Hello All, Odd question for a Sunday afternoon but does anyone know what voltage the interlink signal runs at on Fire Angel Mains smoke/heat alarms. We are wanting to take the signal into an automation system and need to know what voltage it is.
Good question, you use a 3 core & earth cable on the heat & smoke alarms, & your limited to 250mtr connecting wire per circuit, but I can't recall the interconnect voltage.
Plenty of meterage for the cabling, we just need to work out if we can directly take the signal into our system or if we need to step it down using a coupling relay etc.
I would recommend using AICO smokes and adding an AICO relay base to just one alarm - This provides a pair of volt free contacts on alarm. I don't think the FireAngel range have a relay base available. The interlink voltage is extra low voltage as it must interlink during a mains failure.
Very good point! The issue is that we didn't have a say in the smokes going in and now trying to work out the way around this.
The fire angel wst 630 battery smoke alarm can be I interlinked but like already said Aico only decent smoke alarm to install
I appreciate that and will note it for future installs, the issue we have is that Fire Angel mains interlinked smokes are already being installed in this project. So we are in need of finding out how we can get a voltage signal from the Fire Angel smokes.
Just fitted a pair of the Aico Ei2110e Multi Sensor (has both an optical and heat sensor) alarms here. https://www.aico.co.uk/product/ei2110e-multi-sensor-fire-alarm/
They've got a 9v battery to work as backup. There'll be an approx 9v difference (a shade less) applied to the neutral of the interconnect in event of 240v drop out. Which is what will be detected. Or so common sense dictates.
I don't think it's as simple as saying "it's a 9v battery, the signal will be 9v". It is definitely referenced to neutral, as reversing polarity kills the alarms.
The standby battery is 9V, so when the mains are lost the alarm will still work and commutate with the others on the circuit. My guess is that the coms voltage is around 9V, but at a very low current. I would set an alarm up and test the com's wire voltage to neutral. A suitable relay can be found on E Bay in the Arduino shield section. This is a 5v relay with optical isolation and an interface, to trigger it requires only a few milliamps. I am using one at present as a water level alarm running on a 12 volt supply, it's been Ok for more than a year. Cost between £2 and £8 depending on how many relays you want on a board.
I would have thought that the Interlink wire is a telemetary connection that provides (vendor specific) chat between the connected alarms. It doubt that it is a hard on/off signal. You best bet is tro call Fire Angel http://www.fireangel.co.uk/support/technical-support
Concur - It is not just an on/off signal. It includes mute/hush etc. I doubt you can simply hook a relay up to the interlink and neutral.
Interlink voltage on BRK/ Kidde & Firex is 9v; you shouldn't consider tapping directly off the interlink strand, but use a relay pattress as others have indicated. https://www.tlc-direct.co.uk/Products/KDSMK23R.html
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