Technical Information VortexFlowMeasuringSystem prowirl77

1 TechnicalInformationTI 040D/06/enNo. 50084974 Safe Verified electromagnetic compatibilityaccording to IEC and NAMUR Every instrument hydrostatically pres-sure tested Sensor and electronics self-diagnostics with alarm function Proven capacitive sensor:high resistance to thermal shock,water hammer and vibration Sensor, meter body and bluffbody made of stainless steel,NACE MR 0175 conformAccurate Low measuring uncertainty:<1% (gas, steam)< (liquids) Wide turndown of up to 40:1 Every flowmeter wet calibratedFlexible One standard, compact flowmeter forall fluids and a complete processtemperature range of +400 C Available in pressure ratings up toPN 160/Cl. 600 Flanged and high pressure versionwith standard ISO face-to-face lengths(DN ) Wafer version with standard 65 mmface-to-face lengthUniversal HART communication for remotereading and configuration Fieldbus communication viaPROFIBUS-PA interface Operating under E+H Windowssoftware Commuwin II , can befully configured off-line Output signal simulationVortex Flow Measuring Systemprowirl 77 Reliable Flow Measurement ofGases, Steam and LiquidsHauser+EndressThe Power of Know HowMeasuring SystemApplicationsThe Prowirl 77 vortex flowmeter issuitable for measuring the volumetricflow of steam, gases and liquids from +400 C and up to a pressurerating of PN 160/ANSI Cl.

2 77 is commonly used for utilitymeasurements as well as in processapplications in various branches asChemicals, Petrochemicals, Power andDistrict 77 measures the volumetricflow at operating conditions. The E+HCompart DXF 351 flow computercalculates the flow in mass, energy orcorrected volume units from signals ofProwirl 77 and additional pressure andtemperature transmitters. If the processpressure and temperature at the measur-ing point are constant and accuratelyknown, Prowirl 77 can also be pro-grammed to display the flow rate inthese Prowirl 77 transmitters have thefollowing features: Self-monitoring electronics and sensor IP 67 / NEMA 4X ingress protection Built-in electromagnetic interferenceimmunity (EMC)VersionsThe Prowirl 77 transmitter is availablein the following versions: PFM (unscaled two-wire current pulse) mA/HART PROFIBUS-PAAll versions can be supplied eitherfor safe area use, or for hazardousareas as intrinsically safe ( Ex i ) orexplosion proof ( Ex d ) versions(For PROFIBUS-PA, Ex i or safe areaonly).

3 PFMThis is the most basic version, witha two-wire PFM pulse output forconnection to the E+H CompartDXF 351 flow computer. All settingsrequired can be made by using DIPswitches on the mA / HARTThis version has a mA currentoutput signal (with optional HART digitalcommunication). The transmitter is avail-able with either LCD and keys forlocal operation or as a blind with display and operatingkeys can also be set to output eitherscaleable voltage pulses (Open Collec-tor) or unscaled current pulses (PFM).After a loss of power supply the totalizerremains at the value last communication enables the instru-ment to be remotely configured andmeasured values to be off-line configuration can alsobe carried out using the Windows-supported E+H Commuwin II a PROFIBUS-PA version, a connec-tion to fieldbus systems according to theIEC 1158-2 international standard kbit/s is withCommuwin II(HART or PROFIBUS-PA version)Operation with theHART handheldterminalCalculations with theCompart DXF 351flow computerLocal operationwith LCDE xternal counterDisplay or processcontrol via mA signalE+H Cerabar S(Pressure)E+H Omnigrad(Temperature)Prowirl 77 Prowirl 77 can be usedas an individual meas-urement instrument oras part of a processcontrol BodyConstructionAll Prowirl 77 meters have the followingfeatures.

4 High resistance to water hammer insteam lines due to the steady fixing ofthe cast bluff body. Quality stainless steel casting, accord-ing to NACE MR 0175, all wetted partstraceable to Hydrostatically pressure tested T V preliminary testing (nominaldiameters DN )Prowirl 77 W(Wafer, DN )This space-saving wafer body is 65 mmwide and mounted easily with the helpof a mounting set (see page 7). Thisenables easy and accurate centering ofthe meter body in the 77 F(Flange, DN , bigger nominaldiameters on request)This design offers standard ISO face-to-face lengths (DN ).Prowirl 77 H(High pressure, DN )This sensor is designed for the useat high process pressures up toPN 160/Cl. 600 and features standardISO face-to-face lengths as Prowirl 77 flowmeters are subjectto wet calibration before leaving use as a quality-relevant measure-ment point (ISO 9000), Prowirl 77 isavailable with calibration procedurestraceable to EN 45001 and correspond-ing internationally recognisedcertificates according to regulations ofEA (European Organisation for theAccreditation of Laboratories).

