PEPPERL+FUCHS Voltage Repeater KFD2-VR4-Ex1.26

The PEPPERL+FUCHS KFD2-VR4-Ex1.26 is an isolated barrier designed for intrinsic safety applications. It facilitates the safe transmission of vibration sensor signals from hazardous areas to a control system in safe areas. This device provides either a voltage or current supply to vibration sensors such as those from Bently Nevada or other accelerometers.

Functionality and Output

Power Supply for Vibration Sensors: The device delivers a specific current or voltage depending on the type of sensor:
- For 2-wire sensors: It provides supply currents of 3.6 mA, 5.3 mA, or 8.9 mA.
- For 3-wire sensors: It supplies 18 V at 20 mA.

This ensures that both 2-wire and 3-wire vibration sensors receive the necessary power and signal transmission.

Technical Specifications

General Specifications

Signal Type: Analog input.
Safety Integrity Level (SIL): SIL 2, meeting functional safety standards.
Rated Voltage: 19 to 30 V DC.
Power Consumption: Max 1.6 W.
Power Dissipation: Max 1.2 W.

Input and Output

Input Connections:
- Common terminal (4) and individual terminals for signal and supply (terminals 1, 2, 3, 5, and 6).
- Input resistance: 10 kΩ (terminals 4, 6-/2-).
- Output current:
  - > 10 mA at -21 V or > 20 mA at -18 V (terminals 4 and 5).
  - 5.3 mA ±0.4 mA at -10 V (terminal 4 and 1).
  - 3.6 mA ±0.7 mA at -10 V, 20°C (terminal 4 and 3).
Transmission Range: -20 … 0 V.
Output Connections:
- Control side connections: Terminals 7- (signal negative), 8+ (signal positive).
- Output Resistance: 24 Ω typical, 27 Ω maximum.
- Load: Minimum 9 kΩ for 3-wire sensors, 2 kΩ for 2-wire sensors.

Transfer Characteristics

Cut-off Frequency:
- 10 kHz (-0.1 dB)
- 20 kHz (-1 dB)
DC Transfer Error: Less than 10 mV (with a 10 kΩ load).
AC Error: ±5 mV at 20°C (68°F) for alternating components (square or sine waves), within specified input ranges.
Temperature Influence: Less than 100 ppm of span per K.
Time Delay: 7.1 ±0.3 µs.

Ripple

200 kHz bandwidth: < 20 mVrms.
20 kHz bandwidth: < 3 mVrms.

Galvanic Isolation

Output/Power Supply Isolation: Functional insulation with a rated insulation voltage of 50 V AC.
Safe Galvanic Isolation: Voltage peak value of 375 V according to IEC 60079-11.

Certifications and Compliance

EU-type Examination Certificate: BAS 02 ATEX 7206.
Marking:
- Ex ia Ga IIC (gas)
- Ex ia Da IIIC (dust)
- Maximum Safe Voltage: 253 V.
IECEx Approval: IECEx BAS 05.0078, IECEx BAS 10.0085X.
EMC Compliance: EN 61326-1:2013, EN 61326-3-2:2018.
Environmental Compliance:
- EMC: NE 21:2017, EN IEC 61326-3-2:2018.
- Protection against electrical shock: UL 61010-1.
Degree of Protection: IP20, suitable for industrial locations.
Ambient Temperature: -20°C to 60°C (-4°F to 140°F).

Mechanical Specifications

Dimensions:
- Width: 20 mm (0.8 inches)
- Height: 119 mm (4.7 inches)
- Depth: 115 mm (4.5 inches)
Mass: Approximately 125 g.
Mounting: Can be mounted on a 35 mm DIN rail (EN 60715).

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