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Measuring the static electric field generated by thunderclouds the Boltek EFM-100 not only detects nearby lightning but can detect the atmospheric conditions which precede lightning.

Electric field data is displayed and graphed on your desktop computer using the included software.

For complete electrical isolation from the field mill outside, the EFM-100 connects to your computer using a fiber optic cable.

The EFM-100 features aluminum and stainless steel construction for corrosion resistance,

gold plated connectors throughout, and the highest quality ball-bearing brushless dc motor for excellent reliability.

The electric charge contained in a thundercloud also generates an electric field. This field can be measured on the ground.

Electric fields develop wherever there is a difference in electric potential.

If the electric field gets high enough you can feel your hair stand on end (if this happens outdoors during a thunderstorm crouch down with your feet together as you are about to be struck by lightning.) An electric field is what attracts your hair to a charged comb or a charged balloon.

Electric field is measured in Volts per meter (3.3 feet) The electric fields which accompany thunderstorms normally measure in the thousands of Volts per meter, usually abbreviated to kV/m.

Lightning is detected as a sudden change in the static electric field.


High accuracy lightning detection

 Monitors and alerts for weather conditions that precede lightning

 Standard RS485 data output with optional fiber optic package

 Electrical isolation from the field mill to PC or Laptop

 Customizable alarm distances and electric field levels

 SMS text messaging and E-mail alarm notifications

 Monitor up to four separate locations per computer

 Inverted Mounting Kit greatly reduces the number of false alarms    during heavy precipitation

 Aluminum and stainless steel parts throughout for corrosion    resistance

Free software updates

• One year parts & labor manufacturers warranty

Parts Included

EFM-100 Electric Field Mill

100 feet (30m) of Power/Data Cat5 Cable

120/220V AC Power Supply

EFA-21 Power / RS485 to USB Module

USB Cable

DIN rail clip for EFA-21 module

6 Attenuator Plugs

• Windows Software & Manual

Inverted Mounting Kit:

Inverted mounting mast*, shroud,   Inverted EFM-100 cover, Junction box,   Silicone grease, and a Pole Mount Bracket   or Tripod

Optional fiber optic package includes fiber   optic cable, EFA-20 with USB cable, and   EFA-10 with DB9 serial cable

*Custom mounting masts available

Boltek EFM-100C Electric Field Mill Brochure

Boltek LD-350 Lightning Detector Brochure

EFM-100C RS485 Electric Field Mill


 With this cellular modem you simply connect the antenna, insert your cell carriers sim  card and connect it to an available USB or Serial COM port on your PC or laptop.

 Once configured with your PC or Laptop, the EFM-100 will see the modem as an  option to send SMS text alerts when a high electrical field is incoming, or when a          

 lightning strike is detected within 0 to 24 miles.

All Clear messages will also be transmitted if enabled in the software when storms start to recede and move away from local area.


   Communicates with EFM-100 software to send out SMS text message alerts

 •  Compatible with most cellular carriers

 •  Ideal for remote or unmanned stations

 •  Quick and easy installation

 •  Quad band modem for world-wide operation

 • One year parts & labor manufacturers warranty

Parts Included


  • GSM/GPRS Modem (850/900/1800/1900 MHz)

  • 100-240VAC Universal Power Supply

  • Miniature Antenna

    High-Gain magnetic mount antenna with 10 feet (3m) of cable     DB9  

  • serial cable USB-RS232 adapter

Boltek GSM/GPRS Modem Package


The ERL-10 receives data from the EFM-100 Electric Field Mill short-range sensor (<20 miles/32 km). It constantly monitors for lightning and activates its timed relay outputs when lightning is detected. Up to two alarms can be configured, referred to as Red, and Yellow Alert levels. The green All Clear state is entered when no lightning has been detected within the configured time period.
When the ERL-10 is first turned on, it enters Survey Mode where it looks for lightning. After several minutes without lightning (configurable but typically 10-20 minutes) the system enters the All Clear state. The green All Clear light on the ERL-10 illuminates and the All Clear relay output activates.


• 1, 2 or 3 alarms levels (Red, Red/Yellow, Red/Orange/Yellow)
• All Clear output (Green)
• Fully configurable alarm distances, durations and high electric field levels
• 20 miles / 37 km range
• High electric field alarm warns of conditions where first strike is more likely to    occur
• Fault output indicates status of the system
• Status Monitor software shows current alarm state and minutes:seconds

   until All Clear
• USB port for configuration and/or Status Monitor software
• Optional fiber optic connection between sensor and ERL-10 for remote    mounted EFM-100 sensor


• Free software updates

• One year parts & labor manufacturers warranty

Parts Included

   • ERL-10 Output Relay Module
• A/B USB Cable
• RS485 Cable (3 Wire)
• 120/220V AC Power Adapter
• 2 x DIN Rail Clips with Screws
• Status Monitor software for Windows

Boltek ERL10-KIT1 RS485 Lightning Alarm Brochure

Boltek LD-350 Lightning Detector Brochure

ERL10-KIT1 RS485 Lightning Alarm Package

ERL-10 V1.30 Software for Windows

Boltek Short Range Lightning Detector

Boltek GSM/GPRS Modem

Boltek LD-350 Lightning Detector Brochure