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Passive Transmitter Repeater DC 58

Powering and Isolation of 2-wire transmitters

The Passive Transmitter Repeater DC 58 is used for powering of 2-wire transmitters and isolation of 4 to 20 mA standard signals.

  • Cost optimized design
    Economical separation for standard applications
  • Only 60 mm installation depth, 11.2 mm wide
    Can be installed in economical standard terminal boxes
  • Galvanic isolation across input and output
    Protection against erroneous measurements due to parasitic voltages or ground loops
  • Protective Separation acc. to EN 61140
    Protects service personnel and downstream devices against impermissibly high voltage
  • No power supply required
    Saving costs since wiring is reduced and line influences are omitted
  • 5 Years Warranty
    Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)

The 24 V power from the control system is transferred to the 2-wire transmitter with low voltage drop. The transmitter loop current is available galvanic isolated on output of the DC58. Additionally the measuring input accepts active 4 to 20 mA signals from 4-wire transmitters.

For communication with HART-Transmitters the internal 250 Ohm resistor on terminal 4 can be used. The slim housing with 11.2 mm wide saves significant space on the DIN-rail. To protect both maintenance personnel as well as downstream equipment against impermissibly high voltages, the DC 58 offers Protective Separation in according to EN 61140.

The DC 58 requires no additional power supply since the auxiliary power is obtained from the current loop without distorting it. This not only saves costs during installation, but also increases reliability.

Product line

Product line DC 58
Devices Order No.
Transmitter Repeater DC 58 P

Technical Data


Input signal 4 to 20 mA
Operating current range 2 to 23 mA
Transmitter Repeater operating  
Transmitter voltage drop Approx. 4.7 V
(Approx. 9.7 V with HART resistor, terminal 4)
Short circuit current < 35 mA
Isolator operating  
Input resistor 50 Ohm
Max. Input current ≤ 50 mA


Output signal 4 to 20 mA
Supply voltage 15 to 30 V DC
Residual ripple < 10 mVrms

General Data

Transmission error < 0.1 % full scale
Load error < 0.01 % FS / V   (deviation from 24 VDC)
Temperature coefficient 1) < 0.01 % / K
Cut-off frequency -3 dB 500 Hz
Response time T99 2 ms
Test voltage 3 kV AC, 50 Hz, 1 min. input against output
Working voltage 2)
(Basic Insulation)
600 V AC/DC for overvoltage category II and pollution
degree 2 acc. to EN 61010–1
Protection against electrical shock 2) Protective separation according to EN 61140 by reinforced
insulation in accordance with EN 61010–1 up to 300 V AC/DC
for overvoltage category II and pollution degree 2.
Ambient temperature Operation
Transport and storage
–20 °C to +60 °C   (–4 °F to +140 °F)
–35 °C to +85 °C   (–31 °F to +185 °F)
EMC 3) EN 61326 -1
Construction 11.2 mm (0.44") housing, protection classt: IP 20
mounting on 35 mm DIN rail acc. to EN 60715
Connections Wire cross-section max. 2.5 mm²
Weight Approx. 50 g
  1. Average TC related to full scale value in specified operating temperature range, reference temperature 23 °C
  2. For applications with high working voltages, ensure there is sufficient spacing or isolation from neighboring devices and protection against electric shocks.
  3. Minor deviations possible during interference

Block diagram


Terminal assignments

  • 1 + Input current
  • 2 − Transmitter
  • 3 + Transmitter / Input current
  • 4 − HART transmitter (250 Ohm)
  • 5 + Output loop
  • 6 − Output loop

Subject to change!

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Product request

Please add 4 and 8.