Eleks brand EHD-A ( 58° ),  EHD-B ( 82° ) and ERD conventional rate-of-rise & fixed temperature Heat Detectors are designed to be sensitive to 58° , 82° and rate-of-rise temperature by the use of advanced thermistor technology.

This detector type triggers when predetermined temperature is reached or sudden temperature increase occured and usualy preferred  for such enviroments that no smoke detectos can be used. Efire EHD and ERD Series Heat Detectors are manufactured in accordance with EN54-7 standards.