After commissioning to guide the part was totally leak at all possible connections. Only after several attempts to bring in different places a seal by Teflon tape, the part was quite tight. I suspect here an insufficient precision of the sealing surfaces as a cause, because the rubber seals seemed ok. It is striking that the spray is much too high steered. This is not significantly changed by changing the setting. In fact, I had to observe also, like a cat at a distance of 3 meters (with sensor-range setting about 70%) calmly along in front of the unit marched without the device triggered. Now that the last "proof" part but then also started to organize non-stop nuisance tripping in the sunshine, I've taken all out of order. Conclusion: ok idea, execution absolutely baked
