Chirping in Kitchen - Always one minute apart
Even though you do not have a smoke alarm in the kitchen I would suggest that you check for low battery condition in all of your smoke alarms in the home. If you have not done so in more than a year the general advice is to replace all the smoke alarm batteries with fresh new ones.

I had the chirp problem at my house and can attest to the fact that it can be difficult to locate the source of the chirp. I believe that the problem is that the chirp sound is one that easily bounces and echos around the house. In addition I have found that the sound duration is so short that our brain has difficulty performing the triangulation that it normally uses to find the source of sounds.