【测控专业英语】Process Control System过程控制系统解析

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2 Measuring Transmitter
2– The signal transducer receives the output of the
primary element and produces and electric current signal. – 信号变送器接收主要（敏感）元件的输出，并产 生一个电流信号。 – For example, a thermocouple converts temperature into a millivolt signal, and the thermocouple transducer converts the millivolt signal into a electric current in the range 4 to 20 mA. – 例如一个热电偶将温度转换为一个毫伏信号，同 时，热电偶变送器将毫伏信号转换为 4-20毫安的 电流信号。
– signal transducer 信号变送器 – temperature/flow/pressure transmitter 温度/流量/ 压力传感器 – proportional/integral/derivative mode 比例/积分/微 分模式 – microcontroller 微控制器 – switch 开关
– 一个电阻元件将温度转换为阻值，然后，电阻变 送器将阻值转换为电流信号。其他主要元件也是 以类似的方式工作。
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3 Controller
1– The controller includes the error detector and a unit
that implements the control modes. – The error detector computes the difference between the measured value of the controlled variable and the desired value (or setpoint).
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Words and Expressions
– manual control 手动控制
– local/remote setting 本地/远程设置 – on-off control 开关控制 – cascade control 串级控制 – bumpless transfer 无扰动切换
– adaptive gain 适应性增益 – pattern recognition 模式识别
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Main content
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Process
Measuring Transmitter Controller Manipulating Element
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3 4 5
Process Control
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1 Process
– The process block in Fig. 7.1 represents everything performed in and by the equipment in which a variable is controlled. – The process includes everything that affects the controlled or process variable except the controller and the final control element.
Chapter 2 Introduction to Control System
Unit 7
Process Control System
测控技术与仪器专业英语
Words and Expressions
– final trol element 最终控制单元
– sensing element 检测元件、敏感元件
– 图7.1中过程框图表达了其中的每一个环节和控 制变量的设备。过程包括影响被控量和过程量 的每件事，除了控制器和最终控制单元。
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2 Measuring Transmitter
1– The measuring transmitter or sensor senses the
value of the controlled variable and converts it into a usable signal. – 测量传感器可以感知被控量的值，并将其转换为 可用信号。 – Although the measuring transmitter is considered as one block, it usually consists of a primary sensing element and a signal transducer (or signal converter). – 虽然，测量变送器作为一个框图环节来考虑，但 它通常是由主要的敏感元件和一个信号变送器 （或信号变换器）组成。
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2 Measuring Transmitter
2– A resistance element converts temperature into a
resistance value, and the resistance transducer converts the resistance value into an electric current signal. – Other primary elements are handled in a similar manner.
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2 Measuring Transmitter
1 – The term measuring transmitter is a general term to
cover all types of signals. – 术语测量传感器是一个适合所有类型信号的通 用名称。 – In specific cases, the word measuring is replaced by the name of the measured signal (e.g. temperature transmitter, flow transmitter, pressure transmitter, etc. ). – 在特殊情况下，测量一词用被测信号的名称所 替代。（例如，温度传感器，流量传感器，压 力传感器等等) 。