I have travelled through Manchester, Amsterdam, Oslo, and Kirkenes, with my libre on, but as I also have various metal implants in my arm and elbow I don't know if it was the libre or them that set the detector off.
I explained what it was (it was covered in rocktape so they couldn't even see it, but nobody seemed bothered. I doubt they are specifically made aware of the libre system, but they should treat it the same an an insulin pump i.e should not be asked to remove it, but may need to be swabbed.
Worst case scenario I can foresee would be a case of having to explain what it is and having it swabbed for explosives. You can always make sure you handset is close to hand and show them how it works.
As the libre casing is plastic and the only metal is the small battery ( just a watch battery) and a small amount on the PCB you may find it won't even set of the detector.
I can certainly attest to the fact that the metal detectors and x rays have no effect on them.
Last edited by caryh; 6th Sep 2016 at 21:29.
Reason: spelling correction