Two DT Sensors in one room

[Guest cdyckes]

I want to fit two sensors to maximise coverage of a largish lounge. I've got the Texecom Mirage DT sensors which have PIR and uWave and wonder if anyone has experience of doing this and is it is wise to use two uWave sensors in the same room (do they interfere even if the uWave sensitivity is reduced, and so would it make sense for the second sensor to be PIR only?).

Following from this, do you get back-scatter from the uWave transmiitter? If so would this cause a problem if two such devices were effectively back-to-back on opposite sides of the same wall covering two seperate rooms.

Hopefully this is the last of the newbie questions for now

Colin

[Service Engineer]

Your asking some sensible questions for a newbie

Firstly 2 detectors of the same type should not be allowed to cover the same area. You could just use the PIR in the 2nd sensor but it seems a waste of a Dual Tech to me.

There is some back scatter from the microwave but it should not cause problems when devices are back to back.

[Guest]

you also need to make sure they are different freq' or you will get cross talk which makes the mw unstable and liable to fa's

[Guest cdyckes]

Thanks.

I'll go for a Prestige MR PIR as the second sensor in the room.

Can't change the uWave frequency so will have to see if any interference problems exist when I've installed the system. Polar diagram shows no back-scatter but I'd be amazed if that was true.

Colin

[breff]

Dont fit dualtecs back to back, the mw pattern can go up to a meter behind the sensor and they will interfere with each other.

[Chris Teague]

A previous firm I used to work for had a lot of problems with the C100 DT (Napco I think) whereby back to back, they hardly picked up movement at all. They ended up re-locating some of them.