My 5yr old is afraid of smoke detectors

She's been afraid of them for at least a year now. She has one in her room of course and I've talked to her about how they are there to protect you. She says she's afraid it will "smell" her and then go off. I tried to show her some videos to explain how smoke travels through the detector to a sensor that then sets off the alarm. She was really enthralled with it. We've printed lots of coloring pages (she asked for) that have little cartoons on them talking about smoke detectors and what they're for and how to take care of them and she liked those. But, she's still just as afraid.She will still sleep in her room but to the only thing she won't do is change her clothes in her room because of the smoke detector. Also, she will run past them as she stares at them.Anyway, for now it isn't causing serious problems with her (I.e.: not sleeping) even though it's been going on so long. But, I was wondering if any other parents have/had kids with this specific fear and what they did to help ease it? TIA via /r/Parenting http://ift.tt/2x5gHTB