Universal f/I-f/f converter




  • Front programmable
  • Input: NAMUR, NPN, PNP, Tacho, TTL , S0 & switches
  • Output: Programmable bipolar mA / V, frequency or relay
  • Universal power supply 21.6...253 VAC / 19.2...300 VDC
UL List Exida Hw UKCA CE Pr Rohs Guarantee
  1. Overview + -

  2. Technical details + -

  3. Accessories + -

  4. Order and delivery + -

  5. Why choose PR + -

Functional highlights

  • Measures frequencies up to 100 kHz.
  • Active and passive current output ±23 mA / 0...23 mA.
  • Buffered voltage output ±10 VDC.
  • Linearization: Linear or square root function.
  • 2-point process calibration.
  • Programmable trigger levels -0.05…6.5 V.
  • Programmable sensor supply 5…17 V.
  • NAMUR sensor error detection.
  • Advanced configurable input limits for increased safety.
  • Digital output: NPN & PNP; 0...100 kHz with programmable logic level 5…24 V.
  • Output relay with windows, setpoint and latch functionality.
  • Simulation of process value during commissioning and maintenance.
  • All terminals are over-voltage protected (24 VDC), polarity protected and short-circuit protected.
  • Suitable for application in SIL 2 installations and for use in systems up to Performance Level “d” according to ISO-13849.

Technical highlights

  • Accuracy < 0.06% / span.
  • Temperature coefficient 0.006% / °C.
  • Response time < 30 ms.
  • 2.3 kVAC, 3-port galvanic isolation.
  • NAMUR NE21 and NE43.


  • Configuration, monitoring and diagnostics using the PR 4500 detachable communication interfaces. Product-specific functionality includes communication via Modbus and Bluetooth using our PR Process Supervisor (PPS) application, available for iOS and Android.
  • 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 60°C ambient temperature.

Data sheet & Manuals

Data sheet


Manuals in Russian

Supplementary documentation

EU Declaration of Conformity

UKCA Declaration of Conformity

Modbus configuration manual

FMEDA report

EMC data

ISO 13849 declaration

PR default configurations

Safety note

Safety note

Approvals & Certificates

UL certificate

Environmental Conditions

Operating temperature -20°C to +60°C
Storage temperature -20°C to +85°C
Calibration temperature 20...28°C
Relative humidity < 95% RH (non-cond.)
Protection degree IP20

Mechanical specifications

Dimensions (HxWxD) 109 x 23.5 x 104 mm
Dimensions (HxWxD) w/ PR 4500 109 x 23.5 x 131 mm
Weight approx. 160 / 165 / 150 g (A / B / C)
DIN rail type DIN EN 60715/35 mm
Wire size 0.13...2.08 mm2 AWG 26...14 stranded wire
Screw terminal torque 0.5 Nm
Vibration IEC 60068-2-6
2...13.2 Hz ±1 mm
13.2...100 Hz ±0.7 g

Common specifications


Supply voltage, universal 21.6...253 VAC, 50...60 Hz or 19.2...300 VDC
Fuse 400 mA SB / 250 VAC
Max. required power ≤ 2.5 W
Max. power dissipation ≤ 2.0 W

Isolation voltage

Test voltage 2.3 kVAC
Input to any (working) 250 VAC (reinforced)
Relay to relay (working) < 115 VAC (reinforced)
Relay to analog (working) > 115 VAC (basic)
NPN to analog (working) Isolated > 50 VDC
Push-Pull / PNP to analog (working) Shared ground with analog output

Response time

Response time (0...90%, 100...10%) ≤ 30 ms

Auxiliary supplies

Sensor supply limitation (terminal 44) 20 mA, 5…17 V
Programming PR 4500 communication interfaces
Signal dynamics, output 18 bit
Signal / noise ratio > 60 dB
Accuracy See manual for details
EMC immunity influence < ±0.5% of span
Extended EMC immunity: NAMUR NE21, A criterion, burst < ±1% of span

Input specifications

Frequency input

Frequency range 0.001 Hz to 100 kHz
Time range, time function 10 μs to 999.9 s
Max. frequency / min. pulse width, with input filter ON 75 Hz / 8 ms

Sensor specifications

NAMUR, trig-level LOW / HIGH ≤ 1.2 / ≥ 2.1 mA
Tacho, trig-level LOW / HIGH ≤ -50 mV / ≥ +50 mV
NPN / PNP, trig-level LOW / HIGH ≤ 4.0 V / ≥ 7.0 V
TTL, trig-level LOW / HIGH ≤ 0.8 V / ≥ 2.0 V
S0, trig-level LOW / HIGH ≤ 2.2 mA / ≥ 9.0 mA

Special voltage / current input

User-programmable trig-levels -0.05...6.50 V 0.0...10.0 mA

Output specifications

Current output

Signal range -23...+23 mA (bipolar) 0...23 mA (unipolar)
Programmable standard ranges 0...20, 4...20, S4-20, ±10 mA, ±20 mA
Load (@ current output) ≤ 600 Ω
Load stability ≤ 0.001% of span / 100 Ω
Response time, programmable 0.0...60.0 s
Sensor error indication 0 / 3.5 / 23 mA / none
Current limit ≤ 28 mA

Buffered voltage output

Signal range ± 11.5 V
Programmable standard ranges 0…5, 1…5, 0...10, 2…10, ± 5, ± 10 VDC
Load, min. > 2 kΩ
Response time, programmable 0.0...60.0 s

Relay output

Relay functions Setpoint, Window, Sensor error, Latch, Power and Off
Hysteresis 0...100%
ON and OFF delay 0...3600 s
Sensor error reaction Break / Make / Hold
Max. voltage 250 VAC / VDC
Max. current 2 A
Max. AC power 500 VA

Frequency output

Frequency range 0.001 Hz...100 kHz
Prog. pulse time (f ≤ 500 Hz) 1…1000 ms
Pulse time > 500 Hz Fixed 50%

NPN / PNP / Push-Pull output

Isink max. 130 mA
Voltage drop 130 mA < 1.5 VDC
Ext. voltage (terminal 24) max. 30 VDC
*Isource max. 30 mA
Vout 24 VDC ± 10%
Voltage 5…24 VDC

Observed authority requirements

EMC 2014/30/EU & UK SI 2016/1091
LVD 2014/35/EU & UK SI 2016/1101
RoHS 2011/65/EU & UK SI 2012/3032


c UL us, UL 508 E248256
SIL Hardware assessed for use in SIL applications


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