Frequently asked questions

What is live-zero?

Live-zero raises the identification rate of a plant's failures and hence increases operating reliability. Here the measuring value zero is not transmitted as a standard signal of the variable zero; instead it obtains an offset. For current loops this offset is fixed at 4 mA.
If there is line breakage or the transmitter fails, the result is a signal at 0 mA, but because measuring starts at 4 mA, the failure or line breakage can be detected unmistakably.

Customary live-zero standard signals are:

  • 4 - 20 mA
  • 2 - 10 mA
  • 2 - 10 V
  • 1 - 5 V

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