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Technical Information

Self-powered LoRaWAN IoT sensor with four inputs for versatile monitoring in electrical supply networks

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Application​

The Harvy2 LoRaWAN sensor features:

  • convenient metering of three-phase RMS currents from: electrical mains, sub-distribution boards, and/or directly from the machines
  • four inputs for deZem current transformers and other sensor options (see page 2)
  • convenient plug-in system
  • when using the deZem voltage transformer on, at least, one Harvy2 input, it also ascertains the following parameters for each phase of the three- phase current:
    • active power
    • power factor
    • reactive power
    • apparent power
    • mains voltage
    • mains frequency
  • simple metering of up to four galvanically isolated 4-20 mA analogue signals from any source, if required widely distributed in factory halls, building complexes or outdoor areas*

Unlike conventional IoT sensors, Harvy2 does not require a battery or external power supply. This highly innovative elec- tronic feeds the sensor from the metering signal without falsifying it metrologically.

Advantages​

Energy monitoring easier than ever:

  • compatible with deZem current transformers up to 500 A (larger currents upon request)
  • four independent inputs for clamp-on current transformers and (upon request) many other signals
  • very easy set-up; wireless installation; convenient magnetic fixture for metal surfaces
  • no external power supply or battery required (energy harvesting)
  • compatible with the deZem IoT platform and any other platforms
  • intelligent event filter integrated - for metering series (inrush currents, etc.) accurate to the second at a defined maximum rate*
  • metering intervals, data rates, event filter criteria*, conversion factors, etc. configurable via USB-C
  • data visualisation via USB-C
  • firmware updates via USB-C
  • compact design
  • maintenance-free

Would you like to measure the total current of several supply lines?​

The currents, active loads, and active energies* of the first three Harvy2 inputs are recorded and will be presented as a combined sum.

Selecting the suitable clamp-on current transformer​

Selecting the suitable clamp-on current transformer depends mainly on the diameter of the supply wire to be measured (including insulation). The best measuring accuracy of the Harvy2 is achieved when the measuring range is well utilised.

Please note that the Harvy2 requires a minimum primary current via one of the four inputs according to the following table in order to send data regularly, if no voltage transformer or USB-C connection is attached. With larger primary currents, more data will be acquired and sent; in particular, relevant events in the course of measured values will then also be detected and transmitted immediately.*

deZem current transformers

Questions?​

If you have any questions, please contact us.

phone: +49 30 / 3180 0730

e-mail: harvy-support@dezem.de

We will be happy to assist.