Radiometric Level Measurement gammapilot FTG 671

1 TechnicalInformationTI 177F/00/enApplicationThe gammapilot FTG 671 transmitter isdesigned for non-invasive, Level limit detectionin containers - mixers, reactors,hoppers, silos, tanks - with inflammable,abrasive, poisonous and aggressivebulk material and liquids, in acidtanks, boilers, cement silos, ballasthoppers, cyclones, cupolas, rotaryfurnaces Thanks to the fact that themeasuring system is fitted externally, italso finds application in the foodprocessing transmitters may also beused for applications in explosionhazardous areas, and possessintrinsically-safe sensor circuitsconforming to EEx ib IIC, or EEx d IIC,EEx de IIC depending on the and Benefits Suitable for scintillation detectorDG 57 or Geiger-M ller countersDG 17 or DG 27 Uses lowest possible source activitywith DG 57/100 mm or longer Digital signal transmission- Interference-free function withtwo-core installation cable up to1000 m Intrinsically safe sensor circuits- Ex-protection withoutZener barriersapproved as overspill protection(VBF, WHG Germany) and for usein explosion hazardous areas Simple operation with parametermatrix- Uniform handling as for allCommutec transmitters Practical background functions- Automatic compensation of sourcedecay- Automatic adjustment of switchpoint Commutec transmitter- Simple connection to automaticsystems via Rackbus- Up- and download of dataRadiometric Level Measurementgammapilot FTG 671 Non-invasive, Radiometric limit detectionIntrinsically safe signal circuit [EEx ib] IIC/ATEX II (2)

2 GDFor scintillation or Geiger-M ller detectorThe GammapilotFTG 671 transmitter is a19" plug-in card, shownhere in Monorack IIhousingHauser+EndressThe Power of Know HowMeasuring SystemMeasuring SystemA working system for Level limit detectioncomprises: gammapilot FTG 671 transmitter, QG 020 or QG 100 source containerwith Co 60 or Cs137 gamma source DG 17, DG 27 Geiger-M ller counteror DG 57 scintillation Counter DG 57 Most Measurement systems use the DG57 scintillation counter, thus ensuring: highest sensitivity with lowest source +Hauser have many years ofexperience with rod scintillation countersand the new DG 57/100 mm counter hasbeen specially developed for limitdetection. Sensitivity can be furtherincreased by using the DG 57/400 mm or Input CircuitThe gammapilot supplies the power tothe detector and, depending ontype, the detector returns aninterference-free pulse frequency orpulse code modulated countrate intrinsically safe signal input iselectrically isolated from the transmittersupply and the SignalsThe gammapilot FTG 671 has two limitrelays which can be operated with freelyadjustable hysteresis independently ofeach other in minimum or maximumfail-safe FunctionThe gammapilot FTG 671 continuouslymonitors all signal lines.

3 On faultcondition: An alarm relay with potential-freechangeover contact de-energises In default condition the limit relays Level detectionapplication showing thearrangement of thesystem componentssource container,detector and transmitterFTG 671 VibrationchannelMaximumleveldetectionMin imumleveldetectionFeed rate 1barrel/2sFull moveforwardHalf full arerejectedFTG 671 FillingstationConveying limestoneGamma radiationbarriers control thedrying processAutomatic filling of beerbarrelsThe Level is checked asthe barrels move pastthe 671transmitterSourceDetectorMeasurement PrincipleGamma-Ray AbsorptionRadiometric Level Measurement relies onthe fact that gamma rays are absorbedas they penetrate a material. Theattenuation of the radiation is dependentupon the density , the thickness d ofthe material as well as the linearabsorption factor . This in turn isdependent on the material and gammasource. The attenuation is calculatedfrom the formulaFs= e.

4 DThe radiation also decreases with thesquare of the distance between sourceand DetectionFor limit detection , and d areconstants and the detected radiationlevel depends upon the presence or notof the penetrated material: The countrate is at a maximum whenthe path to the detector is completelyfree and at a minimum when all the radiationhas to travel through the material andis maximum and minimum countratesNmaxand Nminare obtained when thetransmitter is calibrated, whereby theirdependency is given by:Nmin= Nmaxe ..dThe switch points can be set anywherewithin these two countrates, which arenormalised to produce the end values 0and StatisticsThe emission of gamma rays by aradioactive source is governed by thelaws of statistics. For this reason themeasurement precision of gammasystems is dependent on the statisticalvariation in countrate. The variance, degree of variation betweenmeasurements, depends upon the timeinterval chosen.

5 The precision of themeasurement depends on the chosenconfidence Level - 1 , 2 or 3 . For acountrate of N pulses per second: =N; % confidencelevel 2= 2N; % confidence Level 3= 3N; % confidence levelNormally, a confidence Level of 2 isused. The statistical variation can bereduced by increasing the sampling orintegration time :Statistical variation=2N For limit switching the integration timecorresponds to the response time of FunctionsThe gammapilot FTG 671 is equippedwith a number of background functionswhich ensure accurate and reliable limitswitching. Thus, for example, thestatistical fluctuations in countrate anddecay of the gamma source describedabove are accounted for without anyaction on the part of the calibration, the FTG automaticallysets the switch points to preset values. Itwarns the operator if incorrect limits areentered, and when the activity of thesource is no longer sufficient for fluctuationin countrateChange in countrateas product movesthrough barrierCountrate due to residualand backgroundradiationtimeCountrateNmaxNmin 1000 Principle limit detectionby gamma radiographyOperationConfiguration at Front PanelGammapilot FTG 671 transmitters canbe configured at the front panel.

