Universal frequency converter

Model : PR 3225
  • Conversion of frequency into standard Digital or Analog signals
  • Frequency input measurement range: 0.001Hz to 100kHz
  • Input sensors: NAMUR, NPN, PNP, Tacho, TTL & S0
  • Relay output functions: Setpoint, Window, Latch
  • DC Current and Voltage output
  • 5kVAC galvanic isolation
  • Fast response time < 30ms
  • Easily configurable via DIP-switch
  • Power supply: 16.8 VDC…31.2 VDC


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< 0.06% of span


PR Electronics


ATEX, Zone2, IECEx, Zone2, UKEX, Zone2, UL 61010


113x 6.1×115 mm


Digital to Analog Converter, Digital to Digital Converter, Frequency Converter

Input Type

Contact, NAMUR, NPN, PNP, Pulse, S0, Tacho, TTL

Isolation Voltage

2.5 kVAC

Number of Inputs


Number of Outputs


Output Type

DC Current, DC Voltage, Relay

Power Supply

20…30 VDC


4500 series devices, DIP switch, PR 4590

Temperature Coefficient

0.006% /°C

Other product features

Analog, Relay

Functional highlights

  • Measures frequencies up to 100 kHz.
  • Active current output.
  • Buffered voltage output 10 VDC.
  • 2-point process calibration.
  • User-programmable trigger levels -0.05…6.5 V and sensor supply 5…17 V.
  • NAMUR sensor error detection.
  • Output relay with windows, setpoint and latch functionality.
  • Simulation of process value during commissioning / maintenance.
  • Fast response time, with simultaneous sensor error detection (PATENTED).
  • All terminals are over-voltage protected, polarity protected and short-circuit protected.

Technical highlights

  • Accuracy < 0.06% / span.
  • Response time < 30 ms.
  • 2.5 kVAC, 3-port galvanic isolation.
  • Wide ambient temperature range -25…70°C.
  • NAMUR NE21, NE43.


  • Easy configuration via DIP switches.
  • Factory calibrated in all selectable measurement ranges.
  • Configuration, monitoring, and diagnostics using PR 4500 detachable communication interfaces via the PR 4590 ConfigMate.
  • All programming can be password protected.
  • Scrolling help text in 7 languages.


  • Units can be mounted side by side, horizontally and vertically, without air gap on a standard DIN rail, even at 70°C ambient temperature.
  • Units can be supplied separately or installed on PR 9400 power rail.
  • The narrow 6.1 mm housing allows up to 163 units per meter.
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