BOLTEK
EFM-100 Atmospheric Electric Field Monitor
Electric Field Mill with Monitoring Software
Boltek EFM-100 Electric Field Monitor
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.
 
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.
The electric charge contained in a thundercloud also generates an electric field. This field can be measured on the ground.
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.
The EFM-100 software has three built-in alarms: High Field, Very High Field, and a Lightning alarm. Both the the High Field and Very High Field alarms activate if the electric field magnitude rises above a preset level (user configurable). For example: 1 kV/m for High Field alarm and 5 kV/m for the Very High Field alarm.
 
The display turns red when the Very High Field alarm is active.
The software plays a user selectable WAV file when an alarm activates. The WAV file messages will repeat at a predefined frequency (user-configurable)
 
The display turns yellow when the High Field Alarm is active.
 
Once the field returns to normal the display will return to green.
The Lightning Alarm is activated if a sudden electric field change is detected.  Distance is indicated in the distance target.  Target distances are fully configurable between 3 to 24 miles or 5 to 38 km.

Lightning distances and alarm statuses are announced over your computer speakers.
Up to four field mills can be monitored. The field mills can be connected to the computer directly (fiber optic cable to USB/RS232) or remotely over a network (intranet or internet)
Click Here for detailed specifications on the EFM-100. 
Click Here to download the EFM-100 User Manual (Requires Adobe Reader)  
Click Here for photos of EFM-100 installations.
Boltek EFM-100 software supports remote network connected field mills.  Download our EFM software and connect to our demo field mill operating near Buffalo.   Click Here for details.
ADVISORY USE ONLY
The EFM-100 does not have self-test or fault detection circuitry and is not intended or recommended as a primary means of detecting threatening lightning. 
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EFM-100 Atmospheric Electric Field Monitor Packages:

EFM100-120V-100FT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1999.00
Includes EFM-100 Electric Field Mill, 100 feet (30m) of Power Cable, 100 feet (30m) of Fiber Optic Data cable, 120VAC Power Supply, EFA-20 Fiber Optic Receiver, USB Cable, EFA-10 Fiber Optic Receiver, RS232 Cable, EPM-1 Power Module, Windows Software, and Manual.

EFM100-120V-150FT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2099.00

Includes EFM-100 Electric Field Mill, 150 feet (45m) of Power Cable, 150 feet (45m) of Fiber Optic Data cable, 120VAC Power Supply, EFA-20 Fiber Optic Receiver, USB Cable, EFA-10 Fiber Optic Receiver, RS232 Cable, EPM-1 Power Module, Windows Software, and Manual.

EFM100-120V-200FT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2199.00
Includes EFM-100 Electric Field Mill, 200 feet (60m) of Power Cable, 200 feet (60m) of Fiber Optic Data cable, 120VAC Power Supply, EFA-20 Fiber Optic Receiver, USB Cable, EFA-10 Fiber Optic Receiver, RS232 Cable, EPM-1 Power Module, Windows Software, and Manual.

EFM100-220V-100FT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1999.00
Includes EFM-100 Electric Field Mill, 100 feet (30m) of Power Cable, 100 feet (30m) of Fiber Optic Data cable,
220VAC Power Supply, EFA-20 Fiber Optic Receiver, USB Cable, EFA-10 Fiber Optic Receiver, RS232 Cable, EPM-1 Power Module, Windows Software, and Manual. 

EFM100-220V-150FT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2099.00
Includes EFM-100 Electric Field Mill, 150 feet (45m) of Power Cable, 150 feet (45m) of Fiber Optic Data cable,
220VAC Power Supply, EFA-20 Fiber Optic Receiver, USB Cable, EFA-10 Fiber Optic Receiver, RS232 Cable, EPM-1 Power Module, Windows Software, and Manual.

EFM100-220V-200FT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2199.00
Includes EFM-100 Electric Field Mill, 200 feet (60m) of Power Cable, 200 feet (60m) of Fiber Optic Data cable,
220VAC Power Supply, EFA-20 Fiber Optic Receiver, USB Cable, EFA-10 Fiber Optic Receiver, RS232 Cable, EPM-1 Power Module, Windows Software, and Manual.

Questions or Further Info e-mail info@boltek.com
Call (905) 734-8045 or fax (905) 734-9049


Log date, time and distance of nearby lightning.
Monitor lightning up to 24 miles (38 km) away.
Detect the high electric field conditions which precede lightning.
Short-range detector is optimized for close lightning to provide the best distance accuracy while ignoring far away lightning.
Monitor up to four separate locations per PC.
Watch trends develop.
Attention getting alarms.
Review archived data from previous storms.
Stay current with free software updates from the Boltek website.


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LD-350 Lightning Detector
The optional EFM-100 Inverted Mounting Kits let you invert your field mill to reduce precipitation noise, the noise that can appear on your data when heavy rain strikes the sense plates.  Your field mill will work the same way in either orientation.  See the Accessories page to order.
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Optional ERL-10 Relay Output Module provides up to 3 lightning and/or high field alarm outputs for the EFM-100.   Click here for the ERL-10 Data Sheet.   See Accessories page to order.