Post by Russel on Jun 22, 2017 13:44:19 GMT 8
You can pretty much buy any 433Mhz smoke or co2 unit and bind it with your Kerui alarm.
Smoke detectors
Using infra red the units pulse the IR light around inside the unit where there is also a pickup IR light sensor when smoke is in the room it rises up and enters the smoke alarm blocking out the IR light, the pickup IR light sensor doesn't receive a light signal because the smoke has blocked out the light and the unit triggers.
Co2 detectors (NDIR)
A basic how they work is by using infra red light that is shining at a sensor. Air in the room passes in between the IR beam and the sensor pickup Co2 gas absorbs some the light if there is too much IR light absorbed the sensor triggers.
Reference - co2meter.com
APP TIP:
In the zone settings on the phone app you will see that you can set a zone type as 'emergency'. What this means is that it doesn't matter if your alarm unit is armed or disarmed if one of the detectors in this zone triggers the alarm will go off. So with that logic in mind you want to connect devices like smoke, co2, water level detector unit to a single zone and make the type 'emergency'.
PURCHASING TIPS:
1. Does the alarm make a PIP noise when the battery is low, remember these alarms are crucial to your life if the batteries run out and you don't know and a fire starts when you are asleep chances are you will probably not wake up. Battery low warning PIP is pretty important.
2. Probably harder to find mains powered units on the (ebay) market. Mains powered units are the first line of defense as batteries can be unreliable (especially if there is no PIP noise on low battery).
3. If you know a little bit of DIY electronics you could probably make you own mains power (eg 9v power pack supply) and buy a battery low warning beeper off ebay for less than $3 and connect it to each unit.
If anyone has any tips they would like to recommend about these types of units please share below.
Smoke detectors
Using infra red the units pulse the IR light around inside the unit where there is also a pickup IR light sensor when smoke is in the room it rises up and enters the smoke alarm blocking out the IR light, the pickup IR light sensor doesn't receive a light signal because the smoke has blocked out the light and the unit triggers.
Co2 detectors (NDIR)
A basic how they work is by using infra red light that is shining at a sensor. Air in the room passes in between the IR beam and the sensor pickup Co2 gas absorbs some the light if there is too much IR light absorbed the sensor triggers.
Reference - co2meter.com
APP TIP:
In the zone settings on the phone app you will see that you can set a zone type as 'emergency'. What this means is that it doesn't matter if your alarm unit is armed or disarmed if one of the detectors in this zone triggers the alarm will go off. So with that logic in mind you want to connect devices like smoke, co2, water level detector unit to a single zone and make the type 'emergency'.
PURCHASING TIPS:
1. Does the alarm make a PIP noise when the battery is low, remember these alarms are crucial to your life if the batteries run out and you don't know and a fire starts when you are asleep chances are you will probably not wake up. Battery low warning PIP is pretty important.
2. Probably harder to find mains powered units on the (ebay) market. Mains powered units are the first line of defense as batteries can be unreliable (especially if there is no PIP noise on low battery).
3. If you know a little bit of DIY electronics you could probably make you own mains power (eg 9v power pack supply) and buy a battery low warning beeper off ebay for less than $3 and connect it to each unit.
If anyone has any tips they would like to recommend about these types of units please share below.