Application of Remote Transmitter in PVC Production Recently, Jiwei Reed-11 Remote Transmitter won the bid in a new PVC project of a large state-owned enterprise. The project proposes to install Magnetic Level Indicators to realize remote real-time measurement and control of the liquid level in PVC production storage tank. Polyvinyl Chloride (PVC) plastic, commonly known as "vinyl," has become one of the most widely-used types of plastics. Pure polyvinyl chloride is a white, brittle solid. Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization. VCM and water are introduced into the reactor along with a polymerization initiator and other additives. The contents of the reaction vessel are pressurized and continually mixed to maintain the suspension and ensure a uniform particle size of the PVC resin. The reaction is exothermic and thus requires cooling. As the volume is reduced during the reaction (PVC is denser than VCM), water is continually added to the mixture to maintain the suspension. Figure 1 shows the process flow chart of PVC production: Magnetic Level Indicators are installed to monitor the real time liquid level for each PVC production tank, because the ethylene, liquid chlorine and vinyl chloride monomer are toxic and flammable, it is necessary to monitor the liquid level to avoid leakage or deflagration accidents. So, the performance of level sensor with stable, reliable and durable characteristics Shenzhen Jiwei Automations Ltd.

Because the measured medium is toxic, corrosive, gasified, flammable and explosive, it is difficlut to monitor the liquid level on-site, and mostly need to transmit the liquid level signal to a central control room simultaneously. Reed Transmitter is usually tied to measuring float and operated together with Magnetic Level Indicator. Through the remote transmission of liquid level signal to the control room in the form of 4-20mA current, the liquid level height can be controlled remotely in real time. However, the quality of domestic brands often occurs the following problems: 1. Easy to penetrate...