Automated testing instruments are one of the most critical subsystems in the control system. The general automatic detection instrument is mainly composed of three parts: a sensor, a device that converts a non-electricity signal into an electrical signal; a transmitter, which converts the electrical signal converted by the sensor into an easily processed 4-20ma current signal or 0 ~ The 5v voltage signal is sent to the programmable logic controller for analysis, calculation and processing; the display shows the measurement results intuitively. These three parts are organically combined. If any part is missing, it cannot be called a complete test instrument. Automatic detection instruments are widely used in industrial production due to their accurate measurement, clear display, and simple operation. Moreover, the automatic detection instruments have an interface with a microcomputer, which is an important part of the automatic control system. The eyes of an automated control system. With the development of science and technology, automated detection technology has also been greatly developed, and automated detection instruments have also been widely used in sewage treatment, so that the sewage treatment plant not only saves a lot of manpower and material resources, but more importantly, it can be timely Adjust the sewage treatment process. This article will take the sewage treatment of chemical production workshop of Hongfa Coking Plant of Jiangsu Shagang Group as an example to introduce the application of automatic detection instrument in sewage treatment system. Sewage treatment process The sewage treatment section of the chemical production workshop of Jiangsu Shagang Group Hongfa Coking Plant mainly accepts ammonia distillation wastewater and gas water sealing water from other sections. First of all, the pretreatment of the waste water is carried out. The waste water enters the degreasing tank, and the oil and debris in the sewage is initially removed by the action of the two oil batching machines. Remove smaller floating objects; followed by biochemical treatment. A series of chemical reactions are mainly carried out through the anaerobic tank, anoxic tank and aerobic tank. After simple pretreatment, the water undergoes denitrification, carbonization and nitrification reactions in the anaerobic tank, anoxic tank and aerobic tank to reduce the content of cod, ammonia bile and dissolved oxygen in the sewage; then by adding coagulant The suspended impurities in the sewage are precipitated, and finally purified and filtered, and the treated water is discharged after the target is met, and the treated sludge can be used as a renewable resource after being pressed with a belt filter press. The process flow is shown in the attached drawing. Ultrasonic level gauge An ultrasonic liquid level gauge is installed in the water lifting well and the anaerobic water supply well respectively. The difference between the front and back liquid levels in the well trough reflects the amount of gas water sealing water from other sections and the anaerobic tank sewage. And transmitted to the plc controller for analysis and calculation. When the liquid level exceeds the set value, the operation column switch of the on-site pump can be automatically switched on and off when the operation column switch of the on-site pump is in the automatic position. In this way, the pump running state can be adjusted accurately and timely according to the amount of external water, and the fatigue of the equipment can be reduced; at the same time, the human resources consumption of the three shifts of the traditional pump station can be eliminated. Flowmeter and transmitter Real-time monitoring of flow and throughput. For the management of the operation of the sewage treatment section, water volume is an important control parameter. Accurate and timely control of the amount of water inflow has an important role in process control and improving the ability of the sewage section to resist the impact of hydraulic loads. Traditional water flow measurement uses weir plates or venturi flow channels, etc., which have the disadvantages that they cannot be monitored and displayed in real time. Sewage treatment in the chemical production workshop of Hongfa Coking Plant of Jiangsu Shagang Group has installed 5 sets of imported electromagnetic flowmeters with a measuring range of 0 ～ 1200m3 / h in the return sludge pipeline and remaining sludge pipeline and anaerobic tank to measure the return sludge and residual The flow of sludge. The electromagnetic flowmeter can not only display the water flow on the spot, but also can display the flow and accumulated processing volume on the host computer in real time through the transmission of the PLC, so as to achieve the purpose of accurately measuring the processing water volume and providing real-time flow for operation management. After installing the electromagnetic flowmeter, the on-duty personnel can judge whether the return sludge pump and the remaining sludge pump are working normally according to the displayed flow rate, which solves the problem that the submersible pump cannot simply judge whether it is working normally, and the electromagnetic flowmeter also has Easy installation and simple maintenance. Customer Satisfied Products: V Cone Flowmeter-Target Flowmeter-Precession Vortex Flowmeter Company website: Our thermoforming packaging products use recycled PET plastic materials. 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V-cone flowmeter describes the prospect of the detector in sewage treatment