Radiometric Level Measurement gammasilometer FMG 671

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1 Technicl Informtion TI 9F//en Rdiometric Level Mesurement gmmsilometer Non-invsive level mesurement Intrinsiclly sfe signl circuit [x ib] IIC For scintilltion detector DG 57 The Gmmsilometer trnsmitter is 9" plug-in crd, here instlled in Monorck housing Appliction The Gmmsilometer trnsmitter is designed for non-invsive, rdiometric level mesurement with the DG 57 detector, nd mesures independent of chnging process conditions such s pressure, temperture, viscosity, corrosion or interference from fittings. It is used with vessels contining inflmmble, brsive, poisonous nd corrosive solids nd liquids; cid tnks, boilers, cement silos, bllst hoppers, cyclones, cupols, rotry furnces etc.. Since the mesuring system is fitted externlly, it cn lso be pplied in the food processing industry. Gmmsilometer trnsmitters possess intrinsiclly sfe sensor circuits to x ib IIC, x d or x de, depending on the detector, nd cn be used for pplictions in hzrdous res. Fetures nd Benefits For DG 57 scintilltion detectors from mm to 0 mm long nsures high sensitivity with low strength sources the locl dose rte is much less thn tht for point sources or ionistion chmbers but still gives excellent sttisticl ccurcy, even with low time constnts Digitl signl trnsmission Interference-free function with two-core instlltion cble up to 0 m Simple opertion with prmeter mtrix Uniform hndling s for ll Commutec trnsmitters Prcticl bckground functions Automtic countrte compenstion Automtic correction of clibrtion Commutec trnsmitter Simple connection to utomtic systems vi Rckbus Up nd downlod of dt. ndress user Nothing bets know-how

2 A B A B A B Mesuring System source continer QG 00/ x limit relys x lrm rely 0/4 0 0/ 0 detector DG 57 PCM signl 0 0 Gmmsilometer trnsmitter A B Level mesuring system comprising: Gmmsilometer Source continer QG 00/ Detector DG 57 Mesuring System A working system for level mesurement comprises: Gmmsilometer trnsmitter, QG 00 or QG source continer with Co 60 or Cs37 gmm source DG 57 scintilltion counter. Signl Input Circuit The Gmmsilometer supplies the power to the DG 57 detector which returns n interference-free pulse code modulted (PCM) countrte signl. The intrinsiclly sfe signl input is electriclly isolted from the trnsmitter supply nd the outputs. Scintilltion Counter DG 57 The DG 57 scintilltion counter ensures: highest sensitivity with lowest source strength. ndressuser hve mny yers of experience with rod scintilltion counters for level mesurement, lengths of up to 0 mm re vilble. For greter mesuring rnges or higher sensitivity, two detectors cn be connected in cscde by using second Gmmsilometer (in preprtion). Output Signls The Gmmsilometer hs stndrd 4 0 nd 0/ 0 nlogue output which is proportionl to level, two independent, freely progrmmble limit relys which cn be operted in minimum or mximum fil-sfe mode, nd n lrm rely. Self-Monitoring Function The Gmmsilometer continuously monitors ll signl lines. On fult condition: The lrm rely de-energises The nlogue output switches to -0% or 0% of the signl rnge or the trnsmitter continues mesurement The limit relys de-energise or follow the nlogue output. left Mesuring system for rnges from 4 m. A second trnsmitter cting s slve powers the second detector QG source QG source FTG 67 FTG 67 right Mesuring system for utomtic clibrtion compenstion Gmmpilot FTG 67 with DG 57- or DG 7/7 cts s externl limit switch x DG 57 detectors DG 57 detectors

3 Mesuring Principle source continer QG 00/ level % 35% Due to the non-liner reltionship between level nd normlised countrte the signl must be linerised. A stndrd chrcteristic for upright cylindricl vessels is stored in the trnsmitter Detector DG 57 0% 0 0 normlised countrte Level Mesurement When gmm rys penetrte mteril they re ttenuted. The degree of ttenution is dependent upon the density, the bsorption coefficient nd the thickness of the mteril. For level mesurement the bsorption coefficient nd density re normlly constnts nd the detected rdition count depends on the extent to which the detector is covered, The countrte is: t mximum when the pth to the detector is completely free (tnk empty) nd t minimum when ll the rdition hs to trvel through the mteril (tnk full). The mximum nd minimum countrtes re obtined when the trnsmitter is clibrted. Between mximum nd minimum the reltionship between level nd countrte is non-liner. The signl is linerised either by clling up stndrd chrcteristic or determining one individully. % 0 % level normlised countrte No Pulse rte Level % Individul Chrcteristics If the stndrd chrcteristic cnnot be used, the vessel chrcteristic cn be clculted by ndressuser on the bsis of drwing. The result is tble of normlised countrte versus level vlues which cn then be progrmmed into the Gmmsilometer. Alterntively the vessel cn be filled under controlled conditions nd the chrcteristic generted semi-utomticlly. Rdition Sttistics The emission of gmm rys by rdioctive source is governed by the lws of sttistics. For this reson the mesurement precision of gmm systems is dependent on the sttisticl vrition in countrte. Thnks to the sensitive DG 57 detector, the sttisticl vrition is smll, nd cn be further reduced by incresing the smpling or integrtion time τ or by using stronger source. Bckground Functions The Gmmsilometer is equipped with number of bckground functions which ensure ccurte nd relible level mesurement: The decy of the gmm source is ccounted for without ny ction on the prt of the opertor. The plusibility of successive countrte mesurements is checked nd if necessry, the switching of the relys is delyed The opertor is wrned when the ctivity of the source is no longer sufficient for relible mesurement. Individul lineristion using tbulr vlues 3

