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

介绍业动化仪表在氮肥，磷肥生产过程中，对检测控制仪表，热偶、热阻、变送器、、液位的选择。

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.

本文主要设了一种利用PLC与、PH、温度和液位等组成的业PH 污水处理控制系统。