6 Six keys access a parameter matrix,defined by a vertical (V) and horizontal(H) position, in which relevant data canbe entered The selected matrix field andparameter are indicated in theLC-display A display of normalised countrate,0-100, is available during operationRemote ConfigurationThe transmitter can also be configuredby a Commulog handheld terminal or viathe Rackbus. The Commulog is plugged into thefront panel The data exchanged are displayedwith supplementary information inplain language on the the Commulog is unplugged,Racksyst operation mode is StatusThe operational status of the transmitteris indicated by means of six LEDs whichcan be clearly seen from a distance. The green and red LEDs in the centralfield indicate the limit relay status:red de-energised, green energised The green LED below lights when theGammapilot is communicating with theCommulog VU 260 Z handheldterminal or the ZA computergateway The red LED in the diagnostics fieldflashes to indicate a warning or lightson fault following possibilities exist foron-line diagnosis: an error code can be read from thematrix position V9H0: the associatedtext can be read with the CommulogVU 260 Z.

7 The transmitter can be connected to apersonal computer via commissioningand service software, , value display showingnormalised countrate at V0H0 Limit relay LEDs Red lit, relay de-energised Green lit, relay energisedParameter entry keysAlarm relay LED Lights on fault condition,alarm relay de-energises Flashes on warning,alarm relay remains energisedMatrix selection keysCommunication sockets forCommulog VU 260 ZGreen communications LED Lights when communicatingMatrix position indicatorFront panel ofGammapilot FTG 671showing configurationand display elementsThe Commulog VU 260 Zprovides instant access tomeasured dataRemote ControlProcess Control SystemsGammapilot FTG 671 transmitters areeasily integrated into supervisory controlsystems. Parameters are addressed over theRackbus by the ZA gatewaywhich presents them in appropriateformat to the connected network Up to 64 Commutec transmitters ( measuring points) can beindividually controlled and operatedon-line from the control room.

8 Each isaccessed via a unique address Gateways and operating programs areavailable for a variety of fieldbuses,programmable logic controllers (PLC),process control systems (PCS) andpersonal computers (PC).The resulting dialogue betweensupervisory controller and subordinatetransmitters makes for a safer and moreflexible plant logiccontrollerRackbusPersonal Computeror other controller or 673 SensorsActuatorsThe GammapilotFTG 671 communicateswith a supervisorycontroller via thetwo-core Rackbus and aZA computergatewayThree possibilities exist:Modbus, Profibus or operatingprograms provide anoverview of processvariables for small andmedium-sized plantsInstallationMountingRacksyst plug-in cards must be installedoutside explosive hazardous areas in arack or protective +Hauser can provide thefollowing alternatives: 19" rack (84 HP wide) for mounting upto 12 transmitters in the control room Half 19" wide field housing withProtection IP 65 for five 7 HPtransmitters and a power supply unit Monorack II housing (7 HP) for singleor multiple mounting on a local EMC reasons we advise you to usespecial guide rails with metal clips whenthe plug-in card is installed in the fieldhousing or subrack.

9 This connents theinstrument input filter to the housingDetector Connection Use two-core installation cable,max. resistance 25 per core Use shielded cable: ground at thedetector end if electromagneticinterference is to be expected. Note local regulations when layingcable in hazardous of InstrumentationThe circuit zero of the gammapilot isconnected to the negative terminal ofthe 24 V supply. One of two electricallyisolated signal inputs can be used: Inputs d2 and d4 are for PCM signalsfrom DG 57 scintillation counters Inputs z2 and z4 are for PFM signalsfrom Geiger-M ller counters DG 17resp. DG II housingRelay 1 Alarm relayPower supplyRelay 2 Relay 1 Relay 2 Alarm relayNon Ex-areaDC supplyEx-areaRackbusInputs orPCMPFMNon Ex-areaConnection diagram forGammapilot FTG 671 Remote dialogTechnical DataEnvironment Operating temperature: 0 +70 C Storage temperature: -20 +85 C Climatic class to DIN 40 040: KSE Electromagnetic compatibility (EMC):Emitted interference to EN 61326;Class A equipment;Immunity to interference to EN 61326;Annex A (industry sector) andNAMUR EMC Recommendation(NE 21)Construction Design: 19", 7 HP, Racksyst II* plug-incard to DIN 41 594 (Europa card) Front panel: black synthetic with bluefield inlay, grip and markings Ingress protection (DIN 40 050):Front panelIP 20 CardIP 00 Dimensions: see diagram Weight: approx.

10 Kg Multipoint plug: conforming toDIN 41612, Part 3, Type F (25-pole)Coding pins in positions 2 and 7 Electrical Connection Power supply: 24 V DC (+6 V);- residual ripple 2 V, within tolerance Supply current: max. 135 mA Power consumption:max. W at 24 V, max. W at 30 V Signal inputs:Electrically isolated from the rest of Protection EEx ib IIC, EEx d IIC orEEx de IIC for DG for DG17 Outputs Two independent limit relays each witha potential-free change-over contact Freely selectable switchpoint andhysteresis Fail-safe mode: maximum or minimumselectable Third alarm relay with potential-freechange-over contact for faultindication Max. switching capacity:- A, 250 VAC,- 300 VA (cos = ),- 600 VA (cos = 1)- or 100 VDC, 100 WDetectors DG 57 rod scintillation counter DG 17, DG 27 Geiger-M ller countersCertificates Explosion protection: [EEx ib] IIC /ATEX II (2) GDPTB No. X Explosion protection: EEx d ib IIC,EEx d IIC and EEx de IIC,dependent upon detector DG 57 PTB No.