PR 4225 Universal f/l-f/f Converter

The PR 4225 Universal f/I-f/f Converter is a versatile industrial signal conditioning device for converting a wide range of sensor and frequency inputs into precise analog, frequency or relay outputs. The 4225 frequency converter, from PR electronics, is ideal for advanced automation, process control, and monitoring systems. Built to handle signals from NAMUR, NPN, PNP, TTL, S0, tacho, and switch sources, the PR 4225 measures frequencies up to 100 kHz and delivers configurable bipolar or unipolar current (±23 mA / 0-23 mA) and buffered voltage (±10 VDC) outputs.

• 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 feature protection from over-voltage (24 VDC), polarity, and short-circuit.
• The PR 4225 Universal f/I-f/f Converter provides the necessary failure data (SFF and PFDAVG) for SIL 2 applications as per IEC 61508 / IEC 61511.
• Failure rates for the PR 4225 frequency converter correspond to Performance Level "d" according to ISO-13849.

PR 4225 Universal f/l-f/f Converter from PR electronics

Featuring programmable trigger levels and linearization functions (linear or square root), the PR 4225 Universal f/I-f/f Converter supports two-point calibration and advanced sensor error detection, thus making it ideal for process interfacing, motion measurement, and frequency-to-signal applications. Its universal power supply (21.6-253 VAC / 19.2-300 VDC) and robust 3-port galvanic isolation (2.3 kVAC) ensure reliable performance in industrial environments, while compliance with NAMUR NE21/NE43 and support for SIL 2/PL "d" safety levels enhance system integrity.

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

Easy Mounting, Installation, and Programming

Configuration, diagnostics, and remote monitoring are easily managed via the detachable PR 4500 communication interface, which also enables Modbus and Bluetooth connectivity using the PR Process Supervisor (PPS) app. With fast response time (< 30 ms), over-voltage and short-circuit protection on all terminals, the PR 4225 Universal f/I-f/f Converter delivers precision, flexibility, and industrial-grade reliability for complex signal conversion needs.

• 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 mount side by side, horizontally, and vertically, without air gap on a standard DIN rail – even at 140˚F (60˚C) ambient temperature.