ᐅ Reed switch for window alarm systems. How have you approached this?

Created on: 28 Sep 2016 21:00
J
joho78
Hello

I would like to hear your opinion: The question is whether reed switches should be installed at the top or bottom of the window. Our current thinking is to install them at the top. Why?

- The alarm system detects the window as open when it is tilted, which I consider safer

- When no one is home, all windows should be closed anyway (i.e., not tilted), so I want to be able to detect this window position

- Due to the mechanical ventilation system, most windows remain closed even at night

- If someone (e.g., our son) wants to sleep with an open window despite the ventilation system, I assume that this can be manually excluded from the alarm system, allowing the system to still be armed at night

- I also assume that certain windows (e.g., bedrooms, children’s rooms) can be permanently excluded from monitoring until further notice. It should notify me that the window is open, but still allow the system to be armed

Additional note: I do not want to install two contacts per window or position the magnet on the locking mechanism.

How have you solved this?

Best regards
J
joho78
29 Sep 2016 16:19
ypg schrieb:
And where do you see the point of excluding tilted windows from the monitoring?
You yourself noted that this almost never happens, and if it does, it’s intentional and brief. You would then only be monitoring the ventilation itself, but not the intended intrusion.


That’s true. I just want to have the flexibility. Most likely, I won’t exclude any window permanently but only on a case-by-case basis. I also have to say that I enjoy programming, and I don’t think it would be too complicated to activate or deactivate the reed switch via the alarm system interface.
sirhc schrieb:
I always thought window monitoring is done by a “loop” that triggers the alarm if it’s interrupted. How can individual windows be excluded?

We get Winkhaus HighControl alarm contacts.

Apparently it is possible, according to my electrician (whether it makes sense is another question).

Relevant for me: Our son wants to sleep with a tilted window open in midsummer. So I see when his window is tilted during activation, but I still arm the system.
G
Gartenfreund
30 Sep 2016 06:30
sirhc schrieb:
I always thought window monitoring was done with a "loop" that triggers the alarm if interrupted. How can individual windows be excluded?

If you run a separate wire from each contact to the control panel and install a small piece of electronics for each contact there, you can use a switch to simulate that the door or window is closed even if it is open. This is not possible with a loop circuit.

As I mentioned before, this is how I implemented it in our system. Additionally, three LEDs in different colors were installed for each contact, so you can immediately see which door or window is open enough to trigger the contact, which contact has been excluded from monitoring, and in the event of an alarm, which contact triggered it. This visual alarm information remains even after the alarm time has expired and must be manually cleared.

So it is possible to exclude individual parts from monitoring—it just requires a bit more effort.
J
joho78
30 Sep 2016 07:25
Thank you for the information. I will also coordinate this with my electrician. However, I hope that the KNX control system will also offer "configuration options" (visualization probably with Loxone).
Weimy1 Oct 2016 10:10
Hello,
in our case, the alarm system can only be armed when all the windows are closed. Of course, we could exclude individual ones, but that is not planned at the moment.
The purpose of this feature is to ensure that when everyone leaves the house in the morning, all windows are monitored.
Our garage is also secured. In addition, we have a four-legged alarm system!
Mycraft1 Oct 2016 12:35
Since you will have KNX, all options are open to you. So why not have two switches per window?

Otherwise, just one at the bottom...
J
joho78
2 Oct 2016 11:26
Weimy schrieb:
Hello,
in our case, the alarm system can only be armed if all windows are closed. Of course, we could exclude some individually, but that is not planned for now.
The purpose of this feature is that when everyone leaves the house in the morning, all windows are monitored.

I am planning it exactly the same way, as this is the only way to ensure proper security, and because of the mechanical ventilation with heat recovery, no window needs to be open anyway. However, at night, I want the flexibility for someone to sleep with a window open if they want. How have you handled arming the system at night when all windows are included? Regards