Which smoke alarm has a relay contact to connect to a GSM dialer?
There are two main options: For mains powered, any Ei140 or 160 series alarm can be mounted on an Ei128R or Ei128RBU relay base. This will then give a switched output from the volt-free relay contacts whenever the alarm is triggered. For low-voltage, the Ei100R, 105R, Ei181, Ei186 can be used. All of these units have a built-in set of volt-free relay contacts to again give a switched output. As to the type of sensor to install, cables, plastics etc. tend to give off very thick smoke – which the optical sensor is more suited. However, if the unit is unlikely to be maintained regularly, it may be beneficial to install an ionisation type as the optical type can be more prone to false alarm from contamination.
