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Boltek ERL-10 Lightning Relay Module

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 alarms 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 alarm to activate. This virtually eliminates false alarms 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. Alarm activations are timestamped and logged to disk. Graphical log file viewing software is also included.


  • 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 / 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 alarms
  • Fault output indicates operation of the system
  • Status Monitor software shows current alarm state and minutes:seconds until All Clear
  • USB port for configuration and Status Monitor software
  • Default RS-485 input data connection between ERL-10 and EFM-100 short range lightning sensor
  • Optional fiber optic input / RS-485 output for transmitting status messages to other equipment or to a distant Status Monitor computer

Parts Included:

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

ERL-10 Product Brochure
ERL-10 User Manual


ERL-10 V1.30 Software for Windows

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