Self-generating wireless temperature sensors for incoming panels

Product Development Background

1.Current Status
  • Overheating is the most common cause of failure in incoming panels and bus ducts.
  • To diagnose internal conditions, the conventional temperature monitoring process involves:
    measuring the temperature using a temperature sensor → transmitting the signal through an optical or coaxial cable → displaying the temperature on a digital indicator on the front of the instrument panel
2. Drawbacks
  • It takes a long time to wire the signal line, reducing productivity; in the event of a system failure, the entire signal line must be replaced.
  • Separate power sources (batteries, DC 5V, etc.) are necessary for the operation of individual temperature sensors and transmission modules.

  • Batteries need to be replaced every 1.5 years; battery replacements cannot be performed when the lines are live due to safety concerns.
    When using DC 5V power, each transmitter requires an independent power source; the long amount of time required for wiring reduces production efficiency.


  • Energy Harvesting : Use of a magnetic induction coil to collect stray magnetic fields around the bus bar to generate AC voltage
  • A/D Power Conversion : Conversion of AC voltage into DC voltage to supply operating power to the bus bar temperature sensor and wireless transmission module
  • Wireless Temperature Transmitting/Receiving : Transmits bus bar temperature from each measuring sensor; displays the temperature on the digital temperature indicator, and saves and records the temperature


Self-sufficient Power supply
Inductive energy harvesting from magnetic stray fields (AC)
Start current
W50 × D70 × L43
W45 × D50 × L28
Plastic, non-conductive, flammability
High elastic clamp for busbar 6mm ~ 12mm thickness
Available busbar width
50mm ~ 150mm
Temperature probes
1 x Backside of housing with contact to bus bar
1 x ambient temperature
1 x PCB temperature

2.4 GHz
Temperature measurement
0 ~ 200℃ Data transmission distance in air 10m ~15m
Data output
RS232c, RS485, RS422, Ethernet

Examples of Use

Fields of Application

  • Incoming Panel Lead-in and Bus Bars
  • Outdoor Transformer Terminals
  • Bus Duct Bus Bars
  • Underground Cable
  • Cable Trays
  • Aerial Transmission Lines