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Alarm Indication
An Alarm Indication occurs when a near lightning strike or high electric field is detected. Near lightning
strikes are defined as those being within a radius of approximately 8 to 10km of the sensor and could
be close enough to pose a significant risk within approximately 10-15. minutes. High electric field events
are defined as being when the local electric field rises above 7.kV/m. An Alarm status provides to the
user an indication that current activities at site should be suspended and shelter taken in accordance
with established safety procedures.
Document 36 II LWS-MKIII, pub V5 © Copyright 2012 LPI
8 -10 km
LPI
Sensor
Assembly
• LWS activates alarm when
lightning is within 8 -10 km
• Storm 10 -15 minutes away
• External alarm (siren) sounds
warning of impending danger
Alarm Status
Established
storm front
Page 7
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