Level DetectorsLEVEL DETECTION CIRCUITRYLEVEL DETECTION CIRCUITRYRemote indication provides vital level information to a central location.EO 1.3 STATE the three reasons for using remote levelindicators.EO 1.4 Given a basic block diagram of a differential pressuredetector-type level instrument, STATE the purpose ofthe following blocks:a. Differential pressure (D/P) transmitterb. Amplifierc. IndicationEO 1.5 State the three environmental concerns which can affectthe accuracy and reliability of level detectioninstrumentation.RemoteIndicationRemote indication is necessary to provide transmittal of vital level information to a centrallocation, such as the control room, where all level information can be coordinated and evaluated.There are three major reasons for utilizing remote level indication:Level measurements may be taken at locations far from the main facilityThe level to be controlled may be a long distance from the point of controlThe level being measured may be in an unsafe/radioactive area.Figure 15 illustrates a block diagram of aFigure 15 Block Diagram of a DifferentialPressure Level Detection Circuittypical differential pressure detector. Itconsists of a differential pressure (D/P)transmitter (transducer), an amplifier, andlevel indication. The D/P transmitterconsists of a diaphragm with the highpressure (H/P) and low pressure (L/P) inputson opposite sides. As the differentialpressure changes, the diaphragm will move.The transducer changes this mechanicalmotion into an electrical signal. Theelectrical signal generated by the transduceris then amplified and passed on to the levelindicator for level indication at a remoteRev. 0 Page 15 IC-03
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