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Carrier-Frequency Pulse Amplifiers (VTD 03)

with dual pickup, for pulse doubling and reverse-flow detection

The integral carrier-frequency pickups detect the r.p.m. of KEM flow meters. Each passing of a tooth will be detected contactless and produce a pulse at the output. Accordingly each pulse corresponds to a fixed volume and the frequency corresponds to the volume flow. The two output signals, phase-shifted by 90°, offer the possibility of a true forward / backward detection. Alternatively the VTD 03 can give out the double frequency and a direction signal as well.


Technical Data

  • Supply Voltage: UB: 5 up to 30 V DC, regulated
  • Quiescent Current: IR < 2 mA
  • Frequence Range: 0.5 up to 5,000 Hz depending on flow meter
  • Ambient Temperature: -40 °C up to +60 °C [-40 °F up to +140°F], depending on version
  • Medium Temperature: -40 °C up to +80 °C [-40 °F up to +176 °F]
  • Phase Shift: 90 °
  • Output Signal: Push-Pull or Open Collector (on request)
  • Connector: M12, 5-pin, A-coded or M16 (option)
  • Ex Protection:
    • ATEX: II 2G Ex ia IIC T4 Gb
    • IECEx: Ex ia IIC T4 Gb
    • cCSAus:
      • Class I, Div. 1, Groups A, B, C, D ; T4
      • Ex ia IIC T4 Ga
      • Class I, Zone 0 AEx ia IIC T4 Ga


Evaluation Electronics