5 Prowirl 77 W(wafer)Prowirl 77 F(flanged)Prowirl 77with local programmingProwirl 77blind versionti040y02 Prowirl 77 H(high pressure)Measuring system Prowirl 773 FunctionCapacitive SensorThe sensor of a vortex flowmeterhas a decisive effect on the efficiency,ruggedness and reliability of the entiremeasuring proven E+H patented capacitivemeasurement technique (in more than50 000 installations world-wide) isdesigned into the Prowirl sensor is mechanically balanced sothat pipeline vibrations are directlyeliminated and do not have to be filteredout electronically. Prowirl 77 is in everyaxis insensitive to vibrations up to atleast 1 g in the full frequency region to500 specifications also apply to themost sensitive Y axis (see Fig. below),the axis in which the sensor detectsvortex high sensitivity of the sensor guaran-tees measuring ranges that start at lowvalues even with low fluid densities,enabling a wide design and position of the capaci-tive sensor behind the bluff body en-sures that it is especially resistant towater hammer and temperature shockin steam PrincipleThe operating principle is based on theKarman vortex street.

6 When fluid flowspast a bluff body, vortices are formedalternately on both sides of the bodyand are then shed by the flow. Pressurechanges are created by the vorticeswhich are detected by the sensor andconverted into electrical signals. Withinpermissible operating limits (see Techni-cal Data , page 23) the vortices areshed at very regular intervals so that thefrequency of shedding is proportionalto the flow K-factor is used as a constant ofproportionality:K-factor =The K-factor is a function of the geome-try of the flowmeter and within appli-cation limits is independent of flowvelocity and of the fluid propertiesviscosity and density. It is thus alsoindependent of the type of fluid to bemeasured, whether it is steam, gas primary measuring signal is alreadydigital (frequency signal) and linearlyproportional to the flow rate. The K-fac-tor is determined in the factory by a wetcalibration after the production processand is not subject to long-term or zeropoint drift.

7 The flowmeter contains nomoving parts and requires no dm[]3ti040y03ti040y19 YaxisZ axisXaxisSensorGasket4 Planning andInstallationInlet an dOutlet SectionsWhere possible, the vortex flowmetershould be mounted upstream of anyflow disturbances such as elbows,reducers or control valves. The longestsection of straight pipe should bebetween the disturbance and theflowmeter. The diagrams on the rightshow the minimum section of straightpipe required downstream from thedisturbance as a multiple of the pipediameter (DN). Where two or moredisturbances are located upstream ofthe flowmeter, the longest recom-mended upstream pipe section is tobe section of straight pipe downstreamfrom the flowmeter should be of suffi-cient length so that the vortices candevelop ConditionerIf it is not possible to observe the inletsections specified above, a speciallydeveloped perforated plate flowconditioner can be installed as shownon the right.

8 The flow conditioner is heldbetween two piping flanges and centredwith the flange a rule, it also reduces the inlet sec-tion required downstream from the flowdisturbances to 10 x DN, maintainingfull measuring when using theFlow Conditioner p [mbar] = [kg/m3] v2[m/s] Example with steam:p = 10 bar C = kg/m3v=40 m/s p = kg/m3 (40 m/s)2= mbar Example withH2O condensate (80 C) =965 kg/m3v= m/s p= 965 kg/m3 ( m/s)2= mbarti040y04 InletOutletReductionExpansion90 elbow orT-piece2x 90 elbows2x 90 elbows3-dimensionalFlow conditionerControl valveVortex flowmeters require a fully developed flow profile as a prerequisite for accurateflow measurement. The following instructions must therefore be observed wheninstalling Prowirl 77 in the body inner diametersThe process piping internal diameter of a given nominal size varies depending onthe class of pipe (DIN, ANSI Sch40, Sch80, JIS etc.)

9 When ordering, part of theorder code specifies the type of piping into which the meter will be installed, andthis same piping type is used at the factory for the wet calibration. Both Prowirl 77 W(wafer) and Prowirl 77 F (flanged) can be used in DIN, ANSI Sch40 and JIS Sch40piping. Sch80 piping is available for the flanged (Prowirl 77 F) and high pressure(Prowirl 77 H) andInstallationOrientationThe Prowirl 77 can generally bemounted in any position in the arrow showing the direction of flow ismarked on the meter should flow upwards in verticalpipelines (Position A), in order toensure that the pipeline is always horizontal pipelines, positions B, Cand D are possible. With hot piping( steam), position C or D must beselected in order to respect the maxi-mum permissible ambient temperaturefor the electronics. (For ambient tem-peratures, see page 24).

10 Pressure an dTemperatureMeasuring SensorsPressure and temperature measuringinstruments are to be installed down-stream from Prowirl 77 so that they donot affect the proper formation InsulationWafer/Flange dversionPipeline insulation is often necessary toprevent energy loss in hot insulating Prowirl 77, ensuresufficient pipe stand surface area isexposed. The exposed area serves as aradiator and protects the electronicsfrom InsulationHigh Pressure VersionThe pipe stand must be free frominsulation in order to guarantee tempera-ture radiation and therefore to keep theelectronics from as afunction of fluidtemperatureti040y06 PressuretransmitterTe m p e r a t u r etransmitterMounting the pressureand insulationwafer/flanged versionti040y38 Maximum insulation height isthe screw seatHatched area mustbe free of insulationmaterialPiping insulationhigh pressure version6 Mounting SetWafer-style flowmeters can beaccurately centred using a mountingset which consists of:1 Bolts2 Washers3 Nuts4 Centering rings5 GasketsMinimum SpacingWhen servicing or connecting the Flowjack flow simulator, it is first neces-sary to unplug the electronics housingfrom the pipe stand.