Flow DetectorsFLOW CIRCUITRYFLOW CIRCUITRYThe primary elements provide the input to the secondary element which providesfor indications, alarms, and controls.EO 1.5 Given a block diagram of a typical flow detection device,STATE the purpose of the following blocks:a. Differential pressure (DP) transmitterb. Extractorc. IndicatorEO 1.6 STATE the three environmental concerns which canaffect the accuracy and reliability of flow sensinginstrumentation.CircuitryFigure 11 shows a block diagram of a typical differential pressure flow detection circuit. TheDP transmitter operation is dependent on the pressure difference across an orifice, venturi, orflow tube. This differential pressure is used to position a mechanical device such as a bellows.The bellows acts against spring pressure to reposition the core of a differential transformer. Thetransformer’s output voltage on each of two secondary windings varies with a change in flow.Figure 11 Differential Pressure Flow Detection Block DiagramRev. 0 Page 17 IC-04
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
