HarvyLRBattery-free LoRaWAN current sensor
HarvyLR is a LoRaWAN sensor for aquisiton of DC and AC currents. Unlike common LoRaWAN sensors, it does not require any battery or external power supply.
compact, self-powered, maintenance-free
Once installed, it runs self-sufficient and maintenance-free: the IoT sensor draws the energy it needs for operation from its environment. The principle behind it: Energy Harvesting.
The sensor can digitize both common analogue signals of 4–20 mA and alternating currents of up to 25 or 250 mA. A typical application is the aquisiton of RMS currents at electrical main or sub-distributions or directly at the plant. For this purpose, it is simply with a suitable deZem clamp-on current transformers combined.
An intelligent event filter is integrated into the current sensor, which, for example, maps the inrush currents of systems to the second. Alternatively, measured values can also be read out in a fixed time grid - even synchronously for measuring points distributed anywhere in the world.
Use case and measurement setup
Example of application
- Wireless reading of widely distributed deZem current transformers and inaccessible sensors of various types, such as in factory halls, building complexes or outdoor areas
- Readout of sensors with mA output that are powered by movement from wind, water or light, e.g. illuminance via PV cells, anemometers with current output, flow sensors with direct current output
- Connecting ultrasonic flow sensors (4–20mA output), which are often installed in locations without good data connectivity
Simple measurement setup
- e.g. connect a 4-20 mA analogue signal or deZem clamp-on current transformer via plug-in contact with suitable HarvyLR
- HarvyLR sends encrypted measured values to LoRaWAN gateway
- LoRaWAN gateway sends measured values via LTE router or existing network connection to an IoT platform, e.g. the secure deZem IoT platform
All functions at a glance
- For any DC current signal up to 36 or 360 mA respectively or AC current signal up to 25 mA or 250 mA
- Self-powered and maintenance-free (battery-free!); input current of 0.125 mA is sufficient for stable operation (with HarvyLR-36)
- AC and DC signals can even be combined if, for example, a fixed supply is required
- Excellent data transmission over several kilometers and through thick house walls
- With intelligent event filter, which enables measurement series (inrush currents, etc.) accurate to the second, at a fixed maximum rate
- Compact design
- Simple installation; no cable pulling
- Configuration and updates via Bluetooth
- Applicable with the deZem IoT platform and any other platform (JavaScript decoder freely available, e.g. for the TTN)
The sensor is available in two versions:
HarvyLR-36
ffor DC currents up to 36 mA (typically 4-20 mA DC) and AC currents up to 25 mA (effective value AC)
HarvyLR-360
for DC currents up to 360 mA (typically 4-20 mA DC) and AC currents up to 250 mA (effective value AC)
HarvyLR Video
References
Our customers are excited
Bayer AGWe especially appreciate how easy, quick, and straightforward it is to set up the metering points.
At Bayer’s Berlin site, we have been using LoRaWAN technology with deZem’s Harvys for energy management at selected locations since 2023. Our current applications include electricity measurement, such as temporary machine performance monitoring for energy usage and demand forecasting, identifying potential savings like reducing standby consumption, and detecting peak usage. We particularly appreciate the simple, fast, and straightforward setup of metering points in areas with good LoRaWAN gateway coverage. We are eagerly anticipating the commercial release of the Harvy2, which promises even easier setup of metering points and smarter applications.
Interested in LoRaWAN?
LoRaWAN (Long Range Wide Area Network) is ideal for the wireless data transmission about long distances up to several kilometres away. The signals even penetrate thick walls and transmit from deep shafts. LoRaWAN sensors require little or no battery. This innovative wireless technology is used, for example, in Smart City projects, networking of factory premises or the monitoring of wells and shafts. deZem offers a range of innovative LoRaWAN solutions that can be seamlessly integrated into the overall system.
