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Passive Isolator DH 1000

Separation of 0(4) to 20 mA Standard Signals

The loop-powered isolator DH 1000 provides galvanic separation for 0(4) to 20mA standard signals, while transferring the measurement signal to the output with a high degree of accuracy.

  • Galvanic isolation across input and output
    Protection against erroneous measurements due to parasitic voltages or ground loops
  • No power supply required
    Saving costs since wiring is reduced and line influences are omitted
  • Extremely compact design, 1- and 2-channel versions
    Only 6.3 mm DIN-rail per channel
  • High accuracy
    No falsification of measured signal
  • Protective Separation
    Protects service personnel and downstream devices against impermissibly high voltage
  • Maximum reliability
    No maintenance costs
  • 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)

In this way, the unit avoids interference voltage carry-over, effectively suppressing interference. The very low drop voltage of 2.0 V, a high level of accuracy and a compact design all work together to make the DH 1000 the first choice in system design.

The slim housing with 12.5 mm width for one or two channels saves space in your switch cabinet and facilitates by the practical plug-in screw terminal blocks the assembly. The DH 1022 requires only 6.3 mm DIN-rail space per channel.

Intelligent design and their consequential avoidance of highly integrated components result in extremely long service lives and reliability without any falsification of the measurement signal.

To protect both maintenance personnel as well as downstream equipment against impermissibly high voltages, the DH 102X offers Protective Separation with a test voltage of 4 kV AC. The DH 1000 requires no additional power supply since the auxiliary power is obtained from the input signal without distorting it. This not only saves costs during installation, but also increases reliability.

Product line

Product line DH 1000
Devices Order No.
Loop-Powered Isolator, 1-channel DH 1011 AG
Loop-Powered Isolator, 2-channel DH 1012 AG
Loop-Powered Isolator, 1-channel
     Protective Separation, test voltage 4 kV~
DH 1021 AG
Loop-Powered Isolator, 2-channel
     Protective Separation, test voltage 4 kV~
DH 1022 AG

Technical Data


Input signal 0(4) to 20 mA
Start-up current < 20 µA
Voltage drop < 2.0 V
Overload 100 mA, 30 V


Output signal 0(4) to 20 mA
Cut-off frequency -3 dB 100 Hz at 500 Ohm load
Response time T99 5 ms at 500 Ohm load
Residual ripple < 10 mVrms

General Data

Transmission error < 0.1 % full scale
Load error < 0,03 % of measured value / 100 Ohm load
Temperature coefficient 1) < 15 ppm/K of measured value / 100 Ohm load
Test voltage 4 kV, 50 Hz , 1 min. all circuits against one another
   Working voltage 2)
   (Basic Insulation)
Up to 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 between
all circuits.
Ambient temperature Operation
Transport and storage
–20 °C to +70 °C  (-4 to +158 °F)
–35 °C to +85 °C  (-31 to +185 °F)
EMC 3) EN 61326-1
Construction 12.5 mm (0.49") housing, protection class: IP 20
mounting on 35 mm DIN rail acc. to EN 60715
Weight Approx. 100 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

  • Channel 1
  • 1 + Input
  • 2 − Input
  • 5 + Output
  • 6 − Output
  • Channel 2
  • 3 + Input
  • 4 − Input
  • 7 + Output
  • 8 − Output

Pluggable screw clamp terminals
Metal lock for fasting on 35 mm DIN rail
Wire cross-section max. 2.5 mm², Multi-wire connection max. 1 mm² (two wires with same cross-section)

Subject to change!

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