Toshiba GF642 Manual

Field Intelligent DeviceELECTROMAGNETIC FLOWMETERGF642/LF622(Separate type)20” to 80”(500mm to 2000mm)EJL-146CIntroductionThe electromagnetic flowmeter uses Faraday’s Law ofelectromagnetic induction to measure the process flow.The device consists of two units: a detector, throughwhich the fluid to be measured flows and in whichlow-level signals proportional to flow rates areobtained; and a converter, which supplies excitationcurrent to the detector, and amplifies the signals fromthe detector and then processes and converts the signalsinto the 4–20 mAdc current signal or communicationsignal. Combined with a multi-functional converterLF622 (separate type) equipped with its patentedNoise-Sentry original noise- suppression circuit andadvanced algorithms. The GF642 has a very hightolerance to noise, giving the unit a very stable outputeven for slurry fluid measurement. IR (Infrared)switches enable parameter setting of the converterwithout removing the cover. Flow direction can be set ineither way.The AF900 hand-held terminal (HART*1 communicator)can be used to communicate with the flowmeter from aremote place. PROFIBUS-PA*2 or Modbus*3 interfaceis available as an option.*1: HART protocol (Highway Addressable Remote Transducer)is a communication protocol for industrial sensorsrecommended by the HCF (HART CommunicationFoundation).*2: PROFIBUS is the communications protocol for factory andprocess automation that the PROFIBUS Organizationrecommends. Instead of analog control with a conventionalanalog signal (4-20 mA), it is fieldbus which digitizes allsignals. Flowmeters support PROFIBUS-PA.*3:Modbus is the communication protocol that Modicon Inc.developed. Physical layer is RS485. General SpecificationsMeasurement range: (measuring range by flowrate conversion)Meter size From 20” to 80”(500mm to 2000mm )Measuring range 0-1.0ft/s to 0-32.8ft/s(0-0.3m/s to 0-10m/s)Accuracy: (Accuracy when combined with theconverter LF622)Flow rateFlow speed of full scale1.0 ～ 3.28 ft.s(0.3 ～ 1.0m/s)3.28ft/m ～ 32.8ft/s(1.0 ～ 10m/s)0 ～ 100%FS ±0.8% FS ±0.5 %FSNote: The accuracy above is measured understandard operating conditions using theweighing method at Toshiba admittedflow calibration facility.Fluid conductivity:5μS/cm minimumFluid temperature:14 to 140 °F (-10 to +60℃): 20” to 36” (500mm to 900mm)14 to 104 °F (-10 to +40℃): More than 40” (more than 1000mm)Power cable Signal and Excitation cableConverter (LF622)Detector (GF642)Figure1. ConfigurationFigure2. GF642 FlowmeterCertificationnumberZ01207