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What is 4-port isolation?

The standard signal splitter splits the input signal and makes it available at 2 outputs. Hence the splitter consists of 4 mutually potentially-isolated units, an input area, two output areas and the area for the supply of auxiliary energy to the device.

4-port isolation separates these circuits galvanically from one another, thus providing reliable protection from erroneous measurements owing to earth problems and parasitic voltages.

Do I have to readjust it after range switching?

No, the DRAGO Automation standard signal splitters can be switched in a calibrated state. All valid range combinations have already been compensated at the factory within the specified error margins.

Reuse of the measuring signal

You use the standard signal splitter to split the standard signal into 2 signals. This enables you to direct the measuring signal to different downstream devices without any retroactive effects and without mutual interference.


  • A measuring transducer delivers the 4 - 20 mA input current
  • Output I is configured for 4 - 20 mA and transmits the measured value to the process control
  • Output II is configured for 0 - 20 mA and controls a regulator

Additional measuring option for process signals

The standard signal splitters from the High Functionality series can be configured as current or voltage outputs on the output side. This makes it possible to create a shunt for measuring the process variable in a 4 - 20 mA current loop using a 0 - 10 V scale. Without breaking the current loop, at output II you can observe the current measured value using a voltage indicator, a chart recorder or a DVM.

Do you have further questions?

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