与 计算机 连接控制。 Meters are mainly divided into two categories, one is digital display, some have no automatic recording, only display the current temperature, high-end has a recording card , and can be connected to the computer to control. 仪表 ，指针右显示当前温度，有记录笔自动记录温度位置，加热时间都记录出来。 One is a mechanical pointer type automatic recording instrument . The current temperature is displayed on the right of the pointer, and the temperature position is automatically recorded by a stylus, and the heating time is recorded. 电位差计 ，多用于检测校正，比较 精密 。 The other is a potentiometer , which is mostly used for detection and correction and is more precise .
按测量对象不同，分为 电流表 ( 安培表 ） 、 电压表 ( 伏特表 ) 、 功率表 ( 瓦特 表) 、 电度表 ( 千瓦时 表)欧姆表 等；按仪表工作原理的不同分为磁电式、 电磁式 、电动式、感应式等；按被测 电量 种类的不同分为交 流表、直流表、交直流两用表等； Electrical meters are divided into ammeters ( ampere meters ) , voltmeters ( voltmeters ) , power meters ( wattmeters ) , watt-hour meters ( kWh meters ), ohmmeters, etc. according to the measurement object ; they are divided into different meter working principles Magnetic type, electromagnetic type , electric type, inductive type, etc. According to the type of measured power , it is divided into AC meter, DC meter, AC and DC meter, etc .;
Divided into fixed type ( switch plate type ) and portable type according to the nature of use and device method ;
Divided into 0 according to different error levels . Level 1 , 0 . Level 2 , 0 . Level 5 , 1 ． 0 level, 1 . Level 5 , 2 . Levels 5 and 4 with a total of seven levels