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DFD420 Pulse Divider and Transmitter

The DFD420 pulse divider and transmitter has two basic functions: Pulse input to pulse output converter, by means of a programmable divider factor. Programmable frequency to current converter. It adapts to the most Nixon Flowmeters, series COVOL and TM flowmeters. Likewise, it can be connected to other sensors whose output signal is a potential free contact or a pickup.


Automated process control in any industry with flow rate or volume control for interfacing with PLC and other instruments. Interface with PLC inputs. Interface with analog indicators or alarms. 


  • Very simple to use, just select frequency for full scale output.
  • Direct interface to Turbines, Covol etc.
  • Fully programable by user.
  • No batteries needed, BCD switch programming.
  • Standard DIN rail mounting.
  • Connections with screw terminals for easy installation and maintenance.
  • 0-20 mA, 4-20 mA, 0-10 V, 0-5 V, 2-10 V or 1-5 V output options.
  • Also available 0-24 mA option.
  • Adaptive filter for stable output
  • 12 or 16-bit resolution on analog output.

Technical Data

  • Power supply 110, 220, 240, 24 V ac 50-60 Hz 24 V dc
  • Power consumption < 1 VA
  • Precision 0.2 % Full Scale
  • Temperature range -10oC...... 60oC 
  • Frequency range 0.1.....9999 Hz for full scale
  • Cutout frequency 0.04 Hz
  • Input signal TM-44 20 mV...3 V ac, 0....2000 Hz
  • Input signal COVOL Reed contact, 0.... 100 Hz
  • Consult Tecfluid for other inputs
DFD420 Pulse Divider and Transmitter




  • Compact size
  • Various mounting options - local on flow meter, DIN rail, panel etc
  • Fully user programmable
  • Several output options eg. 4-20mA 0-5V etc