Q = OCM Pro. Very Accurate Flow Measurement in partially and full filled Pipes and Channels

Transcription

1 Q = Σ i i i OCM Pro Very ccurae Flow Measuremen in parially and full filled Pipes and Channels

2 OCM Pro New in he Field of Flow Measuremen Measuremen of he Real Flow Velociy Profile Spaial llocaion of Single Velociies Cross Correlaion wih igial Paern Recogniion Very High ccuracy No Calibraion required 2 No Elecrodes, no Conduciiy required bsoluely Zero Poin sable and rif-free Measuremen in Parially and Fullfilled Channels and Pipes Measuremen in all Profiles Easy o assemble, no addiional Consrucions Measuremen in highly conaminaed and abrasie Media For Use in difficul pplicaions oo Simple, Mulilingual and Menu-drien Parameer Seing Large Graphical Backli isplay Ex-Zone 1 pproal Complee Measuremen aa Sorage on Compac-Flash Q Modem and Radio Connecion Measuremen Principle The magniude >>Flow "Q"<< canno be measured direcly. The principle for flow calculaion is based on he following general equaion: Q = = weed cross-secional rea = aerage Flow Velociy The weed cross-secional area depends on he secion profile and he flow leel. In fully filled pipes, e.g. pressure pipes, he cross-secional area is always he same and hus can be enered as a consan. In case of a parial filling he flow leel is deermined by an exernal or inegraed leel measuremen deice. Σ Then he weed cross-secional area is calculaed by aking he secion profile ino accoun. Flow Leel Measuremen Based on ulrasonic-echo-sounding principle he flow heigh (flow leel) is measured [] eiher in he medium from he boom up or from aboe [B] by air ulrasonic. In boh cases he boundary surface waer/air (waer surface) is recognized and he sound rael ime beween sensor and waer surface is measured. The flow heigh, which is deermined as a resul from ha, is proporional o he measured ime. [B] [] This mehod sands ou for is accuracy and long-erm sabiliy. Measuring from he boom up is paricularly adanageous since no dead zones aboe he waer surface mus be aken ino accoun. Thus, he measuremen can be carried ou een in parially filled pipes wihou dome ops up o full filling. Foam or any oher subsances on he waer surface do no affec he measuremen resul.

3 Flow Velociy Measuremen Scan Layers (Gaes) V V aerage V max n ulrasonic conerer sends a brief ulrasonic pulse ino he medium. This pulse is refleced by paricles or gas bubbles in he medium. The sensor works in pulse-echomode. This means ha he ulrasonic conerer swiches o receie mode immediaely afer emiing a pulse and hen receies he refleced echo as a characerisic paern. The echo paerns from he firs scan are digially sored. E4 E Scan Windows 4 o 16 n E1 - E4 = Reflecing Paricles E1 1. Scan Scan Window 3 Scan Window 2 Scan Window 1 By using he cross correlaion mehod now he echo paerns of 16 differen ime slos are checked for agreemen. The cross correlaion also proides he paern s emporal moemen in he second scan in comparison wih he firs scan. This emporal moemen can be conered direcly o he flow elociy in he scan windows respecie o he insolaion angle. Formula + T / 2 V x y ϕ () (-) ( ) lim 1 fg τ = f() g( ) d T + τ 1. Signal eecion (1. Scan) 2. Signal eecion (2. Scan) Signal Ealuaion 0 Scan Window 1 E1 T / 2 Scan Window 2 Scan Window 3 This een is repeaed up o 2000 imes per second. Using a ery powerful signal processor (SP) he respecie elociies in he 16 spaial precisely allocaed measuremen windows are deermined which represen he flow profile of he measuremen place. 1 Hence, i is possible o obain highly accurae measuremen alues wihou addiional calibraion. In complex or ery large channel profiles full-coerage flow profiles can be inesigaed and ealuaed by placing 2 or 3 sensors respeciely. 2 3 E Scan Windows 4 o 16 n E4 E1 - E4 = Reflecing Paricles E1 2. Scan Scan Window 3 Scan Window 2 Scan Window 1 1. Signal eecion (1. Scan) 2. Signal eecion (2. Scan) Signal Ealuaion 0 Scan Window 1 Scan Window 2 Scan Window 3 E1 1 E1 2 3 E4 In he second scan 0.5 o 4µs laer anoher ulrasonic pulse is emied and he receied echo paerns are sored as well. The run ime beween he momen of recepion and ransmission deermines he paricles posiion wihin he flow secion. h max i Q 3

4 OCM Pro Transmier Oeriew of he mos imporan Feaures: Large graphical backli display Graphical and numerical alue display Graphical display of he hydraulic condiions a he measuremen place Use of mos modern SPs (digial signal processors) and 32 Bi conroller echnology Up o 4 analog inpus 0-10V or 4-20m RS232 inerface Up o 4 digial inpus Ulrasound Sensor, P-06 pproal Ex zone 1 1 h 2 3 Ex-ersion: addiional 4-20m inpu wih power supply Up o 4 analog oupus 4-20m Up o 5 relays (cener-zero relays) 12 bi inpus and oupus Poenial-free isolaed inpus and oupus Inegraed 3-poin sep conroller wih freely programmable flush funcions, quick close funcion and slide monioring Pressure Probe, NiuBar Plus Torque, Sop Swich from Conrol Slider Sensor 1 Sensor 2 Sensor 3 exernal Heigh E1 E4 aa Bus SP Menu drien user inerface; he user only eners channel shape and dimensions PI- Conrol isplay CPU Memory Card Memory Card (Flash-Card), up o 32MB, for daa sorage and daa ransmission o PC aa ransmission ia modem or radio (GSM, aailable soon) Enclosure: wall moun, panel moun and 19" plug-in uni Oupu: Flow, Velociy, Flow Leel/Heigh, Temperaure Oupu: Limiing Conacs, Quaniies, Errors Conrol Slider rie exernal Conrol Se Poin Value exernal analog Signals E1 E4 Memory Card OCM/M0 4

