This FBR74 isolated barrier is used for intrinsic safety applications.
The device supplies 2-wire and 3-wire SMART transmitters in a hazardous area, and can also be used with 2-wire smart current sources or universal temperature sensor input.
It transfers the analog input signal to the safe area as an isolated current value.
Digital signals may be superimposed on the input signal in the hazardous or safe area and are transferred bi-directionally.
If the HART communication resistance in the loop is too low, the internal resistance of 250 Ω between terminals 32 and 33 can be used.
Test sockets for the connection of HART communicators are integrated into the terminals of the device.

  • 1/2 channel isolator barrier
  • 24VDC supply (Terminal or Power Rail)
  • input 2-wire and 3-wire SMART transmitters and 2-wire SMART current sources
  • Output 0/4 mA ... 20 mA
  • Terminals with test points
  • Suitable for the SMART devices as ABB, E+H, EMERSON, FUJI, SMAR, VEGA, …


  • 1/2 channel isolator barrier
  • 24VDC supply (Terminal or Power Rail)
  • 2- or 3-wire source or sink current input
  • Universal temperature sensor input
  • Single or dual current output
  • Fully configurable via HART protocol
  • 4-way galvanic isolation implementation between supply/input/output#1/output#2
  • HART signal transfer to smart devices in hazardous area bi-directionally
  • Suitable for the following SMART devices: ABB, Endress+Hauser, Emerson, Fuji, Smar , VEGA, …
  • FBR74 is a Hart compatible Isolator Barrier which can supply a transmitter in hazardous area and transfer its output signal to safe area. According to variety in input signal types and driving up to two current output signals, this device can be used in any analog signal conversion applications.
  • FBR74 Is fully Hart compatible and Hart configurable. In case of smart device connected as input signal, device operates as Hart Bridge and operator can communicate with hazardous located smart device from hart communicator located in safe area. In case of universal temperature input type, device operates as smart transmitter and operator can configure it via Hart protocol.
  • FBR74 Provides excellent flexibility, low storage and installation costs. The high reliability ensures a safe system operation and low maintenance costs.
  • Input:
    2- or 3-wire smart device
    2-wire (0/4-20mA) current sink/source
    2-, 3-, or 4-wire Resistance (0 … 100KΩ)
    2-, 3- or 4-wire Resistance thermometer
    Voltage (-125 … 1150 mV)
    Thermocouples type B, C, E, J, K, L, N, R, S, T and U
  • Output:
    Single or dual 0/4-20mA current sink/source
  • Operating Temperature:
    -40°C to 85°C
  • Electrical isolation:
    Galvanic isolation between input, output(s) and power supply
  • Digital low drift processing of measurement values
  • Customer –specific linearization
    32 tie points
  • Continuous sensor self-monitoring
    Parameters saved permanently in EEPROM
    Monitoring of ADC and DAC parameters every 1 sec
    Wire break monitoring acc. With NAMUR NE 89
  • Dual Input functionality
    Absolute, differential, average values
SMART Safety Barrier FBR74 Series
SMART Safety Barrier FBR74 Series

SMART Isolator Barrier

FBR74 Series