Sensor for natural gas

[MikeMelga]

Hi.

I need a natural gas leak sensor (to connect to a binary input) - ceiling install.
I have looked and looked... but found nothing. Any suggestion?

Thanks.

[kropfm]

User 'Redstar' uses Indexa GA 133, maybe you want to talk to him. It senses natural gas, Erdgas, if mounted near ceiling.

Elektro-und-mehr | Elektromaterial Gira Merten Busch Jaeger Jung Siemens Berker - INDEXA Gasmelder 12 V DC GA 133

https://knx-user-forum.de/knx-eib-fo...sor-eib-2.html

[MikeMelga]

Hi kropfm,

Thanks again for your response.
From what I've read in the post you mentioned the options are:

-Indexa GA 80: looks ugly as hell, needs external power (either 230 or 12v)
-ABB gas sensor: was mentioned but I didn't find any info
-Honeywell (ex-Novar, ex-EffEff): also didn't find any info
-Jablotron GS-133: looks decente, also needs external power


So, I already have two options
My ideal was something similar to a smoke detector which could be powered up by a 9v battery but I guess there isn't any. So... I need to replan my wiring to feed 230 or 12v to the ceiling

Any more options?

Thanks!

[MikeMelga]

Well....found the ABB one:

http://www05.abb.com/global/scot/scot209.nsf/veritydisplay/f8cdfe83d72b05e2c1257855006383f7/$file/4546716_sgl_teknisk_dokumentasjon.pdf

looks exactly what I wanted: powered by the bus, looks decent.

[Tessi]

Attention! This sensor has no KNX interface!
It can be powered by 10 to 30V DC or 24V AC but needs up to 80mA, much to much for the KNX bus.
I don't know, why you can find the key word EIB in the documentation, but in a German one:
http://www.mittermeier-alarm.de/down...htgebunden.pdf
you can find the information, that this sensor shall be used with a
ABB burglar alarm system and can be used stand alone since it has a potential free relay output.

[MikeMelga]

Tessi,

thanks for the warning!
But... correct me if I am wrong: although it has no KNX interface, I can power it via the KNX bus, right? (using the white and yellow connectors)

[kropfm]

not by the KNX bus, but by a separate power supply, SELV, using the two spare wires (yellow and white).

[MikeMelga]

not by the KNX bus, but by a separate power supply, SELV, using the two spare wires (yellow and white).

Exactly! Thanks

[Tessi]

Note: To have the state of this sensor on the bus, you need a KNX interface. Either you mount that close to the sensor - that may look ugly if you can not hide it somewhere, or you need additional 2 lines to connect the relay output to the interface, and red/black and yellow/white are already in use (bus and supply)...

[MikeMelga]

Tessi,

Yes, I know. I already have that covered
Thanks.