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Programmable Relay module with fiber optic input designed for use with the EFM-100

ERL-10-F Lightning Relay Module

ERL-10-F Lightning Relay Module


1, 2 or 3 alert levels (Red, Red/Yellow, Red/Orange/Yellow)
All Clear output (Green)
Fully configurable alert distances, durations and high electric field levels
20 miles / 32 km range
Available High electric field alert warns of conditions when first strike is more likely to occur
Dual Sensor Coincidence Mode virtually eliminates false alert
Fault output indicates operation of the system
Status Monitor software shows current alert state and minutes:seconds until All Clear
USB port for configuration and Status Monitor software
Fiber optic data connection between ERL-10-F and EFM-100 short range lightning sensor
USB and RS-485 output for transmitting status messages directly to a computer or other equipment



The ERL-10 receives data from the EFM-100 Electric Field Mill short-range sensor (<20 miles/32 km) and a LD-250 long range lightning detector. It constantly monitors for lightning and activates its timed relay outputs when lightning is detected. Up to three alerts can be configured, referred to as Red, Orange, 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.


Coincidence Mode

With Coincidence Mode enabled, a lightning strike must be detected by both the EFM-100 and the LD-250 in order for an alert to activate. This virtually eliminates false alerts that could be caused by persons, animals, insects, etc. near the EFM-100 sensor. Coincidence Mode is only applicable within the range of the EFM-100 (0-20miles/0-32km).


Status Monitor

The ERL-10 Status Monitor software (included) allows the system status and countdown timers to be displayed. Countdown timers clearly indicate the number of minutes until All Clear. Alert activations are timestamped and logged to disk. Graphical log file viewing software is also included.



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ERL-10 Product Brochure
ERL-10 User Manual

Parts Included

ERL-10-F EFM Relay Output Module with Fiber optic input
12V DC Power Adapter
USB Cable
3-Wire RS485 Cable
Boltek USB Flash Drive
DIN Rail Clip
Rubber Feet



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