Universal frequency converter




  • Input: NAMUR, NPN, PNP, Tacho, TTL, S0 & switches
  • Output: Universal mA / V or relay
  • 2.5 KVAC isolation
  • DIP-switch or display programmable
  • Power supply 16.8 VDC…31.2 VDC
Zone2 Ex Iec Iecex Zone2 UL List CCC 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 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.

Data sheet & Manuals

Data sheet


Manuals in Russian

Approvals & Certificates

ATEX certificate

IECEx certificate

UKEX certificate

UL certificate

CCC certificate

Supplementary documentation

EU Declaration of Conformity

UKCA Declaration of Conformity

EMC data

PR default configurations

Safety note

Safety note

Environmental Conditions

Operating temperature -25°C to +70°C
Storage temperature -40°C to +85°C
Calibration temperature 20...28°C
Relative humidity < 95% RH (non-cond.)
Protection degree IP20
Installation in Pollution degree 2 & meas. / overvoltage cat. II

Mechanical specifications

Dimensions (HxWxD) 113 x 6.1 x 115 mm
Weight approx. 70 g
DIN rail type DIN EN 60715/35 mm
Wire size 0.13...2.5 mm2 / AWG 26...12 stranded wire
Screw terminal torque 0.5 Nm

Common specifications


Supply voltage 16.8...31.2 VDC
Fuse 400 mA SB / 250 VAC
Max. required power ≤ 1.2 W
Max. power dissipation 0.65 W

Isolation voltage

Isolation voltage, test / working 2.5 kVAC / 300 VAC (reinforced)

Response time

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

Auxiliary supplies

Sensor supply limitation 23 mA, 5…17 V
Signal dynamics, output 18 bit
Long term stability, current, 1yr / 5yr @ 25°C ≤ 0.058% / ≤ 0.101%
Long term stability, voltage, 1yr / 5yr @ 25°C ≤ 0.032% / ≤ 0.058%
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

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
NAMUR, trig-level LOW / HIGH ≤ 1.2 / ≥ 2.1 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, active 0...23 mA
Programmable signal ranges 0 / 4...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

Voltage output

Signal range ≤ 11.5 VDC
Programmable signal ranges 0...1; 0…5; 0...10; 0.2...1; 2…10 VDC
Load (@ voltage output) ≥ 10 kΩ
Response time, programmable 0.0...60.0 s

Relay output

Relay functions Setpoint, Window and Latch
Hysteresis 0...100%
ON and OFF delay 0...3600 s
Power On delay 0...9999 s
Sensor error reaction Break / Make / Hold
Max. voltage 250 VAC / 200 VDC
Max. current 2 A
Max. AC power 500 VA
Max. DC current, resistive load ≤ 30 VDC 2 ADC
Max. DC current, resistive load > 30 VDC See manual for details

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
ATEX 2014/34/EU & UK SI 2016/1107


IECEx KEM 10.0068X
c UL us, UL 61010-1 E314307
CCC 2020322310003554


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Dedicated Presale / Aftersales
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Product reliability

Product reliability
Although we’d always like to be top of mind, we recognize our job is mainly to provide peace of mind. Install & Forget® is our way of saying that once installed, our devices will continue to perform even in the toughest environments. And we are not afraid to back that statement up with commitments.


Product deployment

Product deployment
Our devices are intuitive and simple to configure. Once installed they visualize rich diagnostics data, allowing the operator to plan preventative maintenance, maximizing process up-time.



Smart products

Smart products
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