Lưu Lượng Kế Điện Từ

The  electromagnetic  flowmeter  uses Faraday’s Law  of electromagnetic induction to measure the process flow. The  device  consists  of  two  units:  a  detector,  through which  the  fluid  to  be  measured  flows  and  in  which low-level  signals  proportional  to  flow  rates  are obtained;  and  a  converter,  which  supplies  excitation current  to  the  detector,  and  amplifies  the  signals  from the detector and then processes and converts the signals into  the  4–20 mAdc  current  signal  or  communication signal.  Combined  with  a  multi-functional  converter LF622  (separate  type)  equipped  with  its  patented Noise-Sentry  original  noise-  suppression  circuit  and advanced  algorithms.  The  GF642  has  a  very  high tolerance  to noise, giving  the unit  a very  stable output even  for  slurry  fluid  measurement.  IR  (Infrared) switches  enable  parameter  setting  of  the  converter without removing the cover. Flow direction can be set in either way. The AF900 hand-held terminal (HART*1 communicator) can be used to communicate with the flowmeter from a remote  place.  PROFIBUS-PA*2    or Modbus*3  interface is available as an option. 
*1:    HART protocol  (Highway Addressable Remote Transducer) is  a  communication  protocol  for  industrial  sensors recommended  by  the  HCF  (HART  Communication Foundation). 
*2:  PROFIBUS  is  the  communications  protocol  for  factory  and process  automation  that  the  PROFIBUS  Organization recommends.  Instead  of  analog  control with  a  conventional analog  signal  (4-20  mA),  it  is  fieldbus  which  digitizes  all 
signals. Flowmeters support PROFIBUS-PA. 
*3:Modbus  is  the  communication  protocol  that  Modicon  Inc. developed. Physical layer is RS485.