PR Electronics 5225A Programmable F/I-F/F Converter


  • Pulse conditioning
  • Frequency generator
  • Concurrent f/I and f/f function
  • Analog current and voltage output
  • PNP / NPN output, optional relays
  • Programmable by PC and Loop Link

PR Electronics 5225A Programmable F/I-F/F Converter is a versatile and highly configurable transmitter designed for frequency to current and voltage conversion, pulse division or multiplication, and frequency generation. It can be configured using a standard PC with the Loop Link communications unit or delivered fully configured, making it suitable for a variety of industrial applications.

Advanced Features

  • PC Configuration: Configurable with a standard PC and the Loop Link communications unit.
  • Fully Configured Delivery: Optionally delivered fully configured for immediate use.
  • Concurrent Functions: Enables concurrent f/I and f/f functions for a scaled digital output signal alongside the analog output.
  • Programmable Digital Outputs: Includes options for NPN, PNP, or relay outputs.
  • Frequency Generator: Can function as a time base or clock generator.
  • Polarity Reversal Protection: Provides input and supply polarity reversal protection.


  • Frequency to Current/Voltage Conversion (f/I): Converts frequency signals to current and voltage outputs.
  • Pulse Division/Multiplication (f/f): Used for pulse division or multiplication and as a buffer for collecting fast pulse trains.
  • Digital and Analog Outputs: Supports concurrent digital and analog outputs for comprehensive signal processing.
  • Frequency Generation: Functions as a frequency generator for time base or clock generation applications.

Technical Characteristics

  • Front LED Indicators: Four front LEDs indicating active inputs (not NPN), Dig.out.1 (NPN or relay 1) and Dig.out.2 (relay 2) outputs, and a NAMUR input error signal.
  • Configurable Analog Output: Analog current output configurable to any current within the 0…20 mA range.
  • Selectable Voltage Output Range: Voltage output range selectable between 0…10 VDC and 0…1 VDC using internal jumpers.
  • Wide Input Range:
    • Frequency: 0…20,000 Hz
    • Sensor Types: NAMUR, tacho, NPN, PNP, TTL, S0
  • Output Range:
    • Current and Voltage Output: 0…20 mA / 0…10 V
    • Relay Outputs: 0…20 Hz
    • NPN and PNP Output as f/f: 0…1000 Hz
    • NPN and PNP Output as Generator: 0…20,000 Hz

PR Electronics 5225A Programmable F/I-F/F Converter is an ideal solution for industries requiring precise frequency to current/voltage conversion, pulse processing, and reliable signal handling capabilities. Its versatile configuration options and advanced features make it suitable for a wide range of industrial applications.


Operating temperature -20°C to +60°C
Calibration temperature 20…28°C
Relative humidity < 95% RH (non-cond.)
Protection degree IP20
Dimensions (HxWxD) 109 x 23.5 x 130 mm
Weight approx. 190 g
DIN rail type DIN 46277
Wire size 1 x 2.5 mm2 stranded wire
Screw terminal torque 0.5 Nm
Supply voltage 19.2…28.8 VDC
Max. required power 3.5 W
Internal power dissipation 1.7 W
Isolation voltage
Warm-up time 30 s
Power-up delay 0…999 s
Programming Loop Link
Signal / noise ratio Min. 60 dB
Response time, analog < 60 ms + period
Response time, digital output < 50 ms + period
Response time, concurrent f/I and f/f < 80 ms + period
Signal dynamics, output 16 bit
Effect of supply voltage change < ±0.002% of span / %V
Auxiliary voltage: NAMUR supply 8.3 VDC ±0.5 VDC / 8 mA
S0 supply 17 VDC / 20 mA
NPN / PNP supply 17 VDC / 20 mA
Special supply (programmable) 5…17 VDC / 20 mA
Temperature coefficient < ±0.01% of span / °C
Linearity error < 0.1% of span
EMC immunity influence < ±0.5%
Common input specifications
Max. offset 90% of selected max. frequency
Measurement range 0…20 kHz
Min. measurement range 0.001 Hz
Low cut-off frequency 0.001 Hz
Max. frequency, with input filter ON 50 Hz
Min. period time with input filter ON 20 ms
Input types NAMUR acc. to DIN 19234 Tacho
S0 acc. to DIN 43864
Common output specifications
Updating time 40 ms for concurrent f/I and f/f 20 ms
Current output
Signal range 0…20 mA
Min. signal range 5 mA
Load (@ current output) ≤ 600 Ω
Load stability ≤ 0.01% of span / 100 Ω
Current limit < 23 mA
Voltage output
Signal range 0…10 VDC
Min. signal range 250 mV
Load (@ voltage output) ≥ 500 kΩ
Relay output
Max. switching frequency 20 Hz
Isolation, test / working 3.75 kVAC / 250 VAC
Max. voltage 250 VRMS
Max. current 2 AAC
Max. AC power 500 VA
Max. load at 24 VDC 1:00 AM
Other output types Active outputs (NPN / PNP) f/f converter output
Frequency generator
of span = of the presently selected range
EMC 2014/30/EU
LVD 2014/35/EU
EAC TR-CU 020/2011


PR Electronic 5225A Programmable F/I-F/F converter-DpstarGroup