5 Sensors xial Velociy Profile Flow elociy sensors wih or wihou inegraed flow leel measuremen are aailable. epending on he applicaion arious consrucions are used. Wedge sensors (mouse) for mouning in flumes and open channels as well as pipe (inserion) sensors for mouning in seel, concree and plasic pipes. The mouning expenses are exremely low. In case of upgrading seps huge inesmen coss can be saed since he measuremen place does no need o be modified. For measuremen in aggressie media, e.g. chemical indusry wasewaer, high resisan sensors are aailable. Isoel Char Conroller 3- Velociy Profile The OCM Pro is opionally equipped wih a 3-poin sep conroller, which was funcionally opimized for he requiremens in he wasewaer field. Thus, quick close funcion and auomaic relocaion are sandard, as well as selecable exernal/inernal se poins and slider monioring. For measuremen secions exremely prone o conaminaion a freely programmable flush algorihm can be aciaed, which auomaically remoes sludge accumulaion on he sensors. 5

6 OCM Pro Sorage (aa Logging) If he OCM Pro is equipped wih a Flash Card, all recorded alues as well as 4 addiional exernal analog signals can be sored in freely selecable cycles. The daa are sored as x-files and hence can be ealuaed and processed wih curren sofware, e.g. Excel or similar. The 32 MB sorage deph enables up o 10 years of memory capaciy per cycle and inpu number. Raw aa Programming The programming is as easy as a child s play. The comprehensie windowslike user inerface in addiion wih he large graphical display guides he user seing up he sysem hrough he menu. Programmed seings are displayed graphically as sandard, e.g. isplay aa processed wih NICOS Process Conducing Sysem RUN PR I/O CL EXTR measuremen place name subdiide geomery channel shape(s) channel geomery 3 profiles Qmin l/s r r= m h= m H= m h H sludge leel m The large backli display allows for easy and obious programming as well as simply requesing inpus, oupus, sensor daa, echo profiles and much more. RUN PR I/O CL EXTR sensors h-echo profile h=0.122m (150.4us) Thus, incorrec programming is almos impossible. ccess proecion opions o preen unauhorized or wrong adjusmen are sandard. max a = us This enables he user o ge informaion abou he sysem saus, errors, day quaniies, memory capaciy, conroller parameers and more a any ime. For his reason eenual roubleshooing is easily faciliaed. 6

7 danages in relaion o oher Mehods The OCM Pro sands ou wih a high accurae flow elociy deerminaion. The measured elociies can be accuraely allocaed spaially and are displayed on a large backli display. This makes i easy o hydraulically assess he seleced measuremen place and criical applicaions are recognized or aoided een by an inexperienced user. The sysem can be applied in exising channels, pipes, consrucions and more. ddiional modificaions, hroas, inered syphons or similar consrucions are compleely unnecessary. For ha reason i is possible o insall an accurae and reliable sysem een in large channels in no ime a low cos and wihou addiional consrucions. The sysem operaes wih a high elociy resoluion. Een lowes medium moemens wihin a range of a few mm/s are recognized and ealuaed safely in conras o common magneic inducie sysems. epending on he channel geomery measuremen dynamics up o 1 : a parial filling are possible. The OCM Pro is based on ulrasonics. Thus, i is independen of medium conduciiy or elecrode coering by oil films or baceria coaing. The sysem is compleely drif-free. Sensor cleaning is no necessary. Successful Operaion NIVUS measuremen echnique is synonymous for innoaion and accuracy in he wasewaer field. Guide Tube N 100, Lengh 8m Thanks o decades of experience and applicaion know-how of our engineers, echnicians and auhorized saff een almos impossible applicaions mean a challenge o us. Where oher esed sysems failed, we succeeded in creaing uncommon soluions which compleely saisfied our cusomers. Recirculaion Pipe N800 Jus alk wih us. 7

8 Specificaions subjec o change NIVUS GmbH Im Taele Eppingen Tel.: +49 (0) / Fax: +49 (0) / info@nius.de Inerne: NIVUS G Haupsrasse 49 CH Glarus Tel.: +41 (0) 55 / Fax: +41 (0) 55 / swiss@nius.de Inerne: NIVUS Sp. z o.o. ³ugie Ogrody 8 PL Gdañsk Tel.: +48 (0) 58 / Fax: +48 (0) 58 / poland@nius.de Inerne: NIVUS France 14, rue de la Paix F Sessenheim Tel.: +33 (0) Fax: +33 (0) france@nius.de Inerne: NIVUS merica Inc Yonge Sree Uni 35B, Suie 212 Richmond Hill, Onario L4C 3C7, Canada Tel.: Fax: america@nius.de Inerne: