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No body can help me?
What Can I try?

I have a SC9000 station, when I register MS90 (I bought also another one), after a while, when it detects a movement, on the station TAMPER alarm appears and I'm not able to clear it, if I don't clear the zone itself.
What can I do?
Where I'm wrong?
Thanks

And which cheaper brand and model can I buy?

And do you think is possible to use also sensors of other brands? Or I'm obliged only to use ms90?

I bought a second hand control alarm unit Sc9000 plus PIR four sensors, two ms13 and two ms90. Ms13 sensors doesn't register in control unit when I set it up using install area of menu. One ms90 is working perfectly, one is working but only in repetitive detection mode, even if I change the selector...