I’m thinking about replacing my current cistern alarm with something that works through UniFi, mainly so I can get phone alerts and silence the alarm from my phone instead of having to physically go down and press the button.
The current setup uses a simple float switch. The alarm sends around 9 to 10V DC through the float, and the float just opens/closes the circuit depending on the water level. I’m thinking the UniFi relay might work for this.
I was also looking at the SuperLink siren, the non-PoE version, but I’m not sure if its signal input can be triggered by a passive dry-contact float switch. The diagram shows a fire relay, but the docs don’t give much detail beyond that. I asked Ubiquiti chat, but they said they don’t know whether the siren can work directly with a float switch or not.