Cheap device to wire interconnected smokes to alarm

Kidde SM120X Smoke Relay. It's about $7, and hooks into your existing interconnects. The GE 350cx that people are using is $40-50.

http://www.1000bulbs.com/Smoke-Detectors/38512/

BRK also makes one called the RM4. I ordered that one since I already have all BRK detectors. Supposedly the Kidde and BRK ones are interchangeable with each other.

This is a good find!

That is indeed a good find. Does anyone know whether the interconnect signal is standard across smoke detector brands?

Zac said:

That is indeed a good find. Does anyone know whether the interconnect signal is standard across smoke detector brands?

Click to expand...

Exactly what i'm tryin to find out as well...I have no idea. I have a smoke sensor in my basement not too far from the alarm panel, so this would be a piece of cake if it worked with my sensors...

I think I have FirtAlert's, hardwired with battery backup and interconnected.

Some are both smoke and CO, does that mean they trigger the interconnect on either case?

Maybe some of us can measure the voltage across the interconnects and post our brand and value...if they're all the same then we can draw our own conclusions.

MavRic said:

Zac said:

That is indeed a good find. Does anyone know whether the interconnect signal is standard across smoke detector brands?

Click to expand...

Exactly what i'm tryin to find out as well...I have no idea. I have a smoke sensor in my basement not too far from the alarm panel, so this would be a piece of cake if it worked with my sensors...

I think I have FirtAlert's, hardwired with battery backup and interconnected.

Some are both smoke and CO, does that mean they trigger the interconnect on either case?

Maybe some of us can measure the voltage across the interconnects and post our brand and value...if they're all the same then we can draw our own conclusions.

Click to expand...

Kidde and BRK use something like 9 volts over the interconnect. It goes constant voltage for smokes, and intermittent voltage for CO alarms. I don't know how you would differentiate between CO and Smoke within the ELK. You could probably use a whenever rule, put the zone on fast loop, and say when it becomes insecure for a number of seconds, it's a fire. And do another rule to say if it becomes insecure a number of times within a number of seconds, then it's a CO alarm (should be able to do this with some fancy rule writing).

I think BRK and First Alert might be the same company, or make detectors for each other. I've seen smokes branded BRK First Alert before.