4 Opertion Mesured vlue disply showing % level t Br strip 0 0 Mtrix position indictor Frontpnel of showing operting nd disply elements Mtrix selection keys Prmeter entry keys Green communictions LD Lights when communicting Alrm rely LD Lights on fult condition, lrm rely de-energises Flshes on wrning, lrm rely remins energised 0 50 A B _ Limit rely LDs Red lit, rely de-energised Green lit, rely energised Communiction sockets for Commulog U 60 Z Dignosis sockets Check 0/4...0 signl here Configurtion t Front Pnel Gmmsilometer trnsmitters cn be configured t the front pnel. Six keys ccess prmeter mtrix, defined by verticl () nd horizontl () position, in which relevnt dt cn be entered The selected mtrix field nd prmeter re indicted in the LC-disply A continuous disply of level is vilble during opertion A 0-step LCD br strip indictes level s fucntion of the nlogue output. Opertionl Sttus The opertionl sttus of the trnsmitter is indicted by mens of six LDs which cn be clerly seen from distnce. The green nd red LDs in the centrl field indicte the limit rely sttus: red de-energised, green energised The green LD below lights when the Gmmsilometer is communicting with the Commulog U 60 Z hndheld terminl or the ZA computer gtewy The red LD in the dignostics field flshes to indicte wrning or lights on fult condition. Remote Configurtion The trnsmitter cn lso be configured by Commulog hndheld terminl or vi the Rckbus. The Commulog is plugged into the front pnel The dt exchnged re displyed with supplementry informtion on the lrge LC-disply. Dignosis The following possibilities exist for on-line dignosis: n error code cn be red from the mtrix position 90: the ssocited text cn be red with the Commulog U 60 Z. the current output cn be monitored t the sockets on the front pnel nlogue signls cn lso be simulted to check connected instrumenttion the trnsmitter cn be connected to personl computer vi commissioning nd service softwre, e.g., Commutool. Mesured vlues re ccessible t ll times with the Commulog U 60 Z hndheld terminl 4

5 Remote Control Personl Computer or other controller or configurtor e.g. PROFIBUS Rckbus PROFIBUScomptible progrmmble logic controller FMC 676 FTG 67 ZA 673 ON RACKBUS e.g. ZA 673 PROFIBUS The Gmmsilometer is connected to the process control system vi the Rckbus nd gtewy ZA gtewys for Modbus, Profibus nd FIP re vilble Sensors Actutors Process Control Systems Gmmsilometer trnsmitters re esily integrted into supervisory control systems. Prmeters re ddressed over the Rckbus by the ZA gtewy which presents them in pproprite formt to the connected network Up to 64 Commutec trnsmitters (mx. 8 mesuring points) cn be individully controlled nd operted on-line from the control room. ch is ccessed vi unique ddress Gtewys nd operting progrms re vilble for - vriety of field buses, - progrmmble logic controllers (PLC), - process control systems (PCS) nd - personl computers (PC). The resulting dilogue between supervisory controller nd subordinte trnsmitters mkes for sfer nd more flexible plnt orgnistion. Commutec operting progrms provide n overview of the process vribles for smll nd medium-sized plnts 5

