Download - Nivelco Process Control Co., Inc.

NIVELCO in mechanical engineering automation (Hungary)Linamar Precision Part ManufacturingSite in Békéscsaba, HungaryLinamar Hungary is the Hungarian subsidiary of Canada'sleading automobile parts manufacturer. One of itsproduction halls is the PPM (Precision Part Manufacturing)in Békéscsaba, working in the place of the formeragricultural-machinery factory. Linamar produces steelautomotive parts in four main phases: casting, machining,purification by a high pressure cleaning system, thencoating on request. The high pressure cleaning systemwas instrumented with NIVELCO products.Instruments of the technologyEach workpiece comes under high pressure when it isinserted in the cleaner. Then the machine performs theneeded filtering-cleaning wash and finally rinses the workpiecebefore repeating the cycle.This washing procedure is under200 bar pressure, done with ahigh purity mineral oil.The filtering-cleaning CommonRail equipment removes anypossible small (0–3 μm) particlesor pollution remaining from themachining process. The washingliquidstorage tank of theCommon Rail equipment isinstrumented with two intrinsicallysafe mini compact typeNIVOTRACK MMA-504-6 Extransmitters. These models arethe same as the standard versionexcept for the 8 mm diameterprobe tube and the small 28 mmdiameter magnetic float. The 1” process connectionprovides a suitable solution for the small tanks used in thisapplication. The highly precise magnetostrictive transmittersare responsible for continuous level measurement ofthe washing liquid and perform level control of the tank,controlled by the 4–20mA output signals. A PLC receivesthe output signals and controls the filling-emptying pump.The accuracy of the NIVOTRACK transmitter is 1mmwhich fully meets the requirements of the measurement.Along with the level measurement instruments, someadditional NIVELCO devices have been installed as well.The local display of the measured levels is done byUNICONT PDF-501-6 Ex loop displays.The UNICONT PDF-s arein the local control room,quite far from the technologicalprocesses, so themeasurement results canbe read easily outside theproduction hall. Sensing,monitoring and displayingof the washing pressure isan essential parameter ofthe cleaning process.For this task, NIVOPRESSDBC-5H1-6 Ex hydrostatictransmitters with a SAP-200 display have been chosen asan excellent solution. Since the applied transmitters areexplosion-proof versions it wasnecessary to use 4 20 mA isolatedpower supply units for the transmitters.The newly developed UNICONTPGK-301-B Ex modules wereoffered for this purpose. NIPOWERPPK-331-1 power supply modulesgive supply voltage for theUNICONT PGK-s and thus for thetransmitters. Thanks to theseaccurate measurements, continuousoperation is ensured for the cleaningsystem and the efficiency ofthe whole production operationincreased significantly. In the frameworkof a future project, allmeasured data from the instruments will be integrated andprocessed by NIVELCO’s NIVISION process visualizationsoftware.Ferenc DékányRegional RepresentativeNIVELCO Co.fdekany@nivelco.com30