Description
Technical Specifications
- Product Model: P+F KFD2-VR4-Ex1.26
- Brand: Pepperl+Fuchs
- Warranty: One Year
- Input Voltage: 19–30 VDC (24 VDC nominal via Power Rail or terminals)
- Operating Temperature: -20°C to +60°C
- Storage Temperature: -40°C to +70°C
- Response Time: Approx. 7.1 μs signal delay
- Protection Class: IP20
- Accuracy Class: DC transmission error <10 mV (typical)
- Output Frequency: Analog signal bandwidth up to approx. 10–20 kHz
- Rated Current Range: Sensor supply 3.6 mA / 5.3 mA / 8.9 mA (2-wire) or 18 V at 20 mA (3-wire)
- Communication Interface: Analog signal interface through screw terminals
- Supported Protocols: Analog signal transmission for vibration monitoring systems
- Overload Capacity: Intrinsic safety protection with galvanic isolation up to 375 V peak
- Transmission Range: −20 V to 0 V analog signal
- Dimensions: Approx. 20 mm × 119 mm × 115 mm
- Mounting Type: DIN-rail mounting (EN 60715)
Product Overview
The P+F KFD2-VR4-Ex1.26 is an intrinsically safe voltage repeater and isolated barrier designed to interface vibration sensors installed in hazardous areas with monitoring systems located in safe zones. Manufactured by Pepperl+Fuchs, this module ensures safe and reliable signal transmission between field instruments and control systems in environments where explosive gases or dust may be present.
In industrial facilities such as refineries, chemical plants, or offshore platforms, vibration monitoring sensors are often installed on critical rotating equipment located in hazardous areas. Direct electrical connections between these sensors and control systems could create ignition risks. This module solves that problem by providing galvanic isolation and intrinsic safety protection, allowing measurement signals to be transmitted safely across hazardous-area boundaries.
The module also supplies power to vibration sensors such as accelerometers while simultaneously transferring the analog voltage signal to the safe-area monitoring system. Its compact DIN-rail design and Power Rail compatibility allow easy integration into process automation cabinets and machinery protection systems. Pepperl+Fuchs intrinsic safety barriers like this unit are widely used in vibration monitoring solutions for turbines, compressors, and pumps.
Key Functions
Intrinsic Safety Signal Isolation
The module acts as an isolated barrier between hazardous and safe areas. It ensures that electrical energy entering the hazardous zone remains within safe limits, preventing ignition risks while still allowing measurement signals to pass to control systems.
Vibration Sensor Signal Transmission
Designed specifically for vibration monitoring systems, the module transfers analog voltage signals from accelerometers or velocity sensors. The signal range of −20 V to 0 V ensures accurate transmission of vibration measurement data.
Integrated Field Sensor Power Supply
The device can supply power to connected sensors. Depending on wiring configuration, it can provide several current levels for two-wire sensors or up to 18 V at 20 mA for three-wire sensors, supporting common industrial vibration probes.
High-Integrity Functional Safety
With certification up to SIL 2 according to IEC/EN 61508, the module supports safety-critical industrial applications where reliable signal transmission is required for equipment protection and process safety.
Compact DIN-Rail Integration
The narrow housing allows installation on standard DIN rails within control cabinets. Power Rail connectivity also simplifies wiring when multiple signal isolators are installed in the same automation panel.
Application Scenarios
Turbine and Compressor Vibration Monitoring
Power plants and petrochemical facilities install vibration sensors on turbines and compressors. The module safely transfers these vibration signals from hazardous zones to monitoring systems used for machinery protection.
Oil and Gas Processing Plants
In refineries and offshore platforms, equipment located in explosive atmospheres requires intrinsically safe signal interfaces. The module provides a reliable connection between field instrumentation and plant control systems.
Machinery Protection Systems
Industrial vibration monitoring platforms—such as those used for rotating equipment diagnostics—rely on isolated barriers to connect sensors in hazardous environments without compromising system safety.
Chemical and Petrochemical Production
In chemical plants, process pumps and agitators often operate in explosive atmospheres. The module ensures safe communication between vibration sensors installed on these machines and the central monitoring system.
