Safety barrier for digital outputs B-DO

 B-DO Digital output dividers must create a safety barrier between intrinsically safe circuits (devices located in potentially explosive zones or atmospheres) and other circuits that are located outside of potentially explosive zones. With its use, conventional devices designed to process output digital (such as pulse, binary or digital coding) signals can be easily connected to intrinsically safe correctors and recorders.

The B-DO (B-DO/A) digital output splitter is supplied with 12 V DC.

Digital output Separator is placed in a plastic box and is designed for installation into racks on DIN 35 mm rail.

Safety barrier for digital outputs

The device allows to isolate up to four digital signals from the corrector to intrinsically safe terminals DI1 to DI4. Signals go through the safety barrier and are connected to the output terminals DO1 to DO4 (input DI1 → output DO1, input DI2 → output DO2, etc.). In addition to the signal terminals DI1 to DI4, the "Digital inputs" terminal block also includes the U+ and GND terminals on which the internal intrinsically safe source voltage is applied. This intrinsically safe voltage is required to supply the digital output circuits in the corrector/recorder, which are galvanically isolated from the other corrector circuits. Electrical parameters of the signals are not changed after passing through the separator.

Basic features

  • The separator for up to 4 digital outputs for correctors ELCOR, ELCORplus, ELCORplus indexer, DATCOM and DATCOMplus data loggers
  • Type of output - open collector
  • Mounting on 35 mm DIN rail
  • The supply voltage is 12V
  • Operating temperature is -40 to +70°C

Available variants

  • B-DO - The basic design of the separator is designed for systems whose power is derived from the mains voltage (Um = 250V). The B-DO can be powered eg. from a non-backup power supply or from a battery-backup power supply, a rechargeable mains charger, etc.
    The basic design of the B-DO has galvanic isolation between the input and intrinsically safe output circuit.
  • B-DO/A - The B-DO / A design has a reduced self-consumption compared to the basic design. Its use is suitable for systems powered only by a battery, which can be recharged via solar panels (Um = 60 V).
    This power supply design has no galvanic isolation between the input and intrinsically safe output circuit (the negative input and output terminals are interconnected).


The device is designed and approved as a follow-up device. This means that only approved intrinsically safe devices complying with the intrinsically safe parameters specified in the EC-Type Examination Certificate may be connected to the intrinsically safe terminals of the instrument. The next connected equipment must be located outside the explosive zone operation.

Manual for accessories for ELCOR and ELCORplus in PDF


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