The paper introduces the corrosion prevention of the automatic instruments for thermopair,resistance thermometer, transmitter, flowmeter levelmeter in Chemical processes.

介绍业自动化仪表在氮肥，磷肥生产过程中，对检测控制仪表，热电偶、热电阻、变送器、计、液位计选择。

This article mainly designed one kind to use composition and so on PLC and flowmeter, PH idea, thermometer and liquidometer industrial sewage processing control systems.

本文主要设计了一种利用PLC计、PH计、温度计液位计等组业PH计 污水处理控制系统。

Bench of closed circuit cooling tower that is composed of boiler ,exchanger, orifice flowmeter, water pump, micromanometer , heat indicator and so on is established.

建立了由锅炉、换热器、孔板计、水泵、微压计、温度计等仪器设备组封闭式冷却塔实验台。

The responsion functions of the eddy street flowmeter and the turbine control the separation of the gas-liquid,it's arithmetic was based on BP neural network improved PID control.

文中提出利用涡街计涡轮计响应函数来控制气液分离,其控制算法是基于BP网络改进PID控制算法。

The structure of swirler in swirlmeter is changed.The corner dimension between inlet blades and basic shaft is changed into 45 from 60 and inlet blades into seven from six.

对旋进旋涡计中旋涡发生体结构进行了如下改进:将旋涡发生体叶片主轴夹角由原来60°减小到45,°将叶片由六片增加到七片。