6 Instlltion Mounting Rcksyst plug-in crds must be instlled outside explosive hzrdous res in rck or protective housing. ndressuser cn provide the following lterntives: 9" rck (84 P wide) for mounting up to trnsmitters in the control room lf 9" wide field housing with protection IP 65 for five 7 P trnsmitters nd power supply unit Monorck II housing (7 P) for single or multiple mounting on locl control pnel. Field housing Monorck II housing Detector Connection Use two-core instlltion cble, mx. resistnce 5 Ω per core If electromgnetic interference is to be expected: use screened cble, ground screen t the detector end. Note locl regultions when lying cble in hzrdous res. Connection of Instrumenttion The negtive terminls of the output signls nd 4 supply re connected to the circuit zero of the Gmmsilometer. For instruments with non-isolted input (eg. TA 470 Z): only one instrument cn be directly connected to the current output Severl instruments cn be connected to the voltge output in prllel, if their potentils re ll relted to the negtive terminl of the 4 supply There is no restriction on potentil-free instruments, except for the minimum or mximum lod. sfe re hzrdous re d b z TD u r u r u r L L- inputs z z4 Rckbus nlogue outputs limit rely ➀ limit rely ➁ Power lrm rely - r u r u r u d d4 Zener brrier - DG 57 Limit switch d0 d b0 d4 ZA communiction d d4 0/4...0 nlogue outputs b b4 0/...0 z TD z Cscde z4 z4 in preprtion z8 d8 b0 z d limit rely ➀ limit rely ➁ b4 z6 d6 lrm rely b8 z3 L- d3 L power supply Pin ssignment digrm for femle connector 6

7 Technicl Dt Dimensions in mm of the Gmmsilometer Rcksyst crd " = 5.4 mm P Construction Design: 9", 7 P, Rcksyst II* plug-in crd to DIN (urop crd) Front pnel: blck synthetic with blue field inly, grip nd mrkings Ingress protection (DIN ): Front pnel IP 0 Crd IP Dimensions: see digrm Weight: pprox. 0.3 kg Multipoint plug: conforming to DIN 4 6, Prt 3, Type F (5-pole) - Coding pins in positions nd 8 - Rck instlltion kit 5/ nvironment Operting temperture: 0 C...70 C Storge temperture: 5 C...85 C Climtic clss to DIN : KS ibrtion test, e.g. to GL, DN, LR f =.0 z to 3. z; = ± mm f = 3. z to z; 0.7 g lectromgnetic comptibility to N rdition N immunity nd NAMUR recommendtions lectricl Connection Power supply: 4 DC (0 30 ); residul ripple pp, within tolernce Supply current: mx. 60 Power consumption: mx. 3.8 W t 4 Protection ginst reverse polrity nd overloding. 3 U 8.4 Signl Inputs lectriclly isolted from the rest of the circuitry. Protection [x ib] IIC, [x d], [x de] vi detector Input for detector DG 57 Input for externl limit switch, e.g. Gmmpilot FTG 67, for utomtic clibrtion correction Zener brrier must be used for pplictions in hzrdous res output voltge U z t fult: mx. 6. short-circuit current I k : mx. 8 Second detector DG 57 in cscde with second Gmmsilomer (in preprtion) Signl Outputs Current output: /4...0 selectble, R L mx. 5 Ω - Test sockets on front pnel for potentil-free mmeter, R i 0 Ω oltge output: 0 0 / 0 selectble, R L min. 0 kω Limit switches Two independent relys ech with potentil-free chnge-over contct. Switch-on nd switch-off points fully djustble Fil-sfe mode selectble, minimum or mximum Fult lrm: rely with potentil-free chnge-over contct Switching cpcity: lternting current: mx..5 A, mx. 50 AC, mx. 6 A t cos ϕ>, mx. 3 A t cos ϕ 0.7 direct current: mx. DC, mx. W Rckbus: Budrte 9 bits/s, -core cble, bidirectionl Certifictes Intrinsic sfety: [x ib] IIC PTB No. x-93.c.45 X [x d ib], [x d], [x de] dependent upon detector DG 57 PTB No. x-85/05 *Type II Rcksyst crds cnnot be instlled in Type I Monorck housings 7

8 Product Structure Gmmsilometer Certificte PTB [x ib] IIC* ersion For one DG57 For two DG 57s - product designtion * [X d ib] IIC, [x de] IIC, [x d] IIC re determined by DG 57 detector Supplementry Documenttion Gmmsilometer, Gmmpilot System Informtion SI 06F//e QG 00/ Source Continers Technicl Informtion TI 94F//e DG 57 Scintilltion Counters Technicl Informtion TI 80F//e Gmm Rdition Sources Technicl Informtion TI 3F//e Gmmsilometer Operting Instructions BA 33F//e Rcksyst plnning hints for rckmounting or Rcksyst field housings nd self-dhesive connection schemtics Monorck II System ousing Technicl Informtion TI 83F//e Commulog U 60 Z ndheld Terminl Technicl Informtion TI 40//e ZA 67 Modbus Gtewy Technicl Informtion TI 48//e ZA 673 PROFIBUS Gtewy Technicl Informtion TI 6F//e ZA 674 FIP Gtewy Technicl Informtion TI 67F//e Commutec Operting Progrm Technicl Informtion TI 3//e ndressuser GmbCo. Instruments Interntionl P.O. Box D Weil m Rhein Germny Tel. (0 76 ) Tx Fx (0 76 ) /MTM ndress user Nothing bets know-how TI 9F//en/0.94 RÜ/C4.

Radiometric Level Measurement gammasilometer FMG 671 (P)

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