Pepperl+Fuchs KFD2-PT2-Ex1-5 Potentiometer Converter (72023)
The Pepperl+Fuchs KFD2-PT2-Ex1-5 (Part Number: 72023) is a high-performance single channel isolated barrier for intrinsic safety applications. The instrument operates on the well-known K-System DIN rail platform and supplies a very stable source voltage to a potentiometer in an explosion-hazardous location (Zone 0/1/2) and transmits its wiper position to the safe control area with great accuracy.
It converts the field potentiometer resistance into a typical linear 4mA…20mA analogue current output and so is a key link between field devices and supervisory PLC/DCS systems. Designed for harsh conditions, the device has become an industry mainstay in industrial and maritime processing systems due to its high accuracy and functional safety compliance.
Technical Details
| Parameter | Specifications |
|---|---|
| Manufacturer | Pepperl+Fuchs |
| Model Number | KFD2-PT2-Ex1-5 |
| Material / Part Number (MPN) | 72023 |
| Signal Type | Analog Input |
| Supply Voltage Range | 20 to 35 V DC via Power Rail or Terminals 11+, 12- |
| Power Consumption | ≤ 1.3 W |
| Field-Side Potentiometer Input | 800 Ohm to 100 kOhm (Nominal) |
| Control-Side Output Signal | 4 mA to 20 mA (Current loop, max load ≤ 1 kOhm) |
| Transfer Accuracy | 0.05 % |
| Rise Time (10% to 90%) | ≤ 8 ms |
| Housing Dimensions | 20 x 107 x 115 mm (0.8 x 4.2 x 4.5 inches) |
| Weight / Protection Degree | Approx. 120g / IP20 |
Applications
- Maritime Vessel Controls: Valve position indicators, rudder angle feedback loops and tank level transmitter calibration lines.
- Oil & Gas Processing Plants: intrinsic safety isolation for hazardous zone position feedback, actuators and field mounted manual controls.
- Chemical Processing Plants: Hazardous area instrumentation that has to transmit dependable 4-20mA signals to safe-area control rooms.
- Machinery Automation: Precision displacement and position measuring setups with heavy-duty industrial potentiometers.
System Compatibility
- Fully compatible with standard 35mm DIN mounting rails according to EN 60715:2001.
- Native integration with Pepperl+Fuchs UPR-03 Power Rails and K-DUCT profile rail systems for simplified, screwless power distribution.
Part Number Cross-References
- Pepperl+Fuchs 072023 / 72023
- KFD2-PT2-Ex1 (Voltage variant counterpart: 0-10V output)
- KFD2-PT2-Ex1-6-Y112844
Engineer’s Insight:
When deploying the KFD2-PT2-Ex1-5 in maritime environments—such as engine room valve monitoring or hydraulic ram position sensing—field cable lengths can be massive. Voltage drops across these long cables create signal drifts that ruin sensor accuracy.
To mitigate this, always opt for the 5-wire installation layout rather than the standard 3-wire bridge whenever possible. The 5-wire mode utilizes terminals 2 and 5 as dedicated sense lines. This configuration automatically measures and compensates for dynamic variations in lead resistance up to 5% of your nominal potentiometer value, preserving your $0.05\%$ accuracy margin despite vessel vibration and thermal cycling.
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