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

介绍工业自动化仪表在氮肥，磷肥生产过程，测控制仪表，热偶、热阻、变送器、流量、液位择。

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.

本文主要设了一种利用PLC与流量、PH、温度和液位等组成工业PH 污水处理控制系统。