I would like to ask the forum for a recommendation of a sensor.
I have a fire suppression sprinkler system in my home (don't get me started ranting on why my town's building code requires it

). The controller has a 110V cable connection to an exterior alarm. I would like to have my Vera Secure controller be able to trigger scenes when (a) that alarm has been triggered (b) the alarm has stopped. I would prefer to not do this with a device that senses the sound or light of the alarm, as I don't want to have to climb a ladder for battery replacement etc.
Is there a sensor device that can be connected to the circuit between sprinkler controller and its alarm box that will raise an event to Vera when current flows in the circuit between the sprinkler controller and the alarm box? I have access to the junction box, so I can either connect to the wires of the circuit or sense current flowing through the cable sheath.
Pretty sure I can hack this by dismantling an inexpensive current detector (the electrician's tool that lights an LED when you hold it over a hot cable) to control a relay connected into some other sensor, but thought I would check to see if there's a commercial device, or if others already have a hack for a similar problem.
Maybe relevant, the Vera and sprinkler controllers are in the same closet so a wired solution is an option.
I'm going to need something that's highly reliable, as this will ultimately result in the fire department being called to the property.
Thanks in anticipation!