Silometer FMC 671 Z (Technical Information)

1 TechnicalInformationTI 064F/00/enApplication Continuous level measurement usingcapacitance sensors in tanks or siloscontaining liquids or bulk solids Continuous level measurement withhydrostatic sensors deltapilot S intanks containing liquids Limit detection using capacitancesensors in tanks or silos containingliquids or bulk solids Limit detection with vibrating probesLiquiphant FDL 30/31 in tankscontaining liquids Combination of continuousmeasurement and limit detection Continuous level measurement inmaterials of changing characteristicsproviding an automatic correction ofcalibration to compensate for changesin dielectric constant (capacitancemeasurement) or density (hydrostaticmeasurement).

2 The two integral setpoint controllers arefully programmable to provide directpump control (adjustable hysteresis)and/or additional and Benefits Intrinsically safe signal input[EEx ia] IIC or IIB allows use withsensors operating inexplosion-hazardous area Zone 0 A family of sensors allows levelmeasurement in liquids and bulksolids under extreme conditions, e. g.: high pressure high temperature condensation aggressive material heavy Measurementsilometer FMC 671 ZFor liquids and bulk in dialogue with a computer as well asmanual remote operation.

3 Direct control andtwo-point control by integral setpoint +EndressThe Power of Know HowSilometer FMC 671 ZCalibration elements for on-site dialogue,LCD for measurements and parametersentered, mode indication of setpointcontrollers and test sockets on front SystemThe following figures show examples ofcomplete measuring systems. Capacitance rod probe withelectronic insert EC 37 Z or EC 47 Z Capacitance rope probe withelectronic insert EC 37 Z or EC 47 Z Hydrostatic sensor deltapilot S withelectronic insert FEB 17 Silometer Analog output current and voltagesignals Two limit signals from the continuousmeasurement, with adjustablehysteresis.

4 Capacitance rod probe withelectronic insert EC 17 Z Vibrating probe Liquiphant FDL 30/31 Capacitance rope probe withelectronic insert EC 17 Z Silometer Two setpoint signals, sameswitchpoint, but mode foreach relay independently common adjustable switchingdelay. Capacitance probe with electronicinsert EC 37 Z or EC 47 Z forcontinuous level measurement Vibrating probe Liquiphant FDL 30/31for maximum limit detection Silometer Analog output signals current andvoltage, proportional to level orcontents Setpoint signal, fully adjustable forthe continuous measurement, withadjustable hysteresis Maximum limit detection.

5 Capacitance probe with electronicinsert EC 37 Z or EC 47 Z forcontinuous level measurement Capacitance probe with electronicinsert EC 17 Z for calibrationcorrection, installed at a point that theproduct level passes most frequently Silometer Analog output signals current andvoltage Two setpoint signals from thecontinuous measurement, adjustableswitch levelmeasurement in aliquids tank or bulksolids siloLimit detection in aliquids tank or bulksolids siloCombination ofcontinuous levelmeasurement andlimit detectionContinuous levelmeasurement withautomatic calibrationcorrection (example 1)2 Measuring System(continued)

6 Hydrostatic sensor deltapilot S withelectronic insert FEB 17 forcontinuous level measurement Vibrating probe Liquiphant FDL 30/31for calibration correction, installed ata point that the product passes mostfrequently Silometer Analog output signals current andvoltage Two setpoint signals from thecontinuous measurement, adjustableswitch PrincipleInputsThe sensors for continuousmeasurement and the sensors for limitdetection are each connected to theinputs by unscreened two-wire Silometer supplies the electronicinserts (transmitters) in the sensor.

7 Aninterference-free PFM signal,proportional to level, is received. Forlimit detection with the Liquiphantvibrating fork probes, a frequencychange indicates that the desired levelhas been intrinsically safe signal inputs(input 1 for continuous measurement,input 2 for limit detection) aregalvanically isolated from the supplyand outputs. By coupling both inputs,automatic compensation of thecontinuous measurement mode ispossible. This means no re-calibrationis required on changing Functions for ContinuousMeasurement Linearisation of Vessel ShapeThe vessel curve describes thefunctional relationship between theheighthand the vessel represented on the by benchmarks.

8 Thesepoints are determined eitherempirically or by the vesselmanufacturer. A known curve can alsobe entered into the instrument. Themost common curve (for a cylindrical,horizontal tank) is also programmedinto the levelmeasurement withautomatic calibrationcorrection (example 2)PFM signalbetween andSilometer ofvessel shape3 Measuring Principle(continued) Automatic Calibration Correction forChanging Vessel ContentsThe zero of the level curve isdetermined by empty the level reaches the correctionprobe (at 60% in the diagram), thereference point K1 and therefore thegradient is the dielectric constant or the densityof the material increases, then theslope becomes less , K1 is reached on filling thevessel, before the level has reached60%.

9 Indication remains constant onrising level until the level reaches thecorrection probe. Point K3 is thenfixed, and the PFM signal is correction takes place both onrising and on falling Signals Theanalog output signalsarestandardised mA or mAcurrent and V or on calibration, outputsignals are proportional either to thelevel or to the contents of the linearisation curve for contentsindication on any vessel can beprogrammed the event of failure, the outputsignal may be programmed to drive 10% or +110%, or hold the lastmeasurement.

10 Two setpoint controllerseach with apotential-free change-over contact areintegral to the Silometer . Each canbe operated in minimum or maximumfail-safe mode with adjustablehysteresis. This allows selection for fulland empty alarm and also two-pointcontrol. The setpoint controllers areindividually energised either by input 1(continuous measurement) or by input2 (limit detection). Thefault alarmalso has apotential-free change-over a fault occur, then the relayde-energises. Sockets are located on the front panelto connect to the Commulog VU 260 Zfor on-site programming and for directaccess to the current Signal and FunctionIndication on the Instrument The LCD indicates the level orcontents of the tank or silo either inper cent or preset engineering selecting the appropriate matrixfield, other data may also bedisplayed, e.