Abstract
The entry of process automation in nearly all areas of the process industry mandates that all modern metering devices can be integrated into the overall process via simple interfaces and that they meter with high reliability within a given error gap span. In metering systems, it is assumed that the pumps used must be monitored, that is, that they meter reliably when operating in a closed control loop only. The volumetric efficiency of rotating positive displacement pumps has a direct influence on the energetic efficiency, because leakages (backflow losses) between suction and discharge always are energy losses. The pressure dependence of the pump characteristics is mainly determined by the basic design principles and the quality of workmanship of the metering pump. The sandwich diaphragm consists of altogether four single layers whereby the so called protection diaphragm is not exposed to a pressure load under normal operating conditions. The measuring time cycle plays a big part in the sequential measurement of pulsating metered flows. For processes requiring a fast response of the metered flow to a given change in the process profile, high control dynamics